1
90067814fb
LTM9008-14/
LTM9007-14/LTM9006-14
For more information www.linear.com/LTM9008-14
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
14-Bit, 65Msps/40Msps/
25Msps Low Power Octal ADCs
LTM9008-14, 65Msps,
2-Tone FFT, fIN = 70MHz and 75MHz
The LTM
®
9008-14/LTM9007-14/LTM9006-14 are 8-chan-
nel, simultaneous sampling 14-bit A/D converters designed
for digitizing high frequency, wide dynamic range signals.
AC performance includes 73dB SNR and 90dB spurious
free dynamic range (SFDR). Low power consumption per
channel reduces heat in high channel count applications.
Integrated bypass capacitance and flowthrough pinout
reduces overall board space requirements.
DC specs include ±1LSB INL (typ), ±0.3LSB DNL (typ)
and no missing codes over temperature. The transition
noise is a low 1.2LSBRMS.
The digital outputs are serial LVDS to minimize the num-
ber of data lines. Each channel outputs two bits at a time
(2-lane mode). At lower sampling rates there is a one bit
per channel option (1-lane mode).
The ENC+ and ENC– inputs may be driven differentially
or single-ended with a sine wave, PECL, LVDS, TTL, or
CMOS inputs. An internal clock duty cycle stabilizer al-
lows high performance at full speed for a wide range of
clock duty cycles.
n 8-Channel Simultaneous Sampling ADC
n 73dB SNR
n 90dB SFDR
n Low Power: 88mW/59mW/46mW per Channel
n Single 1.8V Supply
n Serial LVDS Outputs: 1 or 2 Bits per Channel
n Selectable Input Ranges: 1VP-P to 2VP-P
n 800MHz Full Power Bandwidth S/H
n Shutdown and Nap Modes
n Serial SPI Port for Configuration
n Internal Bypass Capacitance, No External
Components
n 140-Pin (11.25mm × 9mm) BGA Package
n Communications
n Cellular Base Stations
n Software Defined Radios
n Portable Medical Imaging
n Multichannel Data Acquisition
n Nondestructive Testing
L, LT, LT C , LT M, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
DATA
SERIALIZER
ENCODE
INPUT
SERIALIZED
LVDS
OUTPUTS
1.8V
VDD
1.8V
OVDD
OUT1A
OUT1B
OUT2A
OUT2B
OUT8A
OUT8B
DATA
CLOCK
OUT
FRAME
GND
GND
90067814 TA01
S/H
CHANNEL 1
ANALOG
INPUT
14-BIT
ADC CORE
S/H
CHANNEL 2
ANALOG
INPUT
14-BIT
ADC CORE
S/H
CHANNEL 8
ANALOG
INPUT
14-BIT
ADC CORE
PLL
• • •
• • •
• • •
• • •
FREQUENCY (MHz)
0
–100
–110
–120
–70
–60
–80
–90
AMPLITUDE (dBFS)
–50
–30
–40
–20
–10
0
10 20 30
90067814 TA01b
LTM9008-14/
LTM9007-14/LTM9006-14
2
90067814fb
For more information www.linear.com/LTM9008-14
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TRAY PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTM9008CY-14#PBF LTM9008CY-14#PBF LTM9008Y14 140-Lead (11.25mm × 9mm × 2.72mm) BGA 0°C to 70°C
LTM9008IY-14#PBF LTM9008IY-14#PBF LTM9008Y14 140-Lead (11.25mm × 9mm × 2.72mm) BGA –40°C to 85°C
LTM9007CY-14#PBF LTM9007CY-14#PBF LTM9007Y14 140-Lead (11.25mm × 9mm × 2.72mm) BGA 0°C to 70°C
LTM9007IY-14#PBF LTM9007IY-14#PBF LTM9007Y14 140-Lead (11.25mm × 9mm × 2.72mm) BGA –40°C to 85°C
LTM9006CY-14#PBF LTM9006CY-14#PBF LTM9006Y14 140-Lead (11.25mm × 9mm × 2.72mm) BGA 0°C to 70°C
LTM9006IY-14#PBF LTM9006IY-14#PBF LTM9006Y14 140-Lead (11.25mm × 9mm × 2.72mm) BGA –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
Supply Voltages
VDD, OVDD ................................................ –0.3V to 2V
Analog Input Voltage (AIN+, AIN–,
PAR/SER, SENSE) (Note 3) .......... –0.3V to (VDD + 0.2V)
Digital Input Voltage (ENC+, ENC–, CS,
SDI, SCK) (Note 4) .................................... –0.3V to 3.9V
SDO (Note 4) ............................................. –0.3V to 3.9V
Digital Output Voltage ................ –0.3V to (OVDD + 0.3V)
Operating Temperature Range
LTM9008C, LTM9007C, LTM9006C......... 0°C to 70°C
LTM9008I, LTM9007I, LTM9006I ........–40°C to 85°C
Storage Temperature Range .................. –55°C to 125°C
1
P
C
D
E
F
G
H
J
K
L
M
N
A
B
1098765432
BGA PACKAGE
140-LEAD (11.25mm × 9.00mm × 2.72mm)
TOP VIEW
TJMAX = 150°C, θJA = 30°C/W, θJC = 25°C/W, θJB = 15°C/W, θJCbottom = 12°C/W
http://www.linear.com/product/LTM9008-14#orderinfo
3
90067814fb
LTM9008-14/
LTM9007-14/LTM9006-14
For more information www.linear.com/LTM9008-14
CONVERTER CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 5)
PARAMETER CONDITIONS
LTM9008-14 LTM9007-14 LTM9006-14
UNITSMIN TYP MAX MIN TYP MAX MIN TYP MAX
Resolution (No Missing Codes) l14 14 14 Bits
Integral Linearity Error Differential Analog Input (Note 6) l–4.1 ±1.2 4.1 –2.75 ±1 2.75 –2.75 ±1 2.75 LSB
Differential Linearity Error Differential Analog Input l–0.9 ±0.3 0.9 –0.8 ±0.3 0.8 –0.8 ±0.3 0.8 LSB
Offset Error (Note 7) l–12 ±3 12 –12 ±3 12 –12 ±3 12 mV
Gain Error Internal Reference
External Reference
l
–2.5
–1.3
–1.3
0.5
–2.5
–1.3
–1.3
0.5
–2.6
–1.3
–1.3
0.5
%FS
%FS
Offset Drift ±20 ±20 ±20 µV/°C
Full-Scale Drift Internal Reference
External Reference
±35
±25
±35
±25
±35
±25
ppm/°C
ppm/°C
Gain Matching External Reference ±0.2 ±0.2 ±0.2 %FS
Offset Matching ±3 ±3 ±3 mV
T
ransition Noise External Reference 1.2 1.2 1.2 LSBRMS
ANALOG INPUT
The l denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at TA = 25°C. (Note 5)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Analog Input Range (AIN+ – AIN–) 1.7V < VDD < 1.9V l1 to 2 VP-P
VIN(CM) Analog Input Common Mode (AIN+ + AIN–)/2 Differential Analog Input (Note 8) lVCM – 100mV VCM VCM + 100mV V
VSENSE External Voltage Reference Applied to SENSE External Reference Mode l0.625 1.250 1.300 V
IINCM Analog Input Common Mode Current Per Pin, 65Msps
Per Pin, 40Msps
Per Pin, 25Msps
81
50
31
µA
µA
µA
IIN1 Analog Input Leakage Current 0 < AIN+, AIN– < VDD, No Encode l–1 1 µA
IIN2 PAR/SER Input Leakage Current 0 < PAR/SER < VDD l–3 3 µA
IIN3 SENSE Input Leakage Current 0.625 < SENSE < 1.3V l–6 6 µA
tAP Sample-and-Hold Acquisition Delay Time 0 ns
tJITTER Sample-and-Hold Acquisition Delay Jitter 0.15 psRMS
CMRR Analog Input Common Mode Rejection Ratio 80 dB
BW-3B Full-Power Bandwidth Figure 6 Test Circuit 800 MHz
LTM9008-14/
LTM9007-14/LTM9006-14
4
90067814fb
For more information www.linear.com/LTM9008-14
DYNAMIC ACCURACY
The l denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at TA = 25°C. AIN = –1dBFS. (Note 5)
SYMBOL PARAMETER CONDITIONS
LTM9008-14 LTM9007-14 LTM9006-14
UNITSMIN TYP MAX MIN TYP MAX MIN TYP MAX
SNR Signal-to-Noise Ratio 5MHz Input
30MHz Input
70MHz Input
140MHz Input
l
71.8
73.7
73.7
73.5
73
69.6
73.5
73.4
73.4
72.8
69.6
72.9
72.9
72.8
72.3
dBFS
dBFS
dBFS
dBFS
SFDR Spurious Free Dynamic Range
2nd or 3rd Harmonic
5MHz Input
30MHz Input
70MHz Input
140MHz Input
l
74
90
90
89
84
76.8
90
90
89
84
76.8
90
90
89
84
dBFS
dBFS
dBFS
dBFS
Spurious Free Dynamic Range
4th Harmonic or Higher
5MHz Input
30MHz Input
70MHz Input
140MHz Input
l
84
90
90
90
90
84
90
90
90
90
84
90
90
90
90
dBFS
dBFS
dBFS
dBFS
S/(N+D) Signal-to-Noise Plus
Distortion Ratio
5MHz Input
30MHz Input
70MHz Input
140MHz Input
l
71
73.6
73.5
73.2
72.5
69.5
73.3
73.2
73.1
72.3
69.5
72.8
72.7
72.5
71.9
dBFS
dBFS
dBFS
dBFS
Crosstalk, Near Channel 10MHz Input (Note 12) –90 –90 –90 dBc
Crosstalk, Far Channel 10MHz Input (Note 12) –105 –105 –105 dBc
INTERNAL REFERENCE CHARACTERISTICS
The l denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at TA = 25°C. AIN = –1dBFS. (Note 5)
PARAMETER CONDITIONS MIN TYP MAX UNITS
VCM Output Voltage IOUT = 0 0.5 • VDD – 25mV 0.5 • VDD 0.5 • VDD + 25mV V
VCM Output Temperature Drift ±25 ppm/°C
VCM Output Resistance –600µA < IOUT < 1mA 4 Ω
VREF Output Voltage IOUT = 0 1.225 1.250 1.275 V
VREF Output Temperature Drift ±25 ppm/°C
VREF Output Resistance –400µA < IOUT < 1mA 7 Ω
VREF Line Regulation 1.7V < VDD < 1.9V 0.6 mV/V
5
90067814fb
LTM9008-14/
LTM9007-14/LTM9006-14
For more information www.linear.com/LTM9008-14
DIGITAL INPUTS AND OUTPUTS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 5)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
ENCODE INPUTS (ENC+, ENC– )
Differential Encode Mode (ENC– Not Tied to GND)
VID Differential Input Voltage (Note 8) l0.2 V
VICM Common Mode Input Voltage Internally Set
Externally Set (Note 8)
l
1.1
1.2
1.6
V
V
VIN Input Voltage Range ENC+, ENC– to GND l0.2 3.6 V
RIN Input Resistance (See Figure 10) 10 kΩ
CIN Input Capacitance 3.5 pF
Single-Ended Encode Mode (ENC– Tied to GND)
