LTC5564
1
5564fc
For more information www.linear.com/LTC5564
TYPICAL APPLICATION
FEATURES DESCRIPTION
UltraFast™ 7ns Response
Time 15GHz RF Power
Detector with Comparator
The LT C
®
5564 is a precision, RF power detector for ap-
plications in the 600MHz to 15GHz frequency range. The
LTC5564 operates with input power levels from –24dBm
to 16dBm.
A temperature compensated Schottky diode peak detector,
gain-selectable operational amplifier, and fast comparator
are combined in a small 16-lead 3mm × 3mm QFN package.
The RF input signal is peak detected and then sensed by
both a comparator and amplifier. The comparator provides
a 9ns response time to input levels exceeding VREF along
with a latch enable/disable function. The gain selectable
operational amplifier provides a 350V/µs slew rate and
75MHz of demodulation bandwidth to the analog output.
VOUTADJ and VREF pins allow for the adjustment of VOUT
offset and VCOMP switch point voltages, respectively.
L, LT , LT C , LT M , Linear Technology and the Linear logo are registered trademarks and
UltraFast is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
†Higher frequency operation is achievable with reduced performance. Consult the factory for
more information.
APPLICATIONS
n Temperature Compensated Schottky RF Peak Detector
n Wide Input Frequency Range: 600MHz to 15GHz†
n Wide Input Power Range: –24dBm to 16dBm
n 7ns Typical Response Time
n 75MHz Demodulation Bandwidth
n Programmable Gain Settings for Improved Sensitivity
n Adjustable Amplifier Output Offset Voltage
n High Speed Comparator with Latch Enable:
9ns Typical Response Time
n 16-Lead 3mm × 3mm QFN Package
n Temperature Range: –40°C to 125°C
n RF Signal Presence Detectors for: 802.11a, 802.11b,
802.11g, 802.15, Optical Data Links, Wireless Data
Modems, Wireless and Cable Infrastructure
n 5.8GHz ISM Band Radios
n MMDS Microwave Links
n PA Power Supply Envelope Tracking Control
n Fast Alarm
n Envelope Detector
n Ultra-Wideband Radio
n Radar Detector
VOUT vs Input Power 2.7GHz
RFIN POWER (dBm)
–24
0
VOUT OUTPUT VOLTAGE (mV)
800
600
1400
1800
3400
3200
2600
–16 –12 –4 0
3000
2200
400
200
1200
1000
1600
2400
2800
2000
–20 –8 4812 16
5564 TA01b
VCC = 5V
TA = 25°C
GAIN8
GAIN4
GAIN2
GAIN1
VCOMP
VOUT
NC
17
2.2pF
15GHz
RFIN
1000pF 10pF 100pF
10pF
100pF
G1
G0
5564 F05
68Ω
1000pF
0.5pF
V
CC
VREF
VCC
1
2
3
4
16 15 14 13
12
11
10
9
8765
10k 10k 10k
RFIN
NC
GND
GND
VCCA
VCCP
VOUT
NC
VCCRF
LTC5564
VREF VCOMP
LEN
LEN
VOUTADJ
VOUTADJ G0 G1
Demo Board Schematic Optimized for 15GHz
LTC5564
2
5564fc
For more information www.linear.com/LTC5564
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
Supply Voltages
VCCRF = VCCA = VCCP ............................................5.8V
RFIN Voltage for VCCRF ≤ 5.5V ....................(VCCRF ± 2V)
RFIN Power ......................................................... 16dBm
ICOMP, IVOUT ......................................................... ±10mA
VOUTADJ, VREF, VCOMP, VOUT, G0, G1, LEN ...–0.3V to VCC
Operating Temperature Range (TC) (Note 2)
I-Grade............................................... –40°C to 105°C
H-Grade ............................................. –40°C to 125°C
Max Junction Temperature .................................. 150°C
Storage Temperature Range .................. –65°C to 150°C
(Note 1)
16 15 14 13
5678
TOP VIEW
17
GND
UD PACKAGE
16-LEAD (3mm × 3mm) PLASTIC QFN
9
10
11
12
4
3
2
1RFIN
NC
GND
GND
VCCA
VCCP
VOUT
NC
NC
VCCRF
VREF
VCOMP
LEN
VOUTADJ
G0
G1
TJMAX = 150°C, θJA = 68°C/W, θJC = 7.5°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC5564IUD#PBF LTC5564IUD#TRPBF LFRF 16-Lead (3mm × 3mm) Plastic QFN –40°C to 105°C
LTC5564HUD#PBF LTC5564HUD#TRPBF LFRF 16-Lead (3mm × 3mm) Plastic QFN –40°C to 125°C
Consult LT C Marketing for parts specified with wider operating temperature ranges.
