LTC5592
1
5592fa
For more information www.linear.com/LTC5592
IF
AMP ADC
IF
AMP
RF
2300MHz TO
2400MHz
LNA
BIAS
BIAS
SYNTH
VCCIF
3.3V or 5V
VCCIF
VCC
3.3V
VCC
22pF
22pF
22pF
1µF
22pF 1µF
22pF
150nH 150nH
1nF
1nF
190MHz
SAW
190MHz
BPF
IMAGE
BPF
RFA
RFB
ENA
LO
ENA
(0V/3.3V)
LO 2160MHz
2.2pF
VCCA
VCCB
IFA+IFA–
IFB+IFB–
5592 TA01a
LO
AMP
LO
AMP
ENB ENB
(0V/3.3V)
RF
2300MHz TO
2400MHz
LNA
22pF
IMAGE
BPF
IF
AMP
IF
AMP ADC
150nH 150nH
1nF
1nF 190MHz
SAW
190MHz
BPF
Typical applicaTion
FeaTures DescripTion
Dual 1.6GHz to 2.7GHz
High Dynamic Range
Downconverting Mixer
The LT C
®
5592 is part of a family of dual-channel high dy-
namic range, high gain downconverting mixers covering
the 600MHz to 4.5GHz RF frequency range. The L
TC5592
is optimized for 1.6GHz to 2.7GHz RF applications. The
LO frequency must fall within the 1.5GHz to 2.5GHz
range for optimum performance. A typical application
is a LTE or WiMAX receiver with a 2.3GHz to 2.7GHz RF
input and low side LO.
The LTC5592’s high conversion gain and high dynamic
range enable the use of lossy IF filters in high selectivity
receiver designs, while minimizing the total solution cost,
board space and system-level variation. A low current
mode is provided for additional power savings and each
of the mixer channels has independent shutdown control.
Wideband LTE Receiver
applicaTions
n Conversion Gain: 8.3dB at 2.35GHz
n IIP3: 27.3dBm at 2.35GHz
n Noise Figure: 9.8dB at 2.35GHz
n 15.3dB NF Under 5dBm Blocking
n High Input P1dB
n 47dB Channel-to-Channel Isolation
n 3.3V Supply, 1.3W Power Consumption
n Low Power Mode for 0.8W Consumption
n Independent Channel Shutdown Control
n 50Ω Single-Ended RF and LO Inputs
n LO Input Matched In All Modes
n 0dBm LO Drive Level
n Small Package and Solution Size
n –40°C to 105°C Operation
n 3G/4G Wireless Infrastructure Diversity Receivers
(LTE, W-CDMA, TD-SCDMA, WiMAX, GSM 1800)
n MIMO Infrastructure Diversity Receivers
n High Dynamic Range Downmixer Applications
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
High Dynamic Range Dual Downconverting Mixer Family
PART NUMBER RF RANGE LO RANGE
LTC5590 600MHz to 1.7GHz 700MHz to 1.5GHz
LTC5591 1.3GHz to 2.3GHz 1.4GHz to 2.1GHz
LTC5592 1.6GHz to 2.7GHz 1.5GHz to 2.5GHz
LTC5593 2.3GHz to 4.5GHz 2.1GHz to 4.2GHz
Wideband Conversion Gain
and IIP3 vs IF Frequency
IF FREQUENCY (MHz)
160
6
7
GC (dB)
IIP3 (dBm)
9
10
11
13
14
12
170 190
5592 TA01b
8
180 200 210 220
21
23
25
27
28
29
22
24
26
LO = 2160MHz
PLO = 0dBm
RF = 2350 ±30MHz
TEST CIRCUIT IN FIGURE 1
GC
IIP3
LTC5592 ONLY, MEASURED ON EVALUATION BOARD
LTC5592
2
5592fa
For more information www.linear.com/LTC5592
pin conFiguraTionabsoluTe MaxiMuM raTings
Supply Voltage (VCC) ...............................................4.0V
IF Supply Voltage (VCCIF) .........................................5.5V
Enable Voltage (ENA, ENB) ..............–0.3V to VCC + 0.3V
Bias Adjust Voltage (IFBA, IFBB) ......–0.3V to VCC + 0.3V
Power Select Voltage (ISEL) .............–0.3V to VCC + 0.3V
LO Input Power (1GHz to 3GHz) .............................9dBm
LO Input DC Voltage ............................................... ±0.1V
RFA, RFB Input Power (1GHz to 3GHz) ................15dBm