VIH High Level Input Voltage VDD = 1.8V 1.26 V
VIL Low Level Input Voltage VDD = 1.8V 0.54 V
VIN Input Voltage Range ENC+ to GND 0 to 3.6 V
RIN Input Resistance (See Figure 11) 30 kΩ
CIN Input Capacitance 3.5 pF
DIGITAL INPUTS (CS, SDI, SCK in Serial or Parallel Programming Mode. SDO in Parallel Programming Mode)
VIH High Level Input Voltage VDD = 1.8V l1.3 V
VIL Low Level Input Voltage VDD = 1.8V l0.6 V
IIN Input Current VIN = 0V to 3.6V l–10 10 µA
CIN Input Capacitance 3 pF
SDO OUTPUT (Serial Programming Mode. Open-Drain Output. Requires 2kΩ Pull-Up Resistor if SDO Is Used)
ROL Logic Low Output Resistance to GND VDD = 1.8V, SDO = 0V 200 Ω
IOH Logic High Output Leakage Current SDO = 0V to 3.6V l–10 10 µA
COUT Output Capacitance 3 pF
DIGITAL DATA OUTPUTS
VOD Differential Output Voltage 100Ω Differential Load, 3.5mA Mode
100Ω Differential Load, 1.75mA Mode
l
l
247
125
350
175
454
250
mV
mV
VOS Common Mode Output Voltage 100Ω Differential Load, 3.5mA Mode
100Ω Differential Load, 1.75mA Mode
l
l
1.125
1.125
1.250
1.250
1.375
1.375
V
V
RTERM On-Chip Termination Resistance Termination Enabled, OVDD = 1.8V 100 Ω
LTM9008-14/
LTM9007-14/LTM9006-14
6
90067814fb
For more information www.linear.com/LTM9008-14
POWER REQUIREMENTS
The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. (Note 9)
SYMBOL PARAMETER CONDITIONS
LTM9008-14 LTM9007-14 LTM9006-14
UNITSMIN TYP MAX MIN TYP MAX MIN TYP MAX
VDD Analog Supply Voltage (Note 10) l1.7 1.8 1.9 1.7 1.8 1.9 1.7 1.8 1.9 V
OVDD Output Supply Voltage (Note 10) l1.7 1.8 1.9 1.7 1.8 1.9 1.7 1.8 1.9 V
IVDD Analog Supply Current Sine Wave Input l357 400 232 275 175 250 mA
IOVDD Digital Supply Current 1-Lane Mode, 1.75mA Mode
1-Lane Mode, 3.5mA Mode
2-Lane Mode, 1.75mA Mode
2-Lane Mode, 3.5mA Mode
l
l
32
60
50
94
58
104
32
58
48
92
54
102
30
56
48
90
54
100
mA
mA
mA
mA
PDISS Power Dissipation 1-Lane Mode, 1.75mA Mode
1-Lane Mode, 3.5mA Mode
2-Lane Mode, 1.75mA Mode
2-Lane Mode, 3.5mA Mode
l
l
700
751
733
812
824
907
475
522
504
583
592
679
369
416
401
477
547
630
mW
mW
mW
mW
PSLEEP Sleep Mode Power 2 2 2 mW
PNAP Nap Mode Power 170 170 170 mW
PDIFFCLK Power Decrease With Single-Ended Encode Mode Enabled
(No Decrease for Sleep Mode)
40 40 40 mW
TIMING CHARACTERISTICS
The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. (Note 5)
SYMBOL PARAMETER CONDITIONS
LTM9008-14 LTM9007-14 LTM9006-14
UNITSMIN TYP MAX MIN TYP MAX MIN TYP MAX
fSSampling Frequency (Notes 10,11) l5 65 5 40 5 25 MHz
tENCL ENC Low Time (Note 8) Duty Cycle Stabilizer Off
Duty Cycle Stabilizer On
l
l
7.3
2
7.69
7.69
100
100
11.88
2
12.5
12.5
100
100
19
2
20
20
100
100
ns
ns
tENCH ENC High Time (Note 8) Duty Cycle Stabilizer Off
Duty Cycle Stabilizer On
l
l
7.3
2
7.69
7.69
100
100
11.88
2
12.5
12.5
100
100
19
2
20
20
100
100
ns
ns
tAP Sample-and-Hold
Acquisition Delay Time
0 0 0 ns
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Digital Data Outputs (RTERM = 100Ω Differential, CL = 2pF to GND on Each Output)
tSER Serial Data Bit Period 2-Lanes, 16-Bit Serialization
2-Lanes, 14-Bit Serialization
2-Lanes, 12-Bit Serialization
1-Lane, 16-Bit Serialization
1-Lane, 14-Bit Serialization
1-Lane, 12-Bit Serialization
1/(8 • fS)
1/(7 • fS)
1/(6 • fS)
1/(16 • fS)
1/(14 • fS)
1/(12 • fS)
s
s
s
s
s
s
tFRAME FR to DCO Delay (Note 8) l0.35 • tSER 0.5 • tSER 0.65 • tSER s
tDATA DATA to DCO Delay (Note 8) l0.35 • tSER 0.5 • tSER 0.65 • tSER s
tPD Propagation Delay (Note 8) l0.7n + 2 • tSER 1.1n + 2 • tSER 1.5n + 2 • tSER s
tROutput Rise Time Data, DCO, FR, 20% to 80% 0.17 ns
tFOutput Fall Time Data, DCO, FR, 20% to 80% 0.17 ns
DCO Cycle-Cycle Jitter tSER = 1ns 60 psP-P
Pipeline Latency 6 Cycles
7
90067814fb
LTM9008-14/
LTM9007-14/LTM9006-14
For more information www.linear.com/LTM9008-14
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
SPI Port Timing (Note 8)
tSCK SCK Period Write Mode
Read Back Mode, CSDO = 20pF,
RPULLUP = 2k
l
l
40
250
ns
ns
tSCS to SCK Setup Time l5 ns
tHSCK to CS Setup Time l5 ns
tDS SDI Setup Time l5 ns
tDH SDI Hold Time l5 ns
tDO SCK Falling to SDO Valid Read Back Mode, CSDO = 20pF,
RPULLUP = 2k
l125 ns
TIMING CHARACTERISTICS
The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. (Note 5)
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All voltage values are with respect to GND (unless otherwise
noted).
Note 3: When these pin voltages are taken below GND or above VDD, they
will be clamped by internal diodes. This product can handle input currents
of greater than 100mA below GND or above VDD without latchup.
Note 4: When these pin voltages are taken below GND they will be
clamped by internal diodes. When these pin voltages are taken above VDD
they will not be clamped by internal diodes. This product can handle input
currents of greater than 100mA below GND without latchup.
Note 5: V
DD
= OV
DD
= 1.8V, f
SAMPLE
= 65MHz (LTM9008), 40MHz
(LTM9007), or 25MHz (LTM9006), 2-lane output mode, differential ENC+/
ENC– = 2V
P-P
sine wave, input range = 2V
P-P
with differential drive, unless
otherwise noted.
Note 6: Integral nonlinearity is defined as the deviation of a code from a
best fit straight line to the transfer curve. The deviation is measured from
the center of the quantization band.
Note 7: Offset error is the offset voltage measured from –0.5 LSB when
the output code flickers between 00 0000 0000 0000 and 11 1111 1111
1111 in 2’s complement output mode.
Note 8: Guaranteed by design, not subject to test.
Note 9: VDD = OVDD = 1.8V, fSAMPLE = 65MHz (LTM9008), 40MHz
(LTM9007), or 25MHz (LTM9006), 2-lane output mode, differential
ENC+/ENC– = 2VP-P sine wave, input range = 2VP-P with differential
drive, unless otherwise noted. The supply current and power dissipation
specifications are totals for the entire device, not per channel.
Note 10: Recommended operating conditions.
Note 11: The maximum sampling frequency depends on the speed grade
of the part and also which serialization mode is used. The maximum serial
data rate is 1000Mbps so tSER must be greater than or equal to 1ns.
Note 12: Near-channel crosstalk refers to Ch. 1 to Ch.2, and Ch.7 to Ch.8.
Far-channel crosstalk refers to Ch.1 to Ch.7, Ch.1 to Ch.8, Ch.2 to Ch.7, and
Ch.2 to Ch.8.
LTM9008-14/
LTM9007-14/LTM9006-14
8
90067814fb
For more information www.linear.com/LTM9008-14
2-Lane Output Mode, 14-Bit Serialization
TIMING DIAGRAMS
2-Lane Output Mode, 16-Bit Serialization*
ANALOG
INPUT
ENC–
ENC+
DCO–
DCO+
t
AP
tENCH tENCL
tSER
tSER
tSER
tPD
tDATA
tFRAME
SAMPLE N-6
*SEE THE DIGITAL OUTPUTS SECTION
SAMPLE N-5 SAMPLE N-4
N+1
N
90067814 TD01
D5 D3 D1 0 D13 D11 D9 D7 D5 D3 D1 0 D13 D11 D9
OUT#A–
OUT#A+
FR–
FR+
D4 D2 D0 0 D12 D10 D8 D6 D4 D2 D0 0 D12 D10 D8
OUT#B–
OUT#B+
ANALOG
INPUT
ENC–
ENC+
DCO–
DCO+
t
AP
tENCH tENCL
tSER
tSER
tSER
tPD
tDATA
tFRAME
SAMPLE N-6 SAMPLE N-5 SAMPLE N-4 SAMPLE N-3
N+1
N+2
N
90067814 TD02
D7 D5 D3 D1 D13 D11 D9 D7 D5 D3 D1 D13 D11 D9 D7 D5 D3 D1 D13 D11 D9
OUT#A–
OUT#A+
FR–
FR+
D6 D4 D2 D0 D12 D10 D8 D6 D4 D2 D0 D12 D10 D8 D6 D4 D2 D0 D12 D10 D8
OUT#B–
OUT#B+
NOTE THAT IN THIS MODE FR
+
/FR
–
HAS TWO TIMES THE PERIOD OF ENC
+
/ENC
–
9
90067814fb
LTM9008-14/
LTM9007-14/LTM9006-14
For more information www.linear.com/LTM9008-14
TIMING DIAGRAMS
2-Lane Output Mode, 12-Bit Serialization
1-Lane Output Mode, 16-Bit Serialization
ANALOG
INPUT
ENC–
ENC+
DCO–
DCO+
t
AP
tENCH tENCL
tSER
tSER
tSER
tPD
tDATA
tFRAME
SAMPLE N-6 SAMPLE N-5 SAMPLE N-4
N+1
N
90067814 TD03
D9 D7 D5 D3 D13 D11 D9 D7 D5 D3 D13 D11 D9
OUT#A–
OUT#A+
FR+
FR–
D8 D6 D4 D2 D12 D10 D8 D6 D4 D2 D12 D10 D8
OUT#B–
OUT#B+
ANALOG
INPUT
ENC–
ENC+
DCO–
DCO+
t
AP
tENCH tENCL
tSER
tPD
tDATA
tFRAME
SAMPLE N-6 SAMPLE N-5 SAMPLE N-4
N+1
N
tSER
tSER
90067814 TD04
D1 D0 0 0 D13 D12 D11 D10 D12 D11 D10D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 0 0 D13
OUT#A–
OUT#A+
FR–
FR+
OUT#B
+
, OUT#B
–
ARE DISABLED
1-Lane Output Mode, 14-Bit Serialization
ANALOG
INPUT
ENC–
ENC+
DCO–
DCO+
t
AP
tENCH tENCL
tSER
tPD
tDATA
tFRAME
SAMPLE N-6 SAMPLE N-5 SAMPLE N-4
N+1
N
tSER
tSER
90067814 TD06
D3 D2 D1 D0 D13 D12 D11 D10 D12 D11 D10D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 D13
OUT#A–
OUT#A+
FR–
FR+
OUT#B
+
, OUT#B
–
ARE DISABLED
LTM9008-14/
LTM9007-14/LTM9006-14