Consult LT C Marketing for information on non-standard lead based finish parts.
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/
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. Supply voltage = VCCRF = VCCA = VCCP = 5V, GAIN1, CLOAD = 10pF,
no RF input signal, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply Voltage I-Grade, –40°C to 105°C Operation l3.0 5.5 V
H-Grade, –40°C to 125°C Operation l3.1 5.5 V
Supply Current 44 mA
Amplifier Characteristics
VOUT Output Offset Supply Voltage = 5V, No RFIN
GAIN1
GAIN2
GAIN4
GAIN8
l
l
195
195
290
295
315
360
395
395
mV
mV
mV
mV
Supply Voltage = 3.3V, No RFIN
GAIN1
GAIN2
GAIN4
GAIN8
l
l
185
185
280
280
290
315
385
385
mV
mV
mV
mV
LTC5564
3
5564fc
For more information www.linear.com/LTC5564
ELECTRICAL CHARACTERISTICS
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: The LTC5564IUD is guaranteed to meet specified performance
from –40°C to 105°C case temperature range (θJC = 7.5°C/W). The
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. Supply voltage = VCCRF = VCCA = VCCP = 5V, GAIN1, CLOAD = 10pF,
no RF input signal, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
VOUT Slew Rate Rise/Fall Supply Voltage = 5V, VOUT 10% to 90%, ∆VOUT = 1.1V (Note 3)
GAIN1, Pin = 10dBm to 16dBm
GAIN2, Pin = 4dBm
GAIN4, Pin = –2dBm
GAIN8, Pin = –8dBm
350/70
185/70
120/70
50/50
V/µs
V/µs
V/µs
V/µs
Supply Voltage = 3.3V, VOUT 10% to 90%, ∆VOUT = 1.1V (Note 3)
GAIN1, Pin = 10dBm to 16dBm
GAIN2, Pin = 4dBm
GAIN4, Pin = –2dBm
GAIN8, Pin = –8dBm
325/70
185/70
120/70
50/50
V/µs
V/µs
V/µs
V/µs
Demodulation Bandwidth (Notes 4, 5)
GAIN1, VOUT = 500mV
GAIN2, VOUT = 500mV
GAIN4, VOUT = 500mV
GAIN8, VOUT = 500mV
75
52
35
15
MHz
MHz
MHz
MHz
VOUTADJ Input Range GAIN1 ∆VOUT = ±100mV (Note 5) 0/225 mV
VOUT Load Capacitance (Note 5) 10 pF
VOUT Output Current Sourcing, RL = 2k 1.7 mA
VOUT Response Time Supply Voltage = 5V, RFIN Step to 50% VOUT (Note 3)
GAIN1, Pin = 10dBm to 16dBm
GAIN2, Pin = 4dBm
GAIN4, Pin = –2dBm
GAIN8, Pin = –8dBm
7.0
9.0
11.0
14.0
ns
ns
ns
ns
Supply Voltage = 3.3V, RFIN Step to 50% VOUT (Note 3)
GAIN1, Pin = 10dBm to 16dBm
GAIN2, Pin = 4dBm
GAIN4, Pin = –2dBm
GAIN8, Pin = –8dBm
7.1
9.0
11.0
14.0
ns
ns
ns
ns
VOUT Output Voltage Swing Supply Voltage = 3V 1.4 V
Comparator Characteristics
Comparator Response Time 10dBm to 16dBm RFIN Step to VCOMP 50% (Note 3) 9 ns
Comparator Hysteresis 10 mV
IVREF Input Current –2.3 µA
RF Characteristics
RFIN Frequency Range (Note 6) 0.6 to 15 GHz
RFIN AC Input Resistance Frequency = 1000MHz, Power Level = 0dBm 135 Ω
RFIN Input Shunt Capacitance Frequency = 1000MHz, Power Level = 0dBm 0.77 pF
RFIN Input Power Range (Note 6) –24 to 16 dBm
Digital I/O
LEN VIL/VIH 0.8 VCCA – 0.8 V
G0 VIL/VIH 0.8 VCCA – 0.8 V
G1 VIL/VIH 0.8 VCCA – 0.8 V
LTC5564HUD is guaranteed to meet specified performance from –40°C to
125°C case temperature.