RFA, RFB Input DC Voltage .................................... ±0.1V
Operating Temperature Range (TC) ........ –40°C to 105°C
Storage Temperature Range .................. –65°C to 150°C
Junction Temperature (TJ) .................................... 150°C
(Note 1)
24 23 22 21 20 19
789
TOP VIEW
25
GND
UH PACKAGE
24-LEAD (5mm × 5mm) PLASTIC QFN
10 11 12
6
5
4
3
2
1
13
14
15
16
17
18
RFA
CTA
GND
GND
CTB
RFB
ISEL
ENA
LO
GND
ENB
GND
GND
IFGNDA
IFA+
IFA–
IFBA
VCCA
GND
IFGNDB
IFB+
IFB–
IFBB
VCCB
TJMAX = 150°C, θJC = 7°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC5592IUH#PBF LTC5592IUH#TRPBF 5592 24-Lead (5mm × 5mm) Plastic QFN –40°C to 105°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC 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/
Dc elecTrical characTerisTics
PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply Requirements (VCCA, VCCB, VCCIFA, VCCIFB)
VCCA, VCCB Supply Voltage (Pins 12, 19) 3.1 3.3 3.5 V
VCCIFA, VCCIFB Supply Voltage (Pins 9, 10, 21, 22) 3.1 3.3 5.3 V
Mixer Supply Current (Pins 12, 19) Both Channels Enabled 199 237 mA
IF Amplifier Supply Current (Pins 9, 10, 21, 22) Both Channels Enabled 202 252 mA
Total Supply Current (Pins 9, 10, 12, 19, 21, 22) Both Channels Enabled 401 489 mA
Total Supply Current – Shutdown ENA = ENB = Low 500 µA
Enable Logic Input (ENA, ENB) High = On, Low = Off
ENA, ENB Input High Voltage (On) 2.5 V
ENA, ENB Input Low Voltage (Off) 0.3 V
ENA, ENB Input Current –0.3V to VCC + 0.3V –20 30 µA
Turn On Time 0.9 µs
Turn Off Time 1 µs
VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25°C,
unless otherwise noted. Test circuit shown in Figure 1. (Note 2)
LTC5592
3
5592fa
For more information www.linear.com/LTC5592
Dc elecTrical characTerisTics
VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25°C,
unless otherwise noted. Test circuit shown in Figure 1. (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Low Power Mode Logic Input (ISEL) High = Low Power, Low = Normal Power Mode
ISEL Input High Voltage 2.5 V
ISEL Input Low Voltage 0.3 V
ISEL Input Current –0.3V to VCC + 0.3V –20 30 µA
Low Power Mode Current Consumption (ISEL = High)
Mixer Supply Current (Pins 12, 19) Both Channels Enabled 130 156 mA
IF Amplifier Supply Current (Pins 9, 10, 21, 22) Both Channels Enabled 122 156 mA
Total Supply Current (Pins 9, 10, 12, 19, 21, 22) Both Channels Enabled 252 312 mA
PARAMETER CONDITIONS MIN TYP MAX UNITS
Conversion Gain RF = 1950MHz
RF = 2350MHz
RF = 2550MHz
6.8
9.5
8.3
8.1
dB
dB
dB
Conversion Gain Flatness RF = 2350 ±30MHz, LO = 2160MHz, IF = 190 ±30MHz ±0.14 dB
Conversion Gain vs Temperature TC = –40ºC to 105ºC, RF = 2350MHz –0.006 dB/°C
Input 3rd Order Intercept RF = 1950MHz
RF = 2350MHz
RF = 2550MHz
24.0
26.3
27.3
26.3
dBm
dBm
dBm
SSB Noise Figure RF = 1950MHz
RF = 2350MHz
RF = 2550MHz
9.4
9.8
9.9
dB
dB
dB
PARAMETER CONDITIONS MIN TYP MAX UNITS
LO Input Frequency Range 1500 to 2500 MHz
RF Input Frequency Range Low Side LO
High Side LO
1600 to 2700
1600 to 2300
MHz
MHz
IF Output Frequency Range Requires External Matching 5 to 500 MHz
RF Input Return Loss ZO = 50Ω, 1600MHz to 2700MHz >13 dB
LO Input Return Loss ZO = 50Ω, 1700MHz to 2500MHz >17 dB
IF Output Impedance Differential at 190MHz 379Ω||2.2pF R||C