10
90067814fb
For more information www.linear.com/LTM9008-14
TIMING DIAGRAMS
1-Lane Output Mode, 12-Bit Serialization
ANALOG
INPUT
ENC–
ENC+
DCO–
DCO+
t
AP
tENCH tENCL
tSER
tPD
tDATA
tFRAME
SAMPLE N-6 SAMPLE N-5 SAMPLE N-4
N+1
N
tSER
tSER
90067814 TD07
D5 D4 D3 D2 D13 D12 D11 D10 D12
D11
D9 D8 D7 D6 D5 D4 D3 D2 D13
OUT#A–
OUT#A+
FR–
FR+
OUT#B
+
, OUT#B
–
ARE DISABLED
A6
tStDS
A5 A4 A3 A2 A1 A0 XX
D7 D6 D5 D4 D3 D2 D1 D0
XX XX XX XX XX XX XX
CS
SCK
SDI R/W
SDO
HIGH IMPEDANCE
SPI Port Timing (Readback Mode)
SPI Port Timing (Write Mode)
tDH
tDO
tSCK tH
A6 A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0
90067814
TD08
CS
SCK
SDI R/W
SDO HIGH IMPEDANCE
11
90067814fb
LTM9008-14/
LTM9007-14/LTM9006-14
For more information www.linear.com/LTM9008-14
TYPICAL PERFORMANCE CHARACTERISTICS
LTM9008-14: Integral
Nonlinearity (INL) vs Output Code
LTM9008-14: Differential
Nonlinearity (DNL) vs Output Code
LTM9008-14: 64k Point FFT,
fIN = 5MHz, –1dBFS, SENSE = VDD
LTM9008-14: 64k Point FFT,
fIN = 30MHz, –1dBFS, SENSE = VDD
LTM9008-14: 64k Point FFT,
fIN = 70MHz, –1dBFS, SENSE = VDD
LTM9008-14: 64k Point 2-Tone FFT,
fIN = 28.5MHz and fIN = 31.5MHz,
–7dBFS per Tone, SENSE = VDD
LTM9008-14: Shorted Input
Histogram
OUTPUT CODE
0
INL ERROR (LSB)
0
1.0
16384
90067814 G01
–1.0
–2.0 4096 8192 12288
2.0
–0.5
0.5
–1.5
1.5
OUTPUT CODE
0
–0.5
DNL ERROR (LSB)
–0.4
–0.2
–0.1
0
0.5
0.2
4096 8192
90067814 G02
–0.3
0.3
0.4
0.1
12288 16384
FREQUENCY (MHz)
0
AMPLITUDE (dBFS)
–80
–20
–10
0
10 20 25
90067814 G03
–100
–110
–40
–60
–90
–30
–120
–50
–70
515 30 35
FREQUENCY (MHz)
0
AMPLITUDE (dBFS)
–80
–20
–10
0
10 20 25
90067814 G04
–100
–110
–40
–60
–90
–30
–120
–50
–70
515 30 35
FREQUENCY (MHz)
0
AMPLITUDE (dBFS)
–80
–20
–10
0
10 20 25
90067814 G05
–100
–110
–40
–60
–90
–30
–120
–50
–70
515 30 35
FREQUENCY (MHz)
0
AMPLITUDE (dBFS)
–80
–20
–10
0
10 20 25
90067814 G06
–100
–110
–40
–60
–90
–30
–120
–50
–70
515 30 35
OUTPUT CODE
8197
1000
0
3000
2000
COUNT
4000
5000
6000
8199 8201 8203 8205
90067814 G07
LTM9008-14/
LTM9007-14/LTM9006-14
12
90067814fb
For more information www.linear.com/LTM9008-14
TYPICAL PERFORMANCE CHARACTERISTICS
LTM9008-14: SNR vs Input
Frequency, –1dBFS, 2V Range,
65Msps
LTM9008-14: SFDR vs Input Level,
fIN = 70MHz, 2V Range, 65Msps
LTM9008-14: IVDD vs Sample Rate,
5MHz Sine Wave Input, –1dBFS
LTM9008-14: SFDR vs Input
Frequency, –1dBFS, 2V Range,
65Msps
IOVDD vs Sample Rate, 5MHz Sine
Wave Input, –1dBFS
LTM9008-14: SNR vs SENSE,
fIN = 5MHz, –1dBFS
LTM9008-14: SNR vs Input Level,
fIN = 70MHz, 2V Range, 65Msps
INPUT FREQUENCY (MHz)
0
72
71
70
69
68
67
66
74
73
SNR (dBFS)
50 100 150 200 250 300
350
90067814 G08
INPUT FREQUENCY (MHz)
0
90
85
80
75
70
65
95
SFDR (dBFS)
50 100 150 200 250 300
350
90067814 G09
INPUT LEVEL (dBFS)
–80
60
50
40
30
20
10
0
80
70
SFDR (dBc AND dBFS)
90
100
110
–70 –60 –50 –40 –30 –20 –10
0
90067814 G11
dBFS
dBc
INPUT LEVEL (dBFS)
60
50
40
30
20
10
0
80
70
SNR (dBc AND dBFS)
–60 –50 –40 –30 –20 –10
0
90067814 G11
dBc
dBFS
SAMPLE RATE (Msps)
320
310
300
290
280
270
260
250
240
230
220
I
VDD
(mA)
0 10 20 30 40 50 60
90067814 G12
SENSE PIN (V)
0.6
72
69
70
71
68
67
73
74
75
SNR (dBFS)
0.7 0.8 0.9 1.1 1.2
1.3
1
90067814 G14
SAMPLE RATE (Msps)
50
40
30
20
10
0
I
OVDD
(mA)
0 20 40 60
90067814 G13
1-LANE, 1.75mA
2-LANE, 3.5mA
2-LANE, 1.75mA
1-LANE, 3.5mA
13
90067814fb
LTM9008-14/
LTM9007-14/LTM9006-14
For more information www.linear.com/LTM9008-14
TYPICAL PERFORMANCE CHARACTERISTICS
LTM9007-14: Integral Nonlinearity
(INL) vs Output Code
LTM9007-14: Differential
Nonlinearity (DNL) vs Output Code
LTM9007-14: 64k Point FFT,
fIN = 5MHz, –1dBFS, SENSE = VDD
LTM9007-14: Shorted Input
Histogram
LTM9007-14: 64k Point FFT,
fIN = 70MHz, –1dBFS, SENSE = VDD
LTM9007-14: 64k Point 2-Tone FFT,
fIN = 28.5MHz and fIN = 31.5MHz,
–7dBFS per Tone, SENSE = VDD
LTM9007-14: 64k Point FFT,
fIN = 30MHz, –1dBFS, SENSE = VDD
OUTPUT CODE
0
INL ERROR (LSB)
0
1.0
16384
90067814 G15
–1.0
–2.0 4096 8192 12288
2.0
–0.5
0.5
–1.5
1.5
OUTPUT CODE
0
–0.5
DNL ERROR (LSB)
–0.4
–0.2
–0.1
0
0.5
0.2
4096 8192
90067814 G16
–0.3
0.3
0.4
0.1
12288 16384
FREQUENCY (MHz)
0
AMPLITUDE (dBFS)
–60
–30
–20
20
90067814 G17
–70
–80
–120 510 15
–100
0
–10
–40
–50
–90
–110
FREQUENCY (MHz)
0
AMPLITUDE (dBFS)
–60
–30
–20
20
90067814 G18
–70
–80
–120 510 15
–100
0
–10
–40
–50
–90
–110
FREQUENCY (MHz)
0
AMPLITUDE (dBFS)
–60
–30
–20
20
90067814 G19
–70
–80
–120 510 15
–100
0
–10
–40
–50
–90
–110
FREQUENCY (MHz)
0
AMPLITUDE (dBFS)
–60
–30
–20
20
90067814 G20
–70
–80
–120 28144 10 166 12 18
–100
0
–10
–40
–50
–90
–110
OUTPUT CODE
8198
1000
0
3000
2000
COUNT
4000
5000
6000
8200 8202 8204 8206
90067814 G21
LTM9008-14/
LTM9007-14/LTM9006-14
14
90067814fb
For more information www.linear.com/LTM9008-14
LTM9007-14: IVDD vs Sample Rate,
5MHz Sine Wave Input, –1dBFS
LTM9007-14: SFDR vs Input Level,
fIN = 70MHz, 2V Range, 40Msps
TYPICAL PERFORMANCE CHARACTERISTICS
LTM9007-14: SNR vs Input
Frequency, –1dBFS, 2V Range,
40Msps
LTM9007-14: SFDR vs Input
Frequency, –1dBFS, 2V Range,
40Msps
LTM9007-14: SNR vs SENSE,
fIN = 5MHz, –1dBFS
INPUT FREQUENCY (MHz)
0
72
71
70
69
68
67
66
74
73
SNR (dBFS)
50 100 150 200 250 300 350
90067814 G22
INPUT FREQUENCY (MHz)
0
90
85
80
75
70
65
95
SFDR (dBFS)
50 100 150 200 250 300 350
90067814 G23
INPUT LEVEL (dBFS)
–80
60
50
40
30
20
10
0
80
70
SFDR (dBc AND dBFS)
90
100
110
–70 –60 –50 –40 –30 –20 –10 0
90067814 G24
dBFS
dBc
SAMPLE RATE (Msps)
200
190
180
170
160
150
140
IVDD (mA)
0 10 20 30 40
90067814 G25
SENSE PIN (V)
0.6
71
68
69
70
67
66
72
73
74
SNR (dBFS)
0.7 0.8 0.9 1.1 1.2 1.31
90067814 G26
15
90067814fb
LTM9008-14/
LTM9007-14/LTM9006-14
For more information www.linear.com/LTM9008-14
TYPICAL PERFORMANCE CHARACTERISTICS
LTM9006-14: 64k Point 2-Tone FFT,
fIN = 28.5MHz and 31.5MHz, –7dBFS
per Tone, SENSE = VDD
LTM9006-14: Shorted Input
Histogram
LTM9006-14: 64k Point FFT,
fIN = 30MHz, –1dBFS, SENSE = VDD
LTM9006-14: 64k Point FFT,
fIN = 70MHz, –1dBFS, SENSE = VDD
LTM9006-14: Integral Nonlinearity
(INL) vs Output Code
LTM9006-14: Differential
Nonlinearity (DNL) vs Output Code
LTM9006-14: 64k Point FFT,
fIN = 5MHz, –1dBFS, SENSE = VDD
OUTPUT CODE
0
INL ERROR (LSB)
0
1.0
16384
90067814 G27
–1.0
–2.0 4096 8192 12288
2.0
–0.5
0.5
–1.5
1.5
OUTPUT CODE
0
–0.5
DNL ERROR (LSB)
–0.4
–0.2
–0.1
0
0.5
0.2
4096 8192
90067814 G28
–0.3
0.3
0.4
0.1
12288 16384
FREQUENCY (MHz)
0
AMPLITUDE (dBFS)
–60
–30
–20
14
90067814 G29
–70
–80
–120 28
410
612
–100
0
–10
–40
–50
–90
–110
FREQUENCY (MHz)
0
AMPLITUDE (dBFS)
–60
–30
–20
14
90067814 G30
–70
–80
–120 28
410
612
–100
0
–10
–40
–50
–90
–110
FREQUENCY (MHz)
0
AMPLITUDE (dBFS)
–60
–30
–20
14
90067814 G31
–70
–80
–120 28
410
612
–100
0
–10
–40
–50
–90
–110
FREQUENCY (MHz)
0
AMPLITUDE (dBFS)
–60
–30
–20
14
90067814 G32
–70
–80
–120 28
410
612
–100
0
–10
–40
–50
–90
–110
OUTPUT CODE
8198
1000
0
3000
2000
COUNT
4000
5000
6000
8200 8202 8204 8206
90067814 G33
LTM9008-14/
LTM9007-14/LTM9006-14
16
90067814fb
For more information www.linear.com/LTM9008-14
TYPICAL PERFORMANCE CHARACTERISTICS
LTM9006-14: IVDD vs Sample Rate,
5MHz Sine Wave Input, –1dBFS
DCO Cycle-Cycle Jitter vs Serial
Data Rate
LTM9006-14: SNR vs SENSE,
fIN = 5MHz, –1dBFS
LTM9006-14: SFDR vs Input Level,
fIN = 70MHz, 2V Range, 25Msps
LTM9006-14: SFDR vs Input
Frequency, –1dBFS, 2V Range,
25Msps
LTM9006-14: SNR vs Input
Frequency, –1dBFS, 2V Range,
25Msps
INPUT FREQUENCY (MHz)
0
72
71
70
69
68
67
66
74
73
SNR (dBFS)
50 100 150 200 250 300 350
90067814 G34
INPUT FREQUENCY (MHz)
0
90
85
80
75
70
65
95
SFDR (dBFS)
50 100 150 200 250 300 350
90067814 G35
INPUT LEVEL (dBFS)
–80
60
50
40
30
20
10
0
80
70
SFDR (dBc AND dBFS)
90
100
110
–70 –60 –50 –40 –30 –20 –10 0
90067814 G36
dBFS
dBc
SAMPLE RATE (Msps)
160
150
140
130
120
IVDD (mA)
0 5 10 15 2520
90067814 G37
SENSE PIN (V)
0.6
71
68
69
70
67
66
72
73
74
SNR (dBFS)
0.7 0.8 0.9 1.1 1.2 1.31
90067814 G38
SERIAL DATA RATE (Mbps)
350
300
250
200
150
100
50
0
PEAK-TO-PEAK JITTER (ps)
0 200 400 600 800 1000
90067814 G39
17
90067814fb
LTM9008-14/
LTM9007-14/LTM9006-14
For more information www.linear.com/LTM9008-14
PIN FUNCTIONS
AIN1+ (B2): Channel 1 Positive Differential Analog Input.