Note 3: RFIN step from no power to stated level.
Note 4: See typical curve for bandwidth vs output voltage.
Note 5: See Applications Information section.
Note 6: Specification is guaranteed by design and not 100% tested in
production.
LTC5564
4
5564fc
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TYPICAL PERFORMANCE CHARACTERISTICS
Demodulation Bandwidth Demodulation Bandwidth vs VOUT
VOUT Offset vs Supply Voltage
VOUT Pulse Response = –10dBm
VOUT Pulse Response, PIN = 8dBm
FREQUENCY (MHz)
0.01
GAIN (dB)
0.1 1 10 100
1000
5564 G01
–50
30
20
10
–10
–20
–30
–40
0
VOUT = 500mV
GAIN8
GAIN4
GAIN2
GAIN1
VCC (V)
3
V
OUT
(mV)
400
350
300
250
5
5564 G05
3.5 4 4.5
5.5
GAIN8
GAIN4
GAIN2
GAIN1
10ns/DIV 5564 G03
VOUT
500mV/DIV
ASK MODULATED RF
INPUT SIGNAL START
VCC = 5V
ASK MODULATION FREQUENCY 2.7GHz
GAIN1
10ns/DIV 5564 G04
VOUT
50mV/DIV
ASK MODULATED RF
INPUT SIGNAL START
VCC = 5V
ASK MODULATION FREQUENCY 2.7GHz
GAIN1
VOUT (mV)
200
V
OUT
–3dB CROSSOVER (MHz)
40
50
60
500
5564 G02
30
20
0250 300 350 400 450
10
80
70
85°C 25°C –40°C
GAIN1
GAIN2
GAIN4
GAIN8
V
CC
= 5V
+3 STDEV
AVERAGE
–3 STDEV
TEMPERATURE (°C)
–40
–25
–10
5
20
35
50
65
80
95
110
125
230
250
270
290
310
330
350
V
OUT
(mV)
GAIN1
V
OUT
Offset vs Temperature
5564 G06
V
CC
= 5V
+3 STDEV
AVERAGE
–3 STDEV
TEMPERATURE (°C)
–40
–25
–10
5
20
35
50
65
80
95
110
125
230
250
270
290
310
330
350
V
OUT
(mV)
GAIN2
V
OUT
Offset vs Temperature
5564 G07
V
CC
= 5V
+3 STDEV
AVERAGE
–3 STDEV
TEMPERATURE (°C)
–40
–25
–10
5
20
35
50
65
80
95
110
125
230
250
270
290
310
330
350
370
390
410
430
V
OUT
(mV)
GAIN4
V
OUT
Offset vs Temperature
5564 G08
V
CC
= 5V
+3 STDEV
AVERAGE
–3 STDEV
TEMPERATURE (°C)
–40
–25
–10
5
20
35
50
65
80
95
110
125
190
240
290
340
390
440
490
540
590
V
OUT
(mV)
GAIN8
V
OUT
Offset vs Temperature
5564 G09
LTC5564
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5564fc
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TYPICAL PERFORMANCE CHARACTERISTICS
VOUT vs Input Power 10GHz
Supply Current vs Supply Voltage VOUT vs Input Power 1.9GHz
VOUT vs Input Power 2.7GHz
VOUT vs Input Power 8GHz
VCC (V)
3
I
CC
(mA)
48
46
44
42
40
38
36
34
5
5564 G10
3.5 4 4.5
5.5
GAIN1, GAIN2
GAIN4, GAIN8
RFIN POWER (dBm)
–24
0
V
OUT
OUTPUT VOLTAGE (mV)
800
600
1400
1800
3400
3200
2600
–16 –12 –4 0
3000
2200
400
200
1200
1000
1600
2400
2800
2000
–20 –8 4812
16
5564 G11
VCC = 5V
TA = 25°C
GAIN8
GAIN4
GAIN2
GAIN1
RFIN POWER (dBm)
–10
0
V
OUT
OUTPUT VOLTAGE (mV)
800
1600
2400
3200
4800
–6 –2 2 6
5564 G25
10–8 –4 0 4 8 12 14
16
4000
400
1200
2000
2800
4400
3600
VCC = 5V
GAIN1
TA = 25°C
RFIN POWER (dBm)
–10
V
OUT
OUTPUT VOLTAGE (mV)
1600
2000
2400
14 16
5564 G26
1200
800
0–4 2 8
–8 –2 4 10
–6 06 12
400
VCC = 5V
GAIN1
TA = 25°C
RFIN POWER (dBm)
–24
V
OUT
OUTPUT VOLTAGE (mV)
1600
1400
1200
1000
800
600
400
200
0
8
5564 G27
–16 –8 0 164–20 –12 –4 12
VCC = 5V
GAIN1