LO Input Power fLO = 1700MHz to 2500MHz –4 0 6 dBm
LO to RF Leakage fLO = 1700MHz to 2500MHz <–34 dBm
LO to IF Leakage fLO = 1700MHz to 2500MHz <–37 dBm
RF to LO Isolation fRF = 1600MHz to 2700MHz >57 dB
RF to IF Isolation fRF = 1600MHz to 2700MHz >37 dB
Channel-to-Channel Isolation fRF = 1600MHz to 2700MHz >47 dB
ac elecTrical characTerisTics
VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25°C,
PLO = 0dBm, PRF = –3dBm (∆f = 2MHz for two tone IIP3 tests), unless otherwise noted. Test circuit shown in Figure 1. (Notes 2, 3, 4)
Low Side LO Downmixer Application: ISEL = Low, RF = 1900MHz to 2700MHz, IF = 190MHz, fLO = fRF – fIF
LTC5592
4
5592fa
For more information www.linear.com/LTC5592
PARAMETER CONDITIONS MIN TYP MAX UNITS
Conversion Gain RF = 2350MHz 7.1 dB
Input 3rd Order Intercept RF = 2350MHz 22.3 dBm
SSB Noise Figure RF = 2350MHz 10.2 dB
Input 1dB Compression RF = 2350MHz, VCCIF = 3.3V
RF = 2350MHz, VCCIF = 5V
11.3
12.6
dBm
dBm
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 LTC5592 is guaranteed functional over the case operating
temperature range of –40°C to 105°C (θJC = 7°C/W).
Note 3: SSB Noise Figure measured with a small-signal noise source,
bandpass filter and 6dB matching pad on RF input, bandpass filter and
6dB matching pad on the LO input, and no other RF signals applied.
Note 4: Channel A to channel B isolation is measured as the relative IF
output power of channel B to channel A, with the RF input signal applied to
channel A. The RF input of channel B is 50Ω terminated and both mixers
are enabled.
ac elecTrical characTerisTics
VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, TC = 25°C, PLO = 0dBm,
PRF = –3dBm (∆f = 2MHz for two tone IIP3 tests), unless otherwise noted. Test circuit shown in Figure 1. (Notes 2, 3)
PARAMETER CONDITIONS MIN TYP MAX UNITS
SSB Noise Figure Under Blocking fRF = 2400MHz, fLO = 2210MHz, fBLOCK = 2500MHz
PBLOCK = 5dBm
PBLOCK = 10dBm
15.3
21.2
dB
dB
2RF-2LO Output Spurious Product
(fRF = fLO + fIF/2)
fRF = 2255MHz at –10dBm, fLO = 2160MHz,
fIF = 190MHz
–68 dBc
3RF-3LO Output Spurious Product
(fRF = fLO + fIF/3)
fRF = 2223.33MHz at –10dBm, fLO = 2160MHz,
fIF = 190MHz
–74 dBc
Input 1dB Compression fRF = 2350MHz, VCCIF = 3.3V
fRF = 2350MHz, VCCIF = 5V
11
14.6
dBm
dBm
Low Side LO Downmixer Application: ISEL = Low, RF = 1900MHz to 2700MHz, IF = 190MHz, fLO = fRF – fIF
Low Power Mode, Low Side LO Downmixer Application: ISEL = High, RF = 1900MHz to 2700MHz, IF = 190MHz, fLO = fRF – fIF
PARAMETER CONDITIONS MIN TYP MAX UNITS
Conversion Gain RF = 1750MHz
RF = 1950MHz
RF = 2150MHz
9.1
8.7
8.3
dB
dB
dB
Conversion Gain Flatness RF = 1950 ±30MHz, LO = 2140MHz, IF = 190 ±30MHz ±0.33 dB
Conversion Gain vs Temperature TC = –40ºC to 105ºC, RF = 1900MHz –0.005 dB/°C
Input 3rd Order Intercept RF = 1750MHz
RF = 1950MHz
RF = 2150MHz
25.3
25.4
25.1
dBm
dBm
dBm
SSB Noise Figure RF = 1750MHz
RF = 1950MHz
RF = 2150MHz
9.2
9.8
10.4
dB
dB
dB
SSB Noise Figure Under Blocking fRF = 1950MHz, fLO = 2140MHz, fBLOCK = 1850MHz
PBLOCK = 5dBm
PBLOCK = 10dBm
16.5
22.7
dB
dB
2LO-2RF Output Spurious Product
(fRF = fLO – fIF/2)
fRF = 2045MHz at –10dBm, fLO = 2140MHz,
fIF = 190MHz
–68 dBc