AIN1– (B1): Channel 1 Negative Differential Analog Input.
VCM14 (B3): Common Mode Bias Output, Nominally Equal
to VDD/2. VCM should be used to bias the common mode
of the analog inputs of channels 1 and 4. VCM is internally
bypassed to ground with a 0.1µF ceramic capacitor. No
external capacitance is required.
AIN2+ (C2): Channel 2 Positive Differential Analog Input.
AIN2– (C1): Channel 2 Negative Differential Analog Input.
AIN3+ (E2): Channel 3 Positive Differential Analog Input.
AIN3– (E1): Channel 3 Negative Differential Analog Input.
VCM23 (F3): Common Mode Bias Output, Nominally Equal
to VDD/2. VCM should be used to bias the common mode
of the analog inputs of channels 2 and 3. VCM is internally
bypassed to ground with a 0.1µF ceramic capacitor. No
external capacitance is required.
AIN4+ (G2): Channel 4 Positive Differential Analog Input.
AIN4– (G1): Channel 4 Negative Differential Analog Input.
AIN5+ (H1): Channel 5 Positive Differential Analog Input.
AIN5– (H2): Channel 5 Negative Differential Analog Input.
VCM67 (J3): Common Mode Bias Output, Nominally Equal
to VDD/2. VCM should be used to bias the common mode
of the analog inputs of channels 6 and 7. VCM is internally
bypassed to ground with a 0.1µF ceramic capacitor. No
external capacitance is required.
AIN6+ (K1): Channel 6 Positive Differential Analog Input.
AIN6– (K2): Channel 6 Negative Differential Analog Input.
AIN7+ (M1): Channel 7 Positive Differential Analog Input.
AIN7– (M2): Channel 7 Negative Differential Analog Input.
VCM58 (N3): Common Mode Bias Output, Nominally Equal
to VDD/2. VCM should be used to bias the common mode
of the analog inputs of channels 5 and 8. VCM is internally
bypassed to ground with a 0.1µF ceramic capacitor. No
external capacitance is required.
AIN8+ (N1): Channel 8 Positive Differential Analog Input.
AIN8– (N2): Channel 8 Negative Differential Analog Input
VDD (D3, D4, E3, E4, K3, K4, L3, L4): 1.8V Analog Power
Supply. VDD is internally bypassed to ground with 0.1μF
ceramic capacitors.
ENC+ (P5): Encode Input. Conversion starts on the rising
edge.
ENC– (P6): Encode Complement Input. Conversion starts
on the falling edge.
CSA (L5): In serial programming mode, (PAR/SER = 0V),
CSA is the serial interface chip select input for registers
controlling channels 1, 4, 5 and 8. When CS is low, SCK
is enabled for shifting data on SDI into the mode control
registers. In parallel programming mode (PAR/SER = VDD),
CS selects 2-lane or 1-lane output mode. CS can be driven
with 1.8V to 3.3V logic.
CSB (M5): In serial programming mode, (PAR/SER = 0V),
CSB is the serial interface chip select input for registers
controlling channels 2, 3, 6 and 7. When CS is low, SCK
is enabled for shifting data on SDI into the mode control
registers. In parallel programming mode (PAR/SER = VDD),
CS selects 2-lane or 1-lane output mode. CS can be driven
with 1.8V to 3.3V logic.
SCK (L6): In serial programming mode, (PAR/SER =
0V), SCK is the serial interface clock input. In parallel
programming mode (PAR/SER = VDD), SCK selects 3.5mA
or 1.75mA LVDS output currents. SCK can be driven with
1.8V to 3.3V logic.
SDI (M6): In serial programming mode, (PAR/SER = 0V),
SDI is the serial interface data Input. Data on SDI is clocked
into the mode control registers on the rising edge of SCK.
In parallel programming mode (PAR/SER = VDD), SDI can
be used to power down the part. SDI can be driven with
1.8V to 3.3V logic.
GND (See Pin Configuration Table): ADC Power Ground.
Use multiple vias close to pins.
LTM9008-14/
LTM9007-14/LTM9006-14
18
90067814fb
For more information www.linear.com/LTM9008-14
PIN FUNCTIONS
OVDD (G9, G10): Output Driver Supply. OVDD is internally
bypassed to ground with a 0.1µF ceramic capacitor.
SDOA (E6): In serial programming mode, (PAR/SER = 0V),
SDOA is the optional serial interface data output for
registers controlling channels 1, 4, 5 and 8. Data on SDO
is read back from the mode control registers and can be
latched on the falling edge of SCK. SDO is an open-drain
N-channel MOSFET output that requires an external 2k
pull-up resistor from 1.8V to 3.3V. If read back from the
mode control registers is not needed, the pull-up resis-
tor is not necessary and SDO can be left unconnected. In
parallel programming mode (PAR/SER = VDD), SDOA is an
input that enables internal 100Ω termination resistors on
the digital outputs of channels 1, 4, 5 and 8. When used
as an input, SDO can be driven with 1.8V to 3.3V logic
through a 1k series resistor.
SDOB (D6): Serial Data Output Pin for Channels 2, 3, 6
and 7. See description for SDOA.
PAR/SER (A7): Programming Mode Selection Pin. Connect
to ground to enable the serial programming mode. CSA,
CSB, SCK, SDI, SDOA and SDOB become a serial interface
that control the A/D operating modes. Connect to VDD to
enable parallel programming mode where CSA, CSB, SCK,
SDI, SDOA and SDOB become parallel logic inputs that
control a reduced set of the A/D operating modes. PAR/
SER should be connected directly to ground or the VDD
of the part and not be driven by a logic signal.
VREF (B6): Reference Voltage Output. VREF is internally
bypassed to ground with a 1μF ceramic capacitor, nomi-
nally 1.25V.
SENSE (C5): Reference Programming Pin. Connecting
SENSE to VDD selects the internal reference and a ±1V
input range. Connecting SENSE to ground selects the
internal reference and a ±0.5V input range. An external
reference between 0.625V and 1.3V applied to SENSE
selects an input range of ±0.8 • VSENSE. SENSE is internally
bypassed to ground with a 0.1µF ceramic capacitor.
LVDS Outputs
All pins in this section are differential LVDS outputs.
The output current level is programmable. There is an
optional internal 100Ω termination resistor between the
pins of each LVDS output pair.
OUT1A–/OUT1A+, OUT1B–/OUT1B+ (E7/E8, C8/D8): Serial
Data Outputs for Channel 1. In 1-lane output mode only
OUT1A–/OUT1A+ are used.
OUT2A–/OUT2A+, OUT2B–/OUT2B+ (B8/A8, D7/C7): Serial
Data Outputs for Channel 2. In 1-lane output mode only
OUT2A–/OUT2A+ are used.
OUT3A–/OUT3A+, OUT3B–/OUT3B+ (D10/D9, E10/E9):
Serial Data Outputs for Channel 3. In 1-lane output mode
only OUT3A–/OUT3A+ are used.
OUT4A–/OUT4A+, OUT4B–/OUT4B+ (C9/C10, F7/F8): Serial
Data Outputs for Channel 4. In 1-lane output mode only
OUT4A–/OUT4A+ are used.
OUT5A–/OUT5A+, OUT5B–/OUT5B+ (J8/J7, K8/K7): Serial
Data Outputs for Channel 5. In 1-lane output mode only
OUT5A–/OUT5A+ are used.
OUT6A–/OUT6A+, OUT6B–/OUT6B+ (K9/K10, L9/L10):
Serial Data Outputs for Channel 6. In 1-lane output mode
only OUT6A–/OUT6A+ are used.
OUT7A–/OUT7A+, OUT7B–/OUT7B+ (M7/L7, P8/N8): Serial
Data Outputs for Channel 7. In 1-lane output mode only
OUT7A–/OUT7A+ are used.
OUT8A–/OUT8A+, OUT8B–/OUT8B+ (L8/M8, M10/M9):
Serial Data Outputs for Channel 8. In 1-lane output mode
only OUT8A–/OUT8A+ are used.
FRA–/FRA+ (H7/H8): Frame Start Outputs for Channels
1, 4, 5 and 8.
FRB–/FRB+ (J9/J10): Frame Start Outputs for Channels
2, 3, 6 and 7.
DCOA–/DCOA+ (G8/G7): Data Clock Outputs for Channels
1, 4, 5 and 8.
DCOB–/DCOB+ (F10, F9): Data Clock Outputs for Chan-
nels 2, 3, 6 and 7.