TA = 25°C
V
CC
= 5V
GAIN1
–40°C
25°C
105°C
125°C
RFIN POWER (dBm)
–10
–8
–6
–4
–2
0
2
4
6
8
10
12
14
16
0
400
800
1200
1600
2000
2400
2800
3200
3600
4000
V
OUT
OUTPUT VOLTAGE (mV)
V
OUT
vs Input Power 700 MHz
5564 G24
V
CC
= 5V
GAIN1
–40°C
125°C
105°C
25°C
RFIN POWER (dBm)
–10
–8
–6
–4
–2
0
2
4
6
8
10
12
14
16
0
400
800
1200
1600
2000
2400
2800
3200
3600
V
OUT
OUTPUT VOLTAGE (mV)
V
OUT
vs Input Power 2.7 GHz
5564 G12
V
CC
= 5V
GAIN1
–40°C
125°C
105°C
25°C
RFIN POWER (dBm)
–10
–8
–6
–4
–2
0
2
4
6
8
10
12
14
16
0
400
800
1200
1600
2000
2400
2800
3200
V
OUT
OUTPUT VOLTAGE (mV)
V
OUT
vs Input Power 5.8 GHz
5564 G13
LTC5564
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5564fc
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TYPICAL PERFORMANCE CHARACTERISTICS
VOUT vs Input Power 15GHz
Comparator Rising Edge
Threshold vs Frequency
GAIN1 VOUT/RFIN Histogram
FREQUENCY (MHz)
0
RISING EDGE V
REF
(mV)
600
800
1000
2000
1400
4000 8000
5564 G16
400
1600
1800
1200
12000
16000
VCC = 5V
TA = 25°C
RFIN = 10dBm
GAIN (V/V)
1.32
PERCENT OF UNITS (%)
20
30
1.40
5564 G17
10
25
15
5
01.34 1.36 1.37
35
1.38
1.33 1.35 1.41
1.39
Comparator Threshold Voltage
vs RF Input Power
GAIN2 VOUT/RFIN Histogram
RFIN POWER (dBm)
–10
0
RISING THRESHOLD VOLTAGE (mV)
400
1200
1600
2000
10 14 18
3600
5564 G15
800
–6 –2 2 6
2400
2800
3200
VREF RISING
VCC = 5V
TA = 25°C
FREQUENCY = 2.7GHz
GAIN (V/V)
2.710 2.750 2.790 2.830 2.870
2.910
0
PERCENT OF UNITS (%)
5
10
15
20
25
5564 G18
RFIN POWER (dBm)
–10
V
OUT
OUTPUT VOLTAGE (mV)
800
1000
14 16
5564 G29
600
0–4 2 8
–8 –2 4 10
–6 06 12
400
VCC = 5V
GAIN1
TA = 25°C
VOUT vs Input Power 10GHz
RFIN POWER (dBm)
–24
V
OUT
OUTPUT VOLTAGE (mV)
2400
3200
4000
4800
8
5564 G28
1600
800
2000
2800
3600
4400
1200
400
0–16 –8 0
–20 12
–12 –4 4
16
VCC = 5V
TA = 25°C
GAIN8
GAIN2
GAIN4
GAIN1
V
CC
= 5V
GAIN1
–40°C
125°C
105°C
25°C
RFIN POWER (dBm)
–10
–8
–6
–4
–2
0
2
4
6
8
10
12
14
16
0
200
400
600
800
1000
1200
1400
1600
1800
V
OUT
OUTPUT VOLTAGE (mV)
V
OUT
vs Input Power 12GHz
5564 G14
LTC5564
7
5564fc
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TYPICAL PERFORMANCE CHARACTERISTICS
GAIN4 VOUT/RFIN Histogram GAIN8 VOUT/RFIN Histogram GAIN2/GAIN1 Histogram
GAIN4/GAIN2 Histogram GAIN8/GAIN4 Histogram
GAIN (V/V)
5.52 5.6 5.68 5.76 5.84 5.92
0
PERCENT OF UNITS (%)
5
10
15
20
5564 G19
GAIN (V/V)
11.425 11.625 11.825 12.025 12.225
12.425
0
PERCENT OF UNITS (%)
2
4
6
8
10
12
5564 G20
GAIN2/GAIN1
1.925 1.945 1.965 1.985 2.005
2.025
0
PERCENT OF UNITS (%)
5
30
35
20
25
10
15
40
45
5564 G21
GAIN4/GAIN2
1.980 2.005 2.030 2.055 2.080
2.105
0
PERCENT OF UNITS (%)
5
10
15
30
35
20
25
40
5564 G22
GAIN8/GAIN4
2.045 2.065 2.085 2.105 2.125
2.145
0
PERCENT OF UNITS (%)
5
10
15
5564 G23
LTC5564
8
5564fc
For more information www.linear.com/LTC5564
PIN FUNCTIONS
RFIN (Pin 1): RF Input Voltage. A coupling capacitor must