3LO-3RF Output Spurious Product
(fRF = fLO – fIF/3)
fRF = 2076.67MHz at –10dBm, fLO = 2140MHz,
fIF = 190MHz
–75 dBc
Input 1dB Compression RF = 1950MHz, VCCIF = 3.3V
RF = 1950MHz, VCCIF = 5V
10.6
14.0
dBm
dBm
High Side LO Downmixer Application: ISEL = Low, RF = 1600MHz to 2300MHz, IF = 190MHz, fLO = fRF + fIF
LTC5592
5
5592fa
For more information www.linear.com/LTC5592
RF FREQUENCY (MHz)
1900
35
ISOLATION (dB)
45
2300
5592 G03
40
2100 2500 2700
55
50
–40°C
25°C
85°C
Conversion Gain and IIP3 vs
RF Frequency SSB NF vs RF Frequency Channel Isolation vs RF Frequency
1950MHz Conversion Gain, IIP3
and NF vs LO Power
2350MHz Conversion Gain, IIP3
and NF vs LO Power
2550MHz Conversion Gain, IIP3
and NF vs LO Power
Low Side LO
Typical ac perForMance characTerisTics
VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25°C, PLO = 0dBm, PRF = –3dBm (–3dBm/tone for two-tone IIP3 tests,
∆f = 2MHz), IF = 190MHz, unless otherwise noted. Test circuit shown in Figure 1.
Conversion Gain, IIP3 and NF vs
Supply Voltage (Single Supply)
Conversion Gain, IIP3 and NF vs
Supply Voltage (Dual Supply)
Conversion Gain, IIP3 and RF Input
P1dB vs Temperature
RF FREQUENCY (MHz)
1500
6
8
10
IIP3 (dBm)
GC (dB)
14
16
18
24
22
20
1700 2100
5592 G01
12
1900 2300 2500 2700
28
26
6
7
8
10
11
12
15
14
13
9
17
16
GC
IIP3
–40°C
25°C
85°C
105°C
6
7
8
SSB NF (dB)
10
11
12
15
14
13
5592 G02
9
16
RF FREQUENCY (MHz)
1500 1700 2100
1900 2300 2500 2700
–40°C
25°C
85°C
105°C
LO INPUT POWER (dBm)
–6
6
8
10
GC (dB), IIP3 (dBm)
SSB NF (dB)
14
16
18
24
22
20
26
–4 0
5592 G04
12
–2 246
28
0
8
12
16
4
20
2
10
14
18
6
22
–40°C
25°C
85°C
NF
GC
IIP3
LO INPUT POWER (dBm)
–6
6
8
10
GC (dB), IIP3 (dBm)
SSB NF (dB)
14
16
18
24
22
20
26
–4 0
5592 G05
12
–2 246
28
0
8
12
16
4
20
2
10
14
18
6
22
–40°C
25°C
85°C
GC
NF
IIP3
LO INPUT POWER (dBm)
–6
6
8
10
GC (dB), IIP3 (dBm)
SSB NF (dB)
14
16
18
24
22
20
26
–4 0
5592 G06
12
–2 246
28
0
8
12
16
4
20
2
10
14
18
6
22
–40°C
25°C
85°C
IIP3
GC
NF
VCCIF SUPPLY VOLTAGE (V)
3
6
8
10
GC (dB), IIP3 (dBm)
SSB NF (dB)
14
16
18
24
22
20
26
3.5 4.5
5592 G08
12
455.5
30
28
0
8
12
16
4
20
2
10
14
18
6
24
22
–40°C
25°C
85°C
IIP3
GC
NF
RF = 2350MHz
VCC = 3.3V
CASE TEMPERATURE (°C)
–40
6
8
10
GC (dB), IIP3 (dBm), P1dB (dBm)
14
16
18
24
22
20
26
–10 50
5592 G09
12
20 80 110
30
28
IIP3
P1dB
GC
VCCIF = 3.3V
VCCIF = 5V
RF = 2350MHz
VCC, VCCIF SUPPLY VOLTAGE (V)
3
6
8
10
GC (dB), IIP3 (dBm)
SSB NF (dB)
14
16
18
24
22
20
26
3.1 3.3
5592 G07
12
3.2 3.4 3.5 3.6
28
0
8
12
16
4
20
2
10
14
18
6
22
–40°C
25°C
85°C
GC
NF
IIP3
RF = 2350MHz
VCC = VCCIF
LTC5592
6
5592fa
For more information www.linear.com/LTC5592
SSB Noise Figure vs RF Blocker
Power LO Leakage vs LO Frequency RF Isolation vs RF Frequency
Conversion Gain Distribution IIP3 Distribution SSB Noise Figure Distribution
2-Tone IF Output Power, IM3 and
IM5 vs RF Input Power
Single-Tone IF Output Power, 2 × 2
and 3 × 3 Spurs vs RF Input Power
2 × 2 and 3 × 3 Spur Suppression
vs LO Input Power
Low Side LO
Typical ac perForMance characTerisTics
VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25°C, PLO = 0dBm, PRF = –3dBm (–3dBm/tone for two-tone IIP3 tests,
∆f = 2MHz), IF = 190MHz, unless otherwise noted. Test circuit shown in Figure 1.