19
90067814fb
LTM9008-14/
LTM9007-14/LTM9006-14
For more information www.linear.com/LTM9008-14
12345678910
AGND GND GND GND GND GND PAR/SER OUT2A+GND GND
BAIN1–AIN1+VCM14 GND GND VREF GND OUT2A–GND GND
CAIN2–AIN2+GND GND SENSE GND OUT2B+OUT1B–OUT4A–OUT4A+
DGND GND VDD VDD GND SDOB OUT2B–OUT1B+OUT3A+OUT3A–
EAIN3–AIN3+VDD VDD GND SDOA OUT1A–OUT1A+OUT3B+OUT3B–
FGND GND VCM23 GND GND GND OUT4B–OUT4B+DCOB+DCOB–
GAIN4–AIN4+GND GND GND GND DCOA+DCOA–OVDD OVDD
HAIN5+AIN5–GND GND GND GND FRA–FRA+GND GND
JGND GND VCM67 GND GND GND OUT5A+OUT5A–FRB–FRB+
KAIN6+AIN6–VDD VDD GND GND OUT5B+OUT5B–OUT6A–OUT6A+
LGND GND VDD VDD CSA SCK OUT7A+OUT8A–OUT6B–OUT6B+
MAIN7+AIN7–GND GND CSB SDI OUT7A–OUT8A+OUT8B+OUT8B–
NAIN8+AIN8–VCM58 GND GND GND GND OUT7B+GND GND
PGND GND GND GND ENC+ENC–GND OUT7B–GND GND
Top View of BGA Package (Looking Through Component).
PIN CONFIGURATION TABLE
LTM9008-14/
LTM9007-14/LTM9006-14
20
90067814fb
For more information www.linear.com/LTM9008-14
FUNCTIONAL BLOCK DIAGRAM
Figure 1. Functional Block Diagram
DIFF
REF
AMP
REF
BUFFER
REFH REFL
RANGE
SELECT
1.25V
REFERENCE
GND
VDD/2
90067814 F01
SENSE
VREF MODE
CONTROL
REGISTERS
OV
DD
= 1.8VV
DD
= 1.8V
OUT1A+
OUT1A–
OUT1B+
OUT1B–
S/H
CH 1
ANALOG
INPUT
14-BIT
ADC CORE
OUT2A+
OUT2A–
OUT2B+
OUT2B–
S/H
CH 2
ANALOG
INPUT
14-BIT
ADC CORE
OUT3A+
OUT3A–
OUT3B+
OUT3B–
S/H
CH 3
ANALOG
INPUT
14-BIT
ADC CORE
OUT4A+
OUT4A–
OUT4B+
OUT4B–
S/H
CH 4
ANALOG
INPUT
14-BIT
ADC CORE
OUT5A+
OUT5A–
OUT5B+
OUT5B–
S/H
CH 5
ANALOG
INPUT
14-BIT
ADC CORE
OUT6A+
OUT6A–
OUT6B+
OUT6B–
S/H
CH 6
ANALOG
INPUT
14-BIT
ADC CORE
OUT7A+
OUT7A–
OUT7B+
OUT7B–
S/H
CH 7
ANALOG
INPUT
14-BIT
ADC CORE
OUT8A+
OUT8A–
OUT8B+
OUT8B–
S/H
CH 8
ANALOG
INPUT
14-BIT
ADC CORE
DCOA±
DCOB±
FRA±
FRB±
ENC+
ENC–
SDOA
SDOB
SDI
SCK
CSA
CSB
PAR/
SER
VCM14 VCM23 VCM67 VCM58
PLL
DATA
SERIALIZER
21
90067814fb
LTM9008-14/
LTM9007-14/LTM9006-14
For more information www.linear.com/LTM9008-14
APPLICATIONS INFORMATION
CONVERTER OPERATION
The LTM9008-14/LTM9007-14/LTM9006-14 are low
power, 8-channel, 14-bit, 65Msps/40Msps/25Msps A/D
converters that are powered by a single 1.8V supply. The
analog inputs should be driven differentially. The encode
input can be driven differentially for optimal jitter perfor-
mance, or single-ended for lower power consumption. The
digital outputs are serial LVDS to minimize the number
of data lines. Each channel outputs two bits at a time
(2-lane mode) or one bit at a time (1-lane mode). Many
additional features can be chosen by programming the
mode control registers through a serial SPI port.
ANALOG INPUT
The analog inputs are differential CMOS sample-and-hold
circuits (Figure 2). The inputs should be driven differentially
around a common mode voltage set by the appropriate
VCM output pins, which are nominally VDD/2. For the 2V
input range, the inputs should swing from VCM – 0.5V
to VCM + 0.5V. There should be 180° phase difference
between the inputs.
The eight channels are simultaneously sampled by a shared
encode circuit (Figure 2).
INPUT DRIVE CIRCUITS
Input Filtering
If possible, there should be an RC low pass filter right at
the analog inputs. This lowpass filter isolates the drive
circuitry from the A/D sample-and-hold switching, and also
limits wideband noise from the drive circuitry. Figure 3
shows an example of an input RC filter. The RC component
values should be chosen based on the application’s input
frequency.
Transformer Coupled Circuits
Figure 3 shows the analog input being driven by an RF
transformer with a center-tapped secondary. The center
tap is biased with VCM, setting the A/D input at its opti-
mal DC level. At higher input frequencies a transmission
line balun transformer (Figures 4 to 6) has better balance,
resulting in lower A/D distortion.
Figure 2. Equivalent Input Circuit. Only One
of the Eight Analog Channels Is Shown
Figure 3. Analog Input Circuit Using a Transformer.
Recommended for Input Frequencies from 5MHz to 70MHz
CSAMPLE
3.5pF
RON
25Ω
RON
25Ω
VDD
VDD
LTM9008-14
AIN+
90067814 F02
CSAMPLE
3.5pF
VDD
AIN–
ENC
–
ENC
+
1.2V
10k
1.2V
10k
CPARASITIC
1.8pF
CPARASITIC
1.8pF
10Ω
10Ω
25Ω
25Ω 25Ω
25Ω
50Ω
0.1µF
AIN+
AIN–
12pF
0.1µF
VCM
LTM9008-14
ANALOG
INPUT
0.1µF T1
1:1
T1: MA/COM MABAES0060
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
90067814 F03
LTM9008-14/
LTM9007-14/LTM9006-14
22
90067814fb
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APPLICATIONS INFORMATION
Amplifier Circuits
Figure 7 shows the analog input being driven by a high
speed differential amplifier. The output of the amplifier is
AC-coupled to the A/D so the amplifier’s output common
mode voltage can be optimally set to minimize distortion.
See back page for a DC-coupled example.
Figure 4. Recommended Front End Circuit for Input
Frequencies from 70MHz to 170MHz
At very high frequencies an RF gain block will often have
lower distortion than a differential amplifier. If the gain
block is single-ended, then a transformer circuit (Figures4
to 6) should convert the signal to differential before driv-
ing the A/D.
Figure 5. Recommended Front End Circuit for Input
Frequencies from 170MHz to 300MHz
25Ω
25Ω
50Ω
0.1µF
AIN+
AIN–
4.7pF
0.1µF
VCM
ANALOG
INPUT
0.1µF
0.1µF
T1
T2
T1: MA/COM MABA-007159-000000
T2: MA/COM MABAES0060
RESISTORS, CAPACITORS ARE 0402 PACKAGE SIZE
90067814 F04
LTM9008-14
25Ω
25Ω
50Ω
0.1µF
AIN+
AIN–
1.8pF
0.1µF
VCM
ANALOG
INPUT
0.1µF
0.1µF
T1
T2
T1: MA/COM MABA-007159-000000
T2: COILCRAFT WBC1-1LB
RESISTORS, CAPACITORS ARE 0402 PACKAGE SIZE
90067814 F05
LTM9008-14
23
90067814fb
LTM9008-14/
LTM9007-14/LTM9006-14
For more information www.linear.com/LTM9008-14
APPLICATIONS INFORMATION
Figure 6. Recommended Front End Circuit for Input
Frequencies Above 300MHz
Figure 7. Front End Circuit Using a High Speed
Differential Amplifier
25Ω
25Ω
50Ω
0.1µF
2.7nH
2.7nH
AIN+
AIN–
0.1µF
VCM
ANALOG
INPUT
0.1µF
0.1µF
T1
T1: MA/COM ETC1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
90067814 F06
LTM9008-14
25Ω
25Ω
200Ω
200Ω
0.1µF AIN+
AIN–
12pF
0.1µF
VCM
LTM9008-14
90067814 F07
––
++
ANALOG
INPUT
HIGH SPEED
DIFFERENTIAL
AMPLIFIER
0.1µF
LTM9008-14/
LTM9007-14/LTM9006-14
24
90067814fb
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APPLICATIONS INFORMATION
Figure 8. Reference Circuit
Figure 9. Using an External 1.25V Reference
Reference
The LTM9008-14/LTM9007-14/LTM9006-14 has an inter-
nal 1.25V voltage reference. For a 2V input range using
the internal reference, connect SENSE to VDD. For a 1V
input range using the internal reference, connect SENSE
to ground. For a 2V input range with an external reference,
apply a 1.25V reference voltage to SENSE (Figure 9).
The input range can be adjusted by applying a voltage to
SENSE that is between 0.625V and 1.30V. The input range
will then be 1.6 • VSENSE. The reference is shared by all
eight ADC channels, so it is not possible to independently
adjust the input range of individual channels.
The VREF , SENSE, REFH and REFL pins are internally
bypassed, as shown in Figure 8.
VREF
1.25V
SENSE
TIE TO VDD FOR 2V RANGE;
TIE TO GND FOR 1V RANGE;
RANGE = 1.6 • VSENSE FOR
0.65V < VSENSE < 1.300V
0.1µF2.2µF
INTERNAL ADC
HIGH REFERENCE BUFFER
90067814 F08
LTM9008-14 5Ω
0.8x
DIFF AMP
INTERNAL ADC
LOW REFERENCE
1.25V BANDGAP
REFERENCE
0.625V
RANGE
DETECT
AND
CONTROL
1µF
0.1µF
0.1µF
0.1µF
SENSE
1.25V
EXTERNAL
REFERENCE
1µF
90067814 F09
LTM9008-14
25
90067814fb
LTM9008-14/
LTM9007-14/LTM9006-14
For more information www.linear.com/LTM9008-14
APPLICATIONS INFORMATION
Encode Input
The signal quality of the encode inputs strongly affects
the A/D noise performance. The encode inputs should
be treated as analog signals—do not route them next to
digital traces on the circuit board. There are two modes
of operation for the encode inputs: the differential encode
mode (Figure 10), and the single-ended encode mode
(Figure 11).
The differential encode mode is recommended for sinu-
soidal, PECL, or LVDS encode inputs (Figures 12 and 13).
Figure 13. PECL or LVDS Encode Drive
Figure 12. Sinusoidal Encode Drive
Figure 10. Equivalent Encode Input Circuit
for Differential Encode Mode
Figure 11. Equivalent Encode Input Circuit for
Single-Ended Encode Mode
The encode inputs are internally biased to 1.2V through
10k equivalent resistance. The encode inputs can be taken
above VDD (up to 3.6V), and the common mode range is
from 1.1V to 1.6V. In the differential encode mode, ENC–
should stay at least 200mV above ground to avoid falsely
triggering the single-ended encode mode. For good jitter
performance ENC+ should have fast rise and fall times.
The single-ended encode mode should be used with CMOS
encode inputs. To select this mode, ENC– is connected
to ground and ENC+ is driven with a square wave encode
VDD
LTM9008-14
90067814 F10
ENC
–
ENC
+
15k
VDD
DIFFERENTIAL
COMPARATOR
30k 30k
ENC+
ENC–
90067814 F11
0V
1.8V TO
3.3V
LTM9008-14
CMOS LOGIC
BUFFER
50Ω 100Ω
0.1µF
0.1µF
0.1µF
T1
T1 = MA/COM ETC1-1-13
RESISTORS AND CAPACITORS
ARE 0402 PACKAGE SIZE
50Ω
LTM9008-14
90067814 F12
ENC–
ENC+
ENC+
ENC–
PECL OR
LVDS
CLOCK
0.1µF
0.1µF
90067814 F13
LTM9008-14
LTM9008-14/
LTM9007-14/LTM9006-14
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APPLICATIONS INFORMATION
input. ENC+ can be taken above VDD (up to 3.6V) so 1.8V
to 3.3V CMOS logic levels can be used. The ENC+ threshold
is 0.9V. For good jitter performance ENC+ should have fast
rise and fall times.