be used to connect to the RF signal source. This pin has
an internal 250Ω termination, an internal Schottky diode
detector and an internal 8pF reservoir capacitor.
NC (Pins 2, 9, 16): No Connect. These pins should be left
unconnected by the user for best RF performance.
GND (Pins 3, 4, Exposed Pad Pin 17): These pins should
be tied to system ground. See Applications Information
for best practices.
LEN (Pin 5): Comparator Latch Enable Input. VCOMP will be
latched when LEN is high and transparent when LEN is low.
VOUTADJ (Pin 6): Amplifier Output Offset Adjust. When left
floating, the VOUT pin of the amplifier will be at its nominal
quiescent output offset value. See the Applications Infor-
mation section for adjustment range.
G0, G1 (Pins 7, 8): Amplifier Gain Selection. Logic low or
high levels on the G0 and G1 pins will change the internal
amplifier gain, bandwidth and slew rate characteristics. See
the Applications Information section for gain setting codes.
VOUT (Pin 10): Detector Amplifier Output.
VCCP (Pin 11): High Current Power Supply Pin.
VCCA (Pin 12): Analog Power Supply Pin.
VCOMP (Pin 13): Comparator Output.
VREF (Pin 14): Comparator Negative Input. Apply an ex-
ternal reference voltage to this pin.
VCCRF (Pin 15): RF Power Supply Pin.
LTC5564
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APPLICATIONS INFORMATION
Operation
The LTC5564 is a fast RF detector with a high speed
amplifier and comparator. This product integrates these
functions to provide RF detection over frequencies ranging
from 600MHz to 15GHz. These functions include an RF
Schottky peak detector, internally compensated operational
amplifier, and a comparator as shown in Figure 1. The
LTC5564 has selectable amplifier gains, amplifier output
offset adjustment and comparator latch enable capabilities.
Amplifier
The high speed amplifier offers four gain settings and
is capable of driving a 1.7mA load with an output swing
range of approximately 295mV to VCC – 1.6V. See Table1
for gain setting operation.
The VOUTADJ pin provides output DC offset adjustment
to satisfy various interface requirements. Setting VOUT
to 500mV also provides the maximum demodulation
bandwidth in each gain mode. See Electrical and Typical
Performance Characteristics curve. See Table 1 for the
VP
VCOMP
VOUT
TRANSPARENT
VOUT
TRANSPARENT
5564 F02
VOUT
LATCHED
LEN
VREF
Figure 2. LTC5564 Comparator Latch Enable Function
typical VOUTADJ voltage for the desired VOUT DC output
offset in each gain setting.
RF Detector
The internal temperature compensated Schottky diode
peak detector converts the RF input signal to a low
frequency signal. The detector demonstrates excellent
efficiency and linearity over a wide range of input power
levels. The Schottky diode is nominally biased at 180µA
and drives a parallel reservoir capacitor-resistor network
of 8pF and 1.2k.