RF FREQUENCY (MHz)
1500
0
10
20
ISOLATION (dB)
30
50
60
40
1700 21001900 2300
5592 G15
2500 2700
70
RF-IF
RF-LO
GAIN (dB)
7.5
0
5
10
DISTRIBUTION (%)
15
25
20
8 8.5
5592 G16
9
RF = 2350MHz
85°C
25°C
–40°C
NOISE FIGURE (dB)
7
0
15
10
5
20
DISTRIBUTION (%)
25
35
30
8 109
5592 G18
1211
50
40
45
RF = 2350MHz
85°C
25°C
–40°C
RF INPUT POWER (dBm/TONE)
–12
–80
–70
–50
–60
OUTPUT POWER (dBm/TONE)
–40
–30
–20
–10
10
0
–9 –3 0
5592 G10
–6 36
20
IFOUT
RF1 = 2349MHz
RF2 = 2351MHz
LO = 2160MHz
IM5
IM3
RF INPUT POWER (dBm)
–12
–80
–70
–60
OUTPUT POWER (dBm)
–40
–30
0
–10
–20
10
–9 –3
5592 G11
–50
–6 0 3 6
20 IFOUT
(RF = 2350MHz)
LO = 2160MHz
3RF-3LO
(RF = 2223.33MHz)
2RF-2LO
(RF = 2255MHz)
LO INPUT POWER (dBm)
–6
–85
–80
RELATIVE SPUR LEVEL (dBc)
–75
–65
–70
–3 0
5592 G12
36
–55
–60
IF = 190MHz
PRF = –10dBm
LO = 2160MHz
3RF-3LO
(RF = 2223.33MHz)
2RF-2LO
(RF = 2255MHz)
IIP3 (dBm)
24.5
0
15
10
5
20
DISTRIBUTION (%)
25
35
30
25.5 27.526.5
5592 G17
28.5
40 RF = 2350MHz
85°C
25°C
–40°C
RF BLOCKER POWER (dBm)
–20
8
10
12
14
SSB NF (dB)
16
22
20
18
–15 –5–10 0
5592 G13
510
24
PLO = –3dBm
PLO = 0dBm
PLO = 3dBm
PLO = 6dBm
RF = 2400MHz
BLOCKER = 2500MHz
LO FREQUENCY (MHz)
1500
–50
–40
LO LEAKAGE (dBm)
–30
–10
–20
1700 1900 2100
5592 G14
25002300
0
LO-IF
LO-RF
LTC5592
7
5592fa
For more information www.linear.com/LTC5592
Typical ac perForMance characTerisTics
Conversion Gain and IIP3 vs
RF Frequency SSB NF vs RF Frequency
2-Tone IF Output Power, IM3 and
IM5 vs RF Input Power
1950MHz Conversion Gain, IIP3
and NF vs LO Power
2350MHz Conversion Gain, IIP3
and NF vs LO Power
2550MHz Conversion Gain, IIP3
and NF vs LO Power
Low Power Mode, Low Side LO
VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = High, TC = 25°C, PLO = 0dBm, PRF = –3dBm (–3dBm/tone for two-tone IIP3 tests,
∆f = 2MHz), IF = 190MHz, unless otherwise noted. Test circuit shown in Figure 1.