Clock PLL and Duty Cycle Stabilizer
The encode clock is multiplied by an internal phase-locked
loop (PLL) to generate the serial digital output data. If the
encode signal changes frequency or is turned off, the PLL
requires 25µs to lock onto the input clock.
A clock duty cycle stabilizer circuit allows the duty cycle
of the applied encode signal to vary from 30% to 70%.
In the serial programming mode it is possible to disable
the duty cycle stabilizer, but this is not recommended. In
the parallel programming mode the duty cycle stabilizer
is always enabled.
DIGITAL OUTPUTS
The digital outputs of the LTM9008-14/LTM9007-14/
LTM9006-14 are serialized LVDS signals. Each channel
outputs two bits at a time (2-lane mode) or one bit at a
time (1-lane mode). The data can be serialized with 16, 14,
or 12-bit serialization (see the Timing Diagrams section for
details). Note that with 12-bit serialization the two LSBs
are not available—this mode is included for compatibility
with 12-bit versions of these parts.
The output data should be latched on the rising and falling
edges of the data clock out (DCO). A data frame output
(FR) can be used to determine when the data from a new
conversion result begins. In the 2-lane, 14-bit serialization
mode, the frequency of the FR output is halved.
The maximum serial data rate for the data outputs is
1Gbps, so the maximum sample rate of the ADC will de-
pend on the serialization mode as well as the speed grade
of the ADC (see Table 1). The minimum sample rate for
all serialization modes is 5Msps.
By default the outputs are standard LVDS levels: 3.5mA
output current and a 1.25V output common mode volt-
age. An external 100Ω differential termination resistor
is required for each LVDS output pair. The termination
resistors should be located as close as possible to the
LVDS receiver.
The outputs are powered by OVDD which is independent
from the A/D core power.
Table 1. Maximum Sampling Frequency for All Serialization Modes. Note That These Limits Are for the LTM9008-14.
The Sampling Frequency for the Slower Speed Grades Cannot Exceed 40MHz (LTM9007-14) or 25MHz (LTM9006-14)
SERIALIZATION MODE
MAXIMUM SAMPLING
FREQUENCY, fS (MHz) DCO FREQUENCY FR FREQUENCY SERIAL DATA RATE
2-Lane 16-Bit Serialization 65 4 • fSfS8 • fS
2-Lane 14-Bit Serialization 65 3.5 • fS0.5 • fS7 • fS
2-Lane 12-Bit Serialization 65 3 • fSfS6 • fS
1-Lane 16-Bit Serialization 62.5 8 • fSfS16 • fS
1-Lane 14-Bit Serialization 65 7 • fSfS14 • fS
1-Lane 12-Bit Serialization 65 6 • fSfS12 • fS
27
90067814fb
LTM9008-14/
LTM9007-14/LTM9006-14
For more information www.linear.com/LTM9008-14
APPLICATIONS INFORMATION
Programmable LVDS Output Current
The default output driver current is 3.5mA. This current
can be adjusted by control register A2 in the serial pro-
gramming mode. Available current levels are 1.75mA,
2.1mA, 2.5mA, 3mA, 3.5mA, 4mA and 4.5mA. In the
parallel programming mode, the SCK pin can select either
3.5mA or 1.75mA.
Optional LVDS Driver Internal Termination
In most cases, using just an external 100Ω termina-
tion resistor will give excellent LVDS signal integrity. In
addition, an optional internal 100Ω termination resistor
can be enabled by serially programming mode con-
trol register A2. The internal termination helps absorb
any reflections caused by imperfect termination at the
receiver. When the internal termination is enabled, the
output driver current is doubled to maintain the same
output voltage swing. In the parallel programming
mode the SDO pin enables internal termination. Internal
termination should only be used with 1.75mA, 2.1mA or
2.5mA LVDS output current modes.
DATA FORMAT
Table 2 shows the relationship between the analog input
voltage and the digital data output bits. By default the
output data format is offset binary. The 2’s complement
format can be selected by serially programming mode
control register A1.
Digital Output Randomizer
Interference from the A/D digital outputs is sometimes
unavoidable. Digital interference may be from capacitive or
inductive coupling or coupling through the ground plane.
Even a tiny coupling factor can cause unwanted tones
in the ADC output spectrum. By randomizing the digital
output before it is transmitted off chip, these unwanted
tones can be randomized which reduces the unwanted
tone amplitude.
The digital output is randomized by applying an exclusive-
OR logic operation between the LSB and all other data
output bits. To decode, the reverse operation is applied
—an exclusive-OR operation is applied between the LSB
and all other bits. The FR and DCO outputs are not affected.
The output randomizer is enabled by serially programming
mode control register A1.
Table 2. Output Codes vs Input Voltage
AIN+ – AIN–
(2V RANGE)
D13-D0
(OFFSET BINARY)
D13-D0
(2’s COMPLEMENT)
>1.000000V
+0.999878V
+0.999756V
11 1111 1111 1111
11 1111 1111 1111
11 1111 1111 1110
01 1111 1111 1111
01 1111 1111 1111
01 1111 1111 1110
+0.000122V
+0.000000V
–0.000122V
–0.000244V
10 0000 0000 0001
10 0000 0000 0000
01 1111 1111 1111
01 1111 1111 1110
00 0000 0000 0001
00 0000 0000 0000
11 1111 1111 1111
11 1111 1111 1110
–0.999878V
–1.000000V
<–1.000000V
00 0000 0000 0001
00 0000 0000 0000
00 0000 0000 0000
10 0000 0000 0001
10 0000 0000 0000
10 0000 0000 0000
LTM9008-14/
LTM9007-14/LTM9006-14
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APPLICATIONS INFORMATION
Digital Output Test Pattern
To allow in-circuit testing of the digital interface to the
A/D, there is a test mode that forces the A/D data outputs
(D13-D0) of all channels to known values. The digital
output test patterns are enabled by serially programming
mode control registers A3 and A4. When enabled, the test
patterns override all other formatting modes: 2’s comple-
ment and randomizer.
Output Disable
The digital outputs may be disabled by serially program-
ming mode control register A2. The current drive for all
digital outputs including DCO and FR are disabled to save
power or enable in-circuit testing. When disabled the com-
mon mode of each output pair becomes high impedance,
but the differential impedance may remain low.
Sleep and Nap Modes
The A/D may be placed in sleep or nap modes to conserve
power. In sleep mode the entire device is powered down,
resulting in 2mW power consumption. Sleep mode is
enabled by mode control register A1 (serial programming
mode), or by SDI (parallel programming mode). The time
required to recover from sleep mode is about 2ms.
In nap mode any combination of A/D channels can be
powered down while the internal reference circuits and the
PLL stay active, allowing faster wakeup than from sleep
mode. Recovering from nap mode requires at least 100
clock cycles. If the application demands very accurate DC
settling then an additional 50µs should be allowed so the
on-chip references can settle from the slight temperature
shift caused by the change in supply current as the A/D
leaves nap mode. Nap mode is enabled by mode control
register A1 in the serial programming mode.
DEVICE PROGRAMMING MODES
The operating modes of the LTM9008-14/LTM9007-14/
LTM9006-14 can be programmed by either a parallel
interface or a simple serial interface. The serial interface
has more flexibility and can program all available modes.
The parallel interface is more limited and can only program
some of the more commonly used modes.
Parallel Programming Mode
To use the parallel programming mode, PAR/SER should
be tied to VDD. The CS, SCK, SDI and SDO pins are binary
logic inputs that set certain operating modes. These pins
can be tied to VDD or ground, or driven by 1.8V, 2.5V, or
3.3V CMOS logic. When used as an input, SDO should
be driven through a 1k series resistor. Table 3 shows the
modes set by CS, SCK, SDI and SDO.
Table 3. Parallel Programming Mode Control Bits
(PAR/SER = VDD)
Pin DESCRIPTION
CS 2-Lane / 1-Lane Selection Bit
0 = 2-Lane, 16-Bit Serialization Output Mode
1 = 1-Lane, 14-Bit Serialization Output Mode
SCK LVDS Current Selection Bit
0 = 3.5mA LVDS Current Mode
1 = 1.75mA LVDS Current Mode
SDI Power Down Control Bit
0 = Normal Operation
1 = Sleep Mode
SDO Internal Termination Selection Bit
0 = Internal Termination Disabled
1 = Internal Termination Enabled
29
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Table 4. Serial Programming Mode Register Map (PAR/SER = GND)
REGISTER A0: RESET REGISTER (ADDRESS 00h)
D7 D6 D5 D4 D3 D2 D1 D0
RESET X X X X X X X
Note That CSA Controls Channels 1, 4, 5 and 8, CSB Controls Channels 2, 3, 6 and 7.
Bit 7 RESET Software Reset Bit
0 = Not Used
1 = Software Reset. All Mode Control Registers Are Reset to 00h. The ADC Is Momentarily Placed in SLEEP Mode.
After the Reset SPI Write Command Is Complete, Bit D7 Is Automatically Set Back to Zero. The Reset Register Is Write Only.
Bits 6-0 Unused, Don’t Care Bits.
REGISTER A1 (CSA): FORMAT AND POWER-DOWN REGISTER (ADDRESS 01h with CSA = GND)
D7 D6 D5 D4 D3 D2 D1 D0
DCSOFF RAND TWOSCOMP SLEEP NAP_8 NAP_5 NAP_4 NAP_1
Note That CSA Controls Channels 1, 4, 5 and 8, CSB Controls Channels 2, 3, 6 and 7.
Bit 7 DCSOFF Clock Duty Cycle Stabilizer Bit
0 = Clock Duty Cycle Stabilizer On
1 = Clock Duty Cycle Stabilizer Off. This Is Not Recommended.
Bit 6 RAND Data Output Randomizer Mode Control Bit
0 = Data Output Randomizer Mode Off
1 = vData Output Randomizer Mode On
Bit 5 TWOSCOMP Tw o ’s Complement Mode Control Bit
0 = Offset Binary Data Format
1 = Tw o ’s Complement Data Format
Bits 4-0 SLEEP: NAP_X Sleep/Nap Mode Control Bits
00000 = Normal Operation
0XXX1 = Channel 1 in Nap Mode
0XX1X = Channel 4 in Nap Mode
0X1XX = Channel 5 in Nap Mode
01XXX = Channel 8 in Nap Mode
1XXXX = Sleep Mode. Channels 1, 4, 5 and 8 Are Disabled
Note: Any Combination of Channels Can Be Placed in Nap Mode.
Serial Programming Mode
To use the serial programming mode, PAR/SER should be
tied to ground. The CS, SCK, SDI and SDO pins become a
serial interface that program the A/D mode control registers.
Data is written to a register with a 16-bit serial word. Data
can also be read back from a register to verify its contents.
Serial data transfer starts when CS is taken low. The data
on the SDI pin is latched at the first 16 rising edges of
SCK. Any SCK rising edges after the first 16 are ignored.
The data transfer ends when CS is taken high again.