Comparator
The high speed comparator compares the external refer-
ence voltage on the VREF pin to the internal signal voltage
VP from the peak detector and produces the output logic
signal VCOMP
. VP is the internal comparator positive input
as shown in Figure 1.
LEN provides latch enable/disable functionality as shown
in Figure 2.
Table 1. Gain Mode and Typical VOUTADJ Operation
PIN
GAIN MODE DESCRIPTION REQUIRED VOUTADJ FOR A GIVEN DC OUTPUT OFFSETG1 G0
GND GND GAIN1 Minimum Gain Setting (VOUT/RFIN ≈ 1.5dB) VOUTADJ = 0.95 • VOUT – 0.174
GND VCCA GAIN2 VOUT/RFIN Increased 6dB VOUTADJ = (VOUT – 0.07)/2.10
VCCA GND GAIN4 VOUT/RFIN Increased 12dB VOUTADJ = (VOUT + 0.05)/3.16
VCCA VCCA GAIN8 VOUT/RFIN Increased 18dB VOUTADJ = (VOUT + 0.25)/5.26
Note: Valid range for VOUT ≈ 0.195V ≤ VOUT ≤ VCC – 1.6
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Propagation Delay, Slew Rate and Response Time
The LTC5564 has been designed for high slew rate op-
eration. For RF input power levels of 10dBm to 16dBm
and a GAIN1 setting, the internal amplifier will slew at
350V/µs.
In a given gain setting slew rate will be maximized
for larger input power levels. Slew rate will degrade with
smaller RFIN amplitude signals or when the amplifier gain
is increased. See Electrical Characteristics.
The LTC5564 has been designed to function as a positive
peak detector. Consequently, the device responds to a
rising signal at the RF detector input much more rapidly
than a falling signal. Correspondingly, the rising edge of
VOUT transitions much more rapidly than the falling edge
transitions as shown in Figure 3.
When operating in unity gain with a 10dBm to 16dBm RF
input signal, the propagation delay to fifty percent ∆VOUT
is approximately 7.0ns.
The operational amplifier has been internally compensated
to provide 75MHz bandwidth with VOUT = 500mV and a
GAIN1 mode setting. With no RF input the output offset
will be approximately 290mV. Lowering the output offset
will degrade bandwidth performance. See the Typical
Performance Characteristics.
APPLICATIONS INFORMATION
Loading, Bypass Capacitors and Board Layout
The LTC5564 has been designed to directly drive a capaci-
tive load of 10pF at VOUT. When driving a capacitive load
greater than 10pF a series resistance should be added
between VOUT and the load to maintain good stability. This
resistance should be placed as close to VOUT as possible.
See Table 2 for typical series resistor values for various
capacitive loads.
Table 2. Typical Series Resistor Values for VOUT
Capacitive Loading
CLOAD R SERIES
Up to 10pF 0Ω
11pF to 20pF 40Ω
21pF to 100pF 68Ω
Greater Than 100pF 100Ω
Good layout practice and proper use of bypass capacitors
will improve circuit performance and reduce the possibility
of measurement error. Bypass capacitors should be used
for pins VCCRF, VCCA, VCCP, VOUTADJ and VREF. Bypass
capacitors should be connected as close to the LTC5564
as possible. All ground return path lengths and ohmic
losses should be minimized. See Figure 5 in the Applica-
tions Information section for the demo board schematic
showing these bypass capacitances.
The LTC5564 return path for all supply currents is through
the Pin 17 exposed pad. A high resistance path from the
Pin 17 exposed pad to power supply ground will cause a
VOUT output offset error. Board layout and connections
that minimize ohmic losses from the Pin 17 exposed pad
to power supply ground will reduce this error. Measure-
ments being made relative to LTC5564 ground should be
made as close to the Pin 17 exposed pad to reduce errors.