Conversion Gain, IIP3 and NF vs
Supply Voltage (Single Supply)
Conversion Gain, IIP3 and NF vs
Supply Voltage (Dual Supply)
Conversion Gain, IIP3 and RF
Input P1dB vs Temperature
6
8
7
NOISE FIGURE (dB)
10
9
12
11
14
13
5592 G20
16
15
RF FREQUENCY (MHz)
1500 1700 2100
1900 2300 2500 2700
–40°C
25°C
85°C
105°C
5
7
9
IIP3 (dBm)
GC (dB)
13
15
17
23
21
19
5592 G19
11
25
5
9
11
13
7
15
6
10
12
14
8
GC
RF FREQUENCY (MHz)
1500 1700 2100
1900 2300 2500 2700
–40°C
25°C
85°C
105°C
IIP3
LO INPUT POWER (dBm)
–6
5
7
9
GC (dB), IIP3 (dBm)
SSB NF (dB)
13
15
17
25
23
21
19
–4 0
5592 G22
11
–2 246
8
12
16
4
20
0
2
10
14
18
6
IIP3
GC
NF
–40°C
25°C
85°C
VCC, VCCIF SUPPLY VOLTAGE (V)
3
5
7
9
11
GC (dB), IIP3 (dBm)
SSB NF (dB)
15
17
19
25
23
21
3.1 3.3
5592 G25
13
3.2 3.4 3.5 3.6
8
12
16
4
20
0
2
10
14
18
6
–40°C
25°C
85°C
IIP3
GC
NF
VCC = VCCIF
RF = 2350MHz
LO INPUT POWER (dBm)
–6
5
7
9
GC (dB), IIP3 (dBm)
SSB NF (dB)
13
15
17
25
23
21
19
–4 0
5592 G23
11
–2 246
8
12
16
4
20
0
2
10
14
18
6
–40°C
25°C
85°C
IIP3
GC
NF
LO INPUT POWER (dBm)
–6
5
9
7
11
GC (dB), IIP3 (dBm)
SSB NF (dB)
15
17
19
25
23
21
–4 0
5592 G24
13
–2 246
8
12
16
4
20
0
2
10
14
18
6
–40°C
25°C
85°C
IIP3
GC
NF
VCCIF SUPPLY VOLTAGE (V)
3
5
7
9
11
GC (dB), IIP3 (dBm)
SSB NF (dB)
15
17
19
25
23
21
3.5
5592 G26
13
44.5 55.5
8
12
16
4
20
0
2
10
14
18
6
–40°C
25°C
85°C
IIP3
GC
NF
VCC = 3.3V
RF = 2350MHz
CASE TEMPERATURE (°C)
–40
5
7
9
11
GC (dB), IIP3 (dBm), P1dB (dBm)
15
17
19
25
23
21
–10 50
13
20 80 110
VCCIF = 3.3V
VCCIF = 5V
GC
P1dB
IIP3
RF = 2350MHz
RF INPUT POWER (dBm/TONE)
–12
–80
–60
–40
–20
OUTPUT POWER (dBm/TONE)
–9 –3
5592 G21
–6 036
20
0
IM5
IFOUT
RF1 = 2349MHz
RF2 = 2351MHz
LO = 2160MHz
IM3
LTC5592
8
5592fa
For more information www.linear.com/LTC5592
Typical ac perForMance characTerisTics
Conversion Gain and IIP3 vs
RF Frequency SSB NF vs RF Frequency Channel Isolation vs RF Frequency
1750MHz Conversion Gain, IIP3
and NF vs LO Power
1950MHz Conversion Gain, IIP3
and NF vs LO Power
2150MHz Conversion Gain, IIP3
and NF vs LO Power
High Side LO
VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25°C, PLO = 0dBm, PRF = –3dBm (–3dBm/tone for two-tone IIP3 tests,
∆f = 2MHz), IF = 190MHz, unless otherwise noted. Test circuit shown in Figure 1.