The first bit of the 16-bit input word is the R/W bit. The
next seven bits are the address of the register (A6:A0).
The final eight bits are the register data (D7:D0).
If the R/W bit is low, the serial data (D7:D0) will be writ-
ten to the register set by the address bits (A6:A0). If the
R/W bit is high, data in the register set by the address
bits (A6:A0) will be read back on the SDO pin (see the
Timing Diagrams section). During a read back command
the register is not updated and data on SDI is ignored.
The SDO pin is an open-drain output that pulls to ground
with a 200Ω impedance. If register data is read back
through SDO, an external 2k pull-up resistor is required.
If serial data is only written and read back is not needed,
then SDO can be left floating and no pull-up resistor is
needed. Table 4 shows a map of the mode control registers.
LTM9008-14/
LTM9007-14/LTM9006-14
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APPLICATIONS INFORMATION
REGISTER A1 (CSB): FORMAT AND POWER-DOWN REGISTER (ADDRESS 01h with CSB = GND)
D7 D6 D5 D4 D3 D2 D1 D0
DCSOFF RAND TWOSCOMP SLEEP NAP_7 NAP_6 NAP_3 NAP_2
Note That CSA Controls Channels 1, 4, 5 and 8, CSB Controls Channels 2, 3, 6 and 7.
Bit 7 DCSOFF Clock Duty Cycle Stabilizer Bit
0 = Clock Duty Cycle Stabilizer On
1 = Clock Duty Cycle Stabilizer Off. This Is Not Recommended.
Bit 6 RAND Data Output Randomizer Mode Control Bit
0 = Data Output Randomizer Mode Off
1 = Data Output Randomizer Mode On
Bit 5 TWOSCOMP Tw o ’s Complement Mode Control Bit
0 = Offset Binary Data Format
1 = Tw o ’s Complement Data Format
Bits 4-0 SLEEP: NAP_4:NAP_1 Sleep/Nap Mode Control Bits
00000 = Normal Operation
0XXX1 = Channel 2 in Nap Mode
0XX1X = Channel 3 in Nap Mode
0X1XX = Channel 6 in Nap Mode
01XXX = Channel 7 in Nap Mode
1XXXX = Sleep Mode. Channels 2, 3, 6 and 7 Are Disabled
Note: Any Combination of Channels Can Be Placed in Nap Mode.
REGISTER A2: OUTPUT MODE REGISTER (ADDRESS 02h)
D7 D6 D5 D4 D3 D2 D1 D0
ILVDS2 ILVDS1 ILVDS0 TERMON OUTOFF OUTMODE2 OUTMODE1 OUTMODE0
Note That CSA Controls Channels 1, 4, 5 and 8, CSB Controls Channels 2, 3, 6 and 7.
Bits 7-5 ILVDS2:ILVDS0 LVDS Output Current Bits
000 = 3.5mA LVDS Output Driver Current
001 = 4.0mA LVDS Output Driver Current
010 = 4.5mA LVDS Output Driver Current
011 = Not Used
100 = 3.0mA LVDS Output Driver Current
101 = 2.5mA LVDS Output Driver Current
110 = 2.1mA LVDS Output Driver Current
111 = 1.75mA LVDS Output Driver Current
Bit 4 TERMON LVDS Internal Termination Bit
0 = Internal Termination Off
1 = Internal Termination On. LVDS Output Driver Current Is 2x the Current Set by ILVDS2:ILVDS0. Internal Termination Should Only Be
Used with 1.75mA, 2.1mA or 2.5mA LVDS Output Current Modes.
Bit 3 OUTOFF Output Disable Bit
0 = Digital Outputs Are Enabled.
1 = Digital Outputs Are Disabled.
Bits 2-0 OUTMODE2:OUTMODE0 Digital Output Mode Control Bits
000 = 2-Lanes, 16-Bit Serialization
001 = 2-Lanes, 14-Bit Serialization
010 = 2-Lanes, 12-Bit Serialization
011 = Not Used
100 = Not Used
101 = 1-Lane, 14-Bit Serialization
110 = 1-Lane, 12-Bit Serialization
111 = 1-Lane, 16-Bit Serialization
31
90067814fb
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REGISTER A3: TEST PATTERN MSB REGISTER (ADDRESS 03h)
D7 D6 D5 D4 D3 D2 D1 D0
OUTTEST X TP13 TP12 TP11 TP10 TP9 TP8
Note That CSA Controls Channels 1, 4, 5 and 8, CSB Controls Channels 2, 3, 6 and 7.
Bit 7 OUTTEST Digital Output Test Pattern Control Bit
0 = Digital Output Test Pattern Off
1 = Digital Output Test Pattern On
Bit 6 Unused, Don’t Care Bit.
Bit 5-0 TP13:TP8 Test Pattern Data Bits (MSB)
TP13:TP8 Set the Test Pattern for Data Bit 13 (MSB) Through Data Bit 8.
REGISTER A4: TEST PATTERN LSB REGISTER (ADDRESS 04h)
D7 D6 D5 D4 D3 D2 D1 D0
TP7 TP6 TP5 TP4 TP3 TP2 TP1 TP0
Note That CSA Controls Channels 1, 4, 5 and 8, CSB Controls Channels 2, 3, 6 and 7.
Bit 7-0 TP7:TP0 Test Pattern Data Bits (LSB)
TP7:TP0 Set the Test Pattern for Data Bit 7 Through Data Bit 0 (LSB).
Software Reset
If serial programming is used, the mode control registers
should be programmed as soon as possible after the power
supplies turn on and are stable. The first serial command
must be a software reset which will reset all register data
bits to logic 0. To perform a software reset, bit D7 in the
reset register is written with a logic 1. After the reset SPI
write command is complete, bit D7 is automatically set
back to zero.
GROUNDING AND BYPASSING
The LTM9008-14/LTM9007-14/LTM9006-14 requires a
printed circuit board with a clean unbroken ground plane.
A multilayer board with an internal ground plane in the
first layer beneath the ADC is recommended. Layout for
the printed circuit board should ensure that digital and
analog signal lines are separated as much as possible. In
particular, care should be taken not to run any digital track
alongside an analog signal track or underneath the ADC.
Bypass capacitors are integrated inside the package; ad-
ditional capacitance is optional.
The analog inputs, encode signals, and digital outputs
should not be routed next to each other. Ground fill and
grounded vias should be used as barriers to isolate these
signals from each other.
The pin assignments of the LTM9008-14/LTM9007-14/
LTM9006-14 allow a flow-through layout that makes
it possible to use multiple parts in a small area when
a large number of ADC channels are required. The
device has similar layout rules to other BGA pack-
ages. The layout can be implemented with 6mil blind vias
and 5mil traces. The pinout has been designed to minimize
the space required to route the analog and digital traces.
The analog and digital traces can essentially be routed
within the width of the package. This allows multiple
packages to be located close together for high channel
count applications. Trace lengths for the analog inputs
and digital outputs should be matched as well as possible.
LTM9008-14/
LTM9007-14/LTM9006-14
32
90067814fb
For more information www.linear.com/LTM9008-14
APPLICATIONS INFORMATION
HEAT TRANSFER
Most of the heat generated by the LTM9008-14/LTM9007-14/
LTM9006-14 is transferred from the die through the bot-
tom of the package onto the printed circuit board. The
ground pins should be connected to the internal ground
planes by multiple vias.
Table 5. Internal Trace Lengths
PIN NAME
LENGTH
(mm) PIN NAME
LENGTH
(mm) PIN NAME
LENGTH
(mm) PIN NAME
LENGTH
(mm)
E7 OUT1A–1.775 K8 OUT5B–0.379 E1 AIN3–2.491 F10 DCOB–1.811
E8 OUT1A+1.947 K7 OUT5B+0.528 E2 AIN3+2.505 F9 DCOB+1.812
C8 OUT1B–1.847 K9 OUT6A–1.866 G1 AIN4–3.376 H7 FRA–1.117
D8 OUT1B+1.850 K10 OUT6A+1.865 G2 AIN4+3.372 H8 FRA+1.038
B8 OUT2A–3.233 L9 OUT6B–2.268 H2 AIN5–3.301 J9 FRB–1.644
A8 OUT2A+3.246 L10 OUT6B+2.267 H1 AIN5+3.346 J10 FRB+1.643
D7 OUT2B–0.179 M7 OUT7A–1.089 K2 AIN6–2.506 A7 PAR/SER 3.838
C7 OUT2B+1.127 L7 OUT7A+0.179 K1 AIN6+2.533 L6 SCK 0.240
D10 OUT3A–2.126 P8 OUT7B–3.281 M2 AIN7–3.198 E6 SDOA 0.453
D9 OUT3A+2.177 N8 OUT7B+3.149 M1 AIN7+3.214 D6 SDOB 0.274
E10 OUT3B–1.811 L8 OUT8A–1.862 N2 AIN8–4.726 M6 SDI 1.069
E9 OUT3B+1.812 M8 OUT8A+1.847 N1 AIN8+4.691 B3 VCM14 3.914
C9 OUT4A–3.199 M10 OUT8B–4.021 P6 ENC–4.106 F3 VCM23 0.123
C10 OUT4A+3.196 M9 OUT8B+4.016 P5 ENC+4.106 J3 VCM67 0.079
F7 OUT4B–0.706 B1 AIN1–4.689 L5 CSA 0.919 N3 VCM58 3.915
F8 OUT4B+0.639 B2 AIN1+4.709 M5 CSB 1.162
J8 OUT5A–0.392 C1 AIN2–4.724 G8 DCOA–1.157
J7 OUT5A+0.436 C2 AIN2+4.769 G7 DCOA+1.088
Table 5 lists the trace lengths for the analog inputs and
digital outputs inside the package from the die pad to the
package pad. These should be added to the PCB trace
lengths for best matching.
The material used for the substrate is BT (bismaleimide-
triazine), supplied by Mitsubishi Gas and Chemical. In
the DC to 125MHz range, the speed for the analog input
signals is 198ps/in or 7.795ps/mm. The speed for the
digital outputs is 188.5ps/in or 7.417ps/mm.