Figure 3. VOUT Pulse Response, PIN = 8dBm
10ns/DIV 5564 F03
VOUT
500mV/DIV
ASK MODULATED RF
INPUT SIGNAL START
VCC = 5V
ASK MODULATION FREQUENCY 2.7GHz
GAIN1
LTC5564
12
5564fc
For more information www.linear.com/LTC5564
APPLICATIONS INFORMATION
Figure 4. 600MHz to 15GHz Power Detector
+
RFIN
VCCP
VCCRF
VCCA
GND
VOUT
G1
VCOMP
DETECT
OVERVOLTAGE
EVENT
VREF G0LEN
5564 F04
LTC5564
10 DETECT
VOLTAGE
8
714513
1
11
15
12
3, 4, 17
FROM RF MATCHING
NETWORK/ANTENNA
VCC
47pF
10pF1000pF
µC
Figure 5. Demo Board Schematic Optimized for 15GHz
VCOMP
VOUT
NC
17
2.2pF
15GHz
RFIN
1000pF 10pF 100pF
10pF
100pF
G1
G0
5564 F05
68Ω
1000pF
0.5pF
VCC
VREF
VCC
1
2
3
4
16 15 14 13
12
11
10
9
8765
10k 10k 10k
RFIN
NC
GND
GND
VCCA
VCCP
VOUT
NC
VCCRF
LTC5564
VREF VCOMP
LEN
LEN
VOUTADJ
VOUTADJ G0 G1
Applications
The LTC5564 can be used as a self-standing signal strength
measurement receiver for a wide range of input signals
from –24dBm to 16dBm and frequencies from 600MHz
to 15GHz.
In addition to power detection, the LTC5564 may be used
as a demodulator for AM and ASK modulated signals.
Depending on the application the RSSI may be split into
two branches to provide AC-coupled data (e.g., audio) and
a DC-coupled RSSI output for signal strength measure-
ment and AGC.
LTC5564
13
5564fc
For more information www.linear.com/LTC5564
APPLICATIONS INFORMATION
Figure 6. Demo Board Schematic for 5GHz RF Detector
+
+
NC
VCCRF
VREF VCOMP
VCCA
VCCP
VOUT
NC
GAIN1GAIN0VOUTADJLEN
GND
GND
NC
RFIN
U1
LTC5564IUD
NC
VCCRF
VREF VCOMP
VCCA
VCCP
VOUT
NC
GAIN1GAIN0VOUTADJLEN
GND
GND
NC
RFIN
U1
LTC5564IUD
LTC5564
14
5564fc
For more information www.linear.com/LTC5564
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
3.00 ±0.10
(4 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
1.45 ±0.05
(4 SIDES)
NOTE:
1. DRAWING CONFORMS TO JEDEC PACKAGE OUTLINE MO-220 VARIATION (WEED-2)
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON THE TOP AND BOTTOM OF PACKAGE
PIN 1
TOP MARK
(NOTE 6)
0.40 ±0.10
BOTTOM VIEW—EXPOSED PAD
1.45 ± 0.10
(4-SIDES)
0.75 ±0.05 R = 0.115
TYP
0.25 ±0.05
1
PIN 1 NOTCH R = 0.20 TYP
OR 0.25 × 45° CHAMFER
15 16
2
0.50 BSC
0.200 REF
2.10 ±0.05
3.50 ±0.05
0.70 ±0.05
0.00 – 0.05
(UD16) QFN 0904
0.25 ±0.05
0.50 BSC
PACKAGE OUTLINE
UD Package
16-Lead Plastic QFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1691 Rev Ø)
LTC5564
15
5564fc
For more information www.linear.com/LTC5564
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.
REVISION HISTORY
REV DATE DESCRIPTION PAGE NUMBER
A 02/11 Replaced and renamed Typical Application drawing
Added new curves to Typical Performance Characteristics
Revised Figure 5
1
5, 6
11
B 11/13 Increased case temperature rating from 85°C to 105°C
Revised Note 2 guaranteed case temperature range to –40°C to 105°C
2
3
C 01/15 Added H-Grade specifications
Extended 125°C Characteristics in VOUT Offset vs Temperature in Graphs G06 to G09
Added 105°C and 125°C Curves in VOUT vs Input Power in Graphs G12, G13, G14 and G24
2, 3
4
5, 6
LTC5564
16
5564fc
For more information www.linear.com/LTC5564
LT 0115 REV C • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 2010
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com/LTC5564
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TYPICAL APPLICATION
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PART NUMBER DESCRIPTION COMMENTS
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±1dB Accuracy Over Temperature
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+
RFIN
VCCA
VCCRF
VCCP
GND
VOUTADJ
VOUT
G1
VCOMP VREF G0LEN
5564 TA02
LTC5564
RF INPUT
V
CC
33pF
10pF1000pF
µC