Conversion Gain, IIP3 and NF vs
Supply Voltage (Single Supply)
Conversion Gain, IIP3 and NF vs
Supply Voltage (Dual Supply)
Conversion Gain, IIP3 and
RF Input P1dB vs Temperature
RF FREQUENCY (MHz)
1600
8
6
10
12
IIP3 (dBm)
GC (dB)
16
18
20
26
28
24
22
1700 1900
5592 G28
14
6
7
8
10
11
12
15
16
17
14
13
9
1800 2000 2100 23002200
IIP3
GC
–40°C
25°C
85°C
105°C
LO INPUT POWER (dBm)
–6
GC (dB), IIP3 (dBm)
SSB NF (dB)
–4 0
5592 G31
6
14
12
10
8
20
18
16
22
26
28
24
0
4
2
8
6
12
10
20
18
22
IIP3 16
14
–2 2 4 6
–40°C
25°C
85°C
GC
NF
LO INPUT POWER (dBm)
–6
GC (dB), IIP3 (dBm)
SSB NF (dB)
–4 0
5592 G32
6
10
8
14
12
16
18
24
26
28
22
20
0
2
4
8
6
12
10
20
18
22
IIP3 16
14
–2 2 4 6
–40°C
25°C
85°C
GC
NF
LO INPUT POWER (dBm)
–6
GC (dB), IIP3 (dBm)
SSB NF (dB)
–4 0
5592 G33
6
12
10
8
16
14
18
22
20
26
28
24
0
2
4
8
6
12
10
20
18
22
IIP3 16
14
–2 2 4 6
–40°C
25°C
85°C
NF
GC
VCC, VCCIF SUPPLY VOLTAGE (V)
3
GC (dB), IIP3 (dBm)
SSB NF (dB)
3.1 3.2
5592 G34
6
8
10
12
16
14
18
26
24
28
22
20
0
2
8
6
4
12
10
18
20
22
IIP3 16
14
3.3 3.4 3.5 3.6
–40°C
25°C
85°C
GC
NF
VCC = VCCIF
RF = 1950MHz
VCCIF SUPPLY VOLTAGE (V)
3
GC (dB), IIP3 (dBm)
SSB NF (dB)
3.5
5592 G35
6
10
8
14
12
16
18
26
24
28
20
22
0
2
6
4
8
12
10
20
18
22
IIP3 16
14
44.5 5 5.5
–40°C
25°C
85°C
NF
GC
VCC = 3.3V
RF = 1950MHz
CASE TEMPERATURE (°C)
–40
GC (dB), IIP3 (dBm), P1dB (dBm)
–10
5592 G36
6
8
12
10
14
18
16
26
24
28
20
22 IIP3
20 50 80 110
VCCIF = 3.3V
VCCIF = 5V
GC
P1dB
RF = 1950MHz
RF FREQUENCY (MHz)
1600
SSB NF (dB)
1700 1900
5592 G29
6
7
8
10
11
12
15
16
14
13
9
1800 2000 2100 23002200
–40°C
25°C
85°C
105°C
RF FREQUENCY (MHz)
1600
ISOLATION (dB)
1700 1900
5592 G30
35
40
50
55
70
65
60
45
1800 2000 2100 23002200
–40°C
25°C
85°C
LTC5592
9
5592fa
For more information www.linear.com/LTC5592
Typical Dc perForMance characTerisTics
VCC Supply Current vs Supply
Voltage (Mixer + LO Amplifier)
VCCIF Supply Current vs
Supply Voltage (IF Amplifier)
Total Supply Current vs
Temperature (VCC + VCCIF)
VCC Supply Current vs Supply
Voltage (Mixer + LO Amplifier)
VCCIF Supply Current vs Supply
Voltage (IF Amplifier)
Total Supply Current vs
Temperature (VCC + VCCIF)
ISEL = High, ENA = ENB = High, test circuit shown in Figure 1.
ISEL = Low, ENA = ENB = High, test circuit shown in Figure 1.
VCC SUPPLY VOLTAGE (V)
3
SUPPLY CURRENT (mA)
3.1
5592 G37
190
192
194
198
200
202
204
196
206
3.2 3.3 3.4 3.5 3.6
105°C 85°C
25°C
–40°C
VCCIF = VCC
VCCIF SUPPLY VOLTAGE (V)
3
SUPPLY CURRENT (mA)
3.3
5592 G38
130
150
170
190
210
230
250
270
3.6 3.9 4.2 4.5 4.8 5.1 5.4
VCC = 3.3V 105°C
85°C
25°C
–40°C
CASE TEMPERATURE (°C)
–40
SUPPLY CURRENT (mA)
–10
5592 G39
280
300
320
340
360
440
420
400
380
460
480
20 50 80 110
VCC = 3.3V, VCCIF = 5V
(DUAL SUPPLY)
VCC = VCCIF = 3.3V
(SINGLE SUPPLY)
VCC SUPPLY VOLTAGE (V)
3
SUPPLY CURRENT (mA)
3.1
5592 G40
124
126
128
130
132
134
136
3.2 3.3 3.4 3.5 3.6
105°C
85°C
25°C
–40°C
VCCIF = VCC
CASE TEMPERATURE (°C)
–40
SUPPLY CURRENT (mA)
–10
5592 G42
210
250
240
230
220
260
280
270
290
300
20 50 80 110
VCC = 3.3V, VCCIF = 5V
(DUAL SUPPLY)
VCC = VCCIF = 3.3V
(SINGLE SUPPLY)
VCCIF SUPPLY VOLTAGE (V)
3
SUPPLY CURRENT (mA)
3.3
5592 G41
80
110
100
90
130
120
140
160
150
170
3.6 3.9 4.2 4.5 4.8 5.1 5.4
VCC = 3.3V
105°C
85°C
25°C
–40°C
pin FuncTions
RFA, RFB (Pins 1, 6): Single-Ended RF Inputs for Chan-
nels A and B. These pins are internally connected to the
primary sides of the RF input transformers, which have
low DC resistance to ground. Series DC-blocking capaci-
tors should be used to avoid damage to the integrated
transformer when DC voltage is present at the RF inputs.