35
90067814fb
LTM9008-14/
LTM9007-14/LTM9006-14
For more information www.linear.com/LTM9008-14
TYPICAL APPLICATION
LTM9008-14 Schematic
E3
V+
3V TO 6V
CLK
+
CLK
+
GND
TERM
SDOB
3.3 AUX
JP6
1
2
3
R8
1k
R11
10k EN
DIS
TERM
SDOA
3.3 AUX
JP3
1
2
3
1
2
3
1
2
3
R3
1k EN
DIS
R5
31.6k
1%
R13
31.6k
1%
R4
10k
LANE
CSB
JP3
1
2
3
R1
1k 1 LANE
2 LANE
+1.8V+1.8V
+1.8V
+1.8V
ILVDS
SCK
JP5
R7
1k
1.7mA
3.5mA
LANE
CSA
JP2
R2
1k
1 LANE
2 LANE
+1.8V
PAR/SER
PAR/SER
PAR/SER SENSE VREF SCI SCK CSA CSB SDOA SDOB
MOSI
JP4
R6
1k
PAR
SER
R9
100Ω
E1
EXT REF
R10
1k
C1
2.2µF, 0603
A1
A2
A3
A4
A5
A6
B4
B5
B7
C3
C4
C6
D1
D2
D5
E5
F1
F2
F4
F5
F6
G3
G4
G5
G6
H3
H4
H5
H6
J1
J2
J4
J5
J6
K5
K6
L1
L2
M3
M4
N4
N5
N6
N7
P1
P2
P3
P4
P7
A9
A10
B9
B10
H9
H10
N9
N10
P9
P10
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
A7
C5
B6
M6
L6
L5
M5
E6
D6
LTM9008-14
+1.8V
R20
100Ω
R14
(OPT)
L1
(OPT)
1
2
3
5
4R18
(OPT)
R25
(OPT)
C2
(OPT)
R24
(OPT)
C13
100µF
10V
R28
3k
90067814 TA02
OUT1A+
OUT1A–
OUT1B+
OUT1B–
OUT1A+
OUT1A–
OUT1B+
OUT1B–
E8
E7
D8
C8
OUT2A+
OUT2A–
OUT2B+
OUT2B–
OUT2A+
OUT2A–
OUT2B+
OUT2B–
A8
B8
C7
D7
OUT3A+
OUT3A–
OUT3B+
OUT3B–
OUT3A+
OUT3A–
OUT3B+
OUT3B–
D9
D10
E9
E10
OUT4A+
OUT4A–
OUT4B+
OUT4B–
OUT4A+
OUT4A–
OUT4B+
OUT4B–
C10
C9
F8
F7
OUT5A+
OUT5A–
OUT5B+
OUT5B–
OUT5A+
OUT5A–
OUT5B+
OUT5B–
J7
J8
K7
K8
OUT6A+
OUT6A–
OUT6B+
OUT6B–
OUT6A+
OUT6A–
OUT6B+
OUT6B–
K10
K9
L10
L9
AIN1+
AIN1–
VCM14
AIN1+
AIN1–
VCM14
B2
B1
B3
AIN2+
AIN2–AIN2+
AIN2–
C2
C1
AIN3+
AIN3–
VCM23
AIN3+
AIN3–
VCM23
E2
E1
F3
VCM14 AIN4+
AIN4–AIN4+
AIN4–
G2
G1
AIN5+
AIN5–
VCM67
AIN5+
AIN5–
VCM67
H2
H1
J3
AIN6+
AIN6–AIN6+
AIN6–
K1
K2
AIN8+
AIN8–
VCM58
AIN8+
AIN8–
VCM58
N1
N2
N3
AIN7+
AIN7–AIN7+
AIN7–
M1
M2
ENC+
ENC–ENC+
ENC–
P5
P6 OUT7A+
OUT7A–
OUT7B+
OUT7B–
OUT7A+
OUT7A–
OUT7B+
OUT7B–
M8
L8
M9
M10
FRA+
FRA–
FRB+
FRB–
FRA+
FRA–
FRB+
FRB–
H8
H7
J10
J9
DCOA+
DCOA–
DCOB+
DCOB–
DCOA+
DCOA–
DCOB+
DCOB–
G7
G8
F9
F10
+1.8VO
+1.8VO
+1.8VO
G9
G10
+1.8V +1.8V
+1.8V
+1.8V
+1.8V
+1.8V
+1.8V
+1.8V
+1.8V
D3
D4
E3
E4
K3
K4
L3
L4
C7
4.7pF
C5
4.7pF
R23
5.1Ω
R37
100Ω
R17
5.1Ω
R22
49.9Ω
1%
R21
49.9Ω
1%
C9
0.01µF
R27
(OPT)
C6
0.01µF
(OPT)
C3
0.01µF
R26
(OPT)
R16
(OPT)
R15
(OPT)
J2
J1
E4
T1
MABA-
007159-000000
FB1
BLM31PG330SN1L
FB2
BLM31PG330SN1L
C4
0.01µF
C8
0.01µF
R19
100Ω
+1.8V
+1.8VO
LT3080EDD
C11
1µF
0603
1
2
3
9
OUT
OUT
OUT
OUT
C56
0.1µF
C14
0.1µF
C10
4.7µF
6.3V
0603
C12
1µF
0603 4
SET
6NC
7
8
5
IN
IN
VCTRL
R29
180k
1%
+
+1.8V
+1.8V
C18
(OPT)
C23
(OPT)
C15
(OPT)
C19
(OPT)
C17
(OPT)
(SAME FOR OTHER CHANNELS)
R30
0Ω
0603
R36
0Ω
0603
R31
0Ω
0805
R37
0Ω
0805
R32
0Ω
0603
R38
0Ω
0603
IN+
IN–
R48
100Ω
LTM9008-14/
LTM9007-14/LTM9006-14
36
90067814fb
For more information www.linear.com/LTM9008-14
PACKAGE DESCRIPTION
NOTES:
1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M-1994
2. ALL DIMENSIONS ARE IN MILLIMETERS
BALL DESIGNATION PER JESD MS-028 AND JEP95
4
3
DETAILS OF PIN #1 IDENTIFIER ARE OPTIONAL,
BUT MUST BE LOCATED WITHIN THE ZONE INDICATED.
THE PIN #1 IDENTIFIER MAY BE EITHER A MOLD OR
MARKED FEATURE
PACKAGE TOP VIEW
X
aaa Z
3
SEE NOTES
BGA 140 1116 REV C
TRAY PIN 1
BEVEL PACKAGE IN TRAY LOADING ORIENTATION
COMPONENT
PIN “A1”
Øb (140 PLACES)
D
DETAIL B
PACKAGE SIDE VIEW
MX YZddd
MZeee
0.4 Ø 140x
Y
aaa Z
E
e
A2
F
e
G
LTMXXXXXX
µModule
DETAIL A
SUGGESTED PCB LAYOUT
TOP VIEW
3.600
2.800
2.000
1.200
0.400
0.000
0.400
1.200
2.000
2.800
3.600
5.200
4.400
4.400
5.200
3.600
2.800
2.000
1.200
0.400
0.000
0.400
1.200
2.000
2.800
3.600
4
PIN “A1”
CORNER
1
P
DETAIL A
C
D
E
F
G
H
J
K
L
M
N
A
B
1098765432
PIN 1
PACKAGE BOTTOM VIEW
b
b
AZ
BGA Package
140-Lead (11.25mm × 9.00mm × 2.72mm)
(Reference LTC DWG # 05-08-1849 Rev C)
7
SEE NOTES
5. PRIMARY DATUM -Z- IS SEATING PLANE
6. SOLDER BALL COMPOSITION CAN BE 96.5% Sn/3.0% Ag/0.5% Cu
OR Sn Pb EUTECTIC
7 PACKAGE ROW AND COLUMN LABELING MAY VARY
AMONG µModule PRODUCTS. REVIEW EACH PACKAGE
LAYOUT CAREFULLY
!
SYMBOL
A
A1
A2
b
b1
D
E
e
F
G
H1
H2
aaa
bbb
ccc
ddd
eee
MIN
2.57
0.35
2.22
0.45
0.37
0.27
1.95
NOM
2.72
0.40
2.32
0.50
0.40
11.25
9.0
0.80
10.40
7.2
0.32
2.00
MAX
2.87
0.45
2.42
0.55
0.43
0.37
2.05
0.15
0.10
0.12
0.15
0.08
TOTAL NUMBER OF BALLS: 140
DIMENSIONS
NOTES
BALL HT
BALL DIMENSION
PAD DIMENSION
SUBSTRATE THK
MOLD CAP HT
DETAIL B
SUBSTRATE
A1
ccc Z
// bbb Z
Z
H2
H1
b1
MOLD
CAP
Please refer to http://www.linear.com/product/LTM9008-14#packaging for the most recent package drawings.
37
90067814fb
LTM9008-14/
LTM9007-14/LTM9006-14
For more information www.linear.com/LTM9008-14
REVISION HISTORY
REV DATE DESCRIPTION PAGE NUMBER
A 03/15 Removed mention of OGND 26
B 02/17 Fixed VCM channel pairs: VCM12 changed to VCM14, VCM34 changed to VCM23, VCM56 changed to VCM67, VCM78
changed to VCM58
Corrected pin names for ENC and OUTXX
17, 19, 20, 32,
35, 38
19, 32, 35, 38
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
LTM9008-14/
LTM9007-14/LTM9006-14
38
90067814fb
For more information www.linear.com/LTM9008-14
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
ADCs
LTC2170-14/LTC2171-14/
LTC2172-14 14-Bit, 25Msps/40Msps/65Msps
1.8V Quad ADCs, Ultralow Power 178mW/234mW/360mW, 73.4dB SNR, 85dB SFDR, Serial LVDS Outputs,
7mm × 8mm QFN-52
LTC2173-14/LTC2174-14/
LTC2175-14 14-Bit, 80Msps/105Msps/125Msps
1.8V Quad ADCs, Ultralow Power 412mW/481mW/567mW, 73.4dB SNR, 85dB SFDR, Serial LVDS Outputs,
7mm × 8mm QFN-52
LTM9009-14/LTM9010-14/
LTM9011-14 14-Bit, 80Msps/105Msps/125Msps 1.8V
Octal ADCs, Ultralow Power 801mW/950mW/1145mW, 73.1dB SNR, 85dB SFDR, Serial LVDS Outputs,
11.25mm × 9mm BGA-140
Amplifiers/Filters
LTC6412 800MHz, 31dB Range, Analog-Controlled
Variable Gain Amplifier Continuously Adjustable Gain Control, 35dBm OIP3 at 240MHz, 10dB Noise
Figure, 4mm × 4mm QFN-24
LTC6420-20 1.8GHz Dual Low Noise, Low Distortion
Differential ADC Drivers for 300MHz IF Fixed Gain 10V/V, 1nV/√Hz Total Input Noise, 80mA Supply Current per Amplifier,
3mm × 4mm QFN-20
LTC6421-20 1.3GHz Dual Low Noise, Low Distortion
Differential ADC Drivers Fixed Gain 10V/V, 1nV/√Hz Total Input Noise, 40mA Supply Current per Amplifier,
3mm × 4mm QFN-20
LTC6605-7/ LTC6605-10/
LTC6605-14 Dual Matched 7MHz/10MHz/14MHz
Filters with ADC Drivers Dual Matched 2nd Order Lowpass Filters with Differential Drivers,
Pin-Programmable Gain, 6mm × 3mm DFN-22
Signal Chain Receivers
LTM9002 14-Bit Dual Channel IF/Baseband
Receiver Subsystem
Integrated High Speed ADC, Passive Filters and Fixed Gain Differential Amplifiers
TYPICAL APPLICATION
Single-Ended to Differential Conversion Using LTC6409 and 50MHz
Lowpass Filter (Only One Channel Shown). Filter for Use at 61.44Msps
LTM9008-14
F3
F1
F2
C1
C2
B3
B1
B2
VCM14
AIN2+
AIN2–
AIN3+
AIN3–
VCM23
AIN4+
AIN4–
AIN8+
AIN8–
AIN1+
AIN1–
OUT1A+
OUT1A–
DCO+
DCO–
FR+
FR–
G2
G1
N1
N2
H7
H8
G8
G7
E7
E8
ENC+
ENC–
P5 P6
B6C5
1.8V
1.8V
SENSE
VDD
VREF
OVDD
33pF 100pF
150pF
180nH180nH
3.3V
180nH
180nH
150pF
150Ω 474Ω
37.4Ω
37.4Ω
OUT–
OUT+
VOCM
IN+
V+
IN–
474Ω
75Ω
75Ω
66.9Ω
66.9Ω
0.1µF
0.8pF
0.8pF
68pF
68pF
0.1µF
90067814 TA03
• • •
–
+
150Ω SHDN
GND
49.9Ω
50Ω
• • •
LTC6409
© LINEAR TECHNOLOGY CORPORATION 2012
LT 0217 REV B • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com/LTM9008-14