The RF inputs are impedance matched when the LO input
is driven with a 0±6dBm source between 1.5GHz and
2.5GHz and the channels are enabled.
CTA, CTB (Pins 2, 5): RF Transformer Secondary Center-
Tap on Channels A and B. These pins may require bypass
capacitors to ground to optimize IIP3 performance. Each
pin has an internally generated bias voltage of 1.2V and
must be DC-isolated from ground and VCC.
GND (Pins 3, 4, 7, 13, 15, 24, Exposed Pad Pin 25):
Ground. These pins must be soldered to the RF ground
plane on the circuit board. The exposed pad metal of the
package provides both electrical contact to ground and
good thermal contact to the printed circuit board.
LTC5592
10
5592fa
For more information www.linear.com/LTC5592
pin FuncTions
IFGNDB, IFGNDA (Pins 8, 23): DC Ground Returns for the
IF Amplifiers. These pins must be connected to ground to
complete the DC current paths for the IF amplifiers. Chip
inductors may be used to tune LO-IF and RF-IF leakage.
Typical DC current is 101mA for each pin.
IFB+, IFB–, IFA–, IFA+ (Pins 9, 10, 21, 22): Open-Collector
Differential Outputs for the IF Amplifiers of Channels B and
A. These pins must be connected to a DC supply through
impedance matching inductors, or transformer center-taps.
Typical DC current consumption is 50.5mA into each pin.
IFBB, IFBA (Pins 11, 20): Bias Adjust Pins for the IF
Amplifiers. These pins allow independent adjustment
of the internal IF buffer currents for channels B and A,
respectively. The typical DC voltage on these pins is 2.2V.
If not used, these pins must be DC isolated from ground
and VCC.
VCCB and VCCA (Pins 12, 19): Power Supply Pins for the
LO Buffers and Bias Circuits. These pins must be con-
nected to a regulated 3.3V supply with bypass capacitors
located close to the pins. Typical current consumption is
99.5mA per pin.
block DiagraM
5592 BD
BIAS
BIAS
GND
ENA
ISEL
LO
VCCB
IFBB
VCCA
IFBA
IFB–
IFB+
IFA–
IFA+
IFGNDB
IFGNDA
GND
RFB
LO
AMP
LO
AMP
ENB
GND
IF
AMP
11109 12
14
13
GND 15
16
17
18
6
87
CTB
5
GND
4
GND
3
CTA
2
RFA
1
IF
AMP
22 21 20 192324
ENB, ENA (Pins 14, 17): Enable Pins. These pins allow
Channels B and A, respectively, to be independently en-
abled. An applied voltage of greater than 2.5V activates
the associated channel while a voltage of less than 0.3V
disables the channel. Typical input current is less than
10μA. These pins must not be allowed to float.
LO (Pin 16): Single-Ended Local Oscillator Input. This
pin is internally connected to the primary side of the LO
input transformer and has a low DC resistance to ground.
Series DC-blocking capacitors should be used to avoid
damage to the integrated transformer when DC voltage
present at LO input. The LO input is internally matched
to 50Ω for all states of ENA and ENB.
ISEL (Pin 18): Low Power Select Pin. When this pin is pulled
low (<0.3V), both mixer channels are biased at the normal
current level for best RF performance. When greater than
2.5V is applied, both channels operate at reduced current,
which provides reasonable performance at lower power
consumption. This pin must not be allowed to float.
LTC5592
11
5592fa
For more information www.linear.com/LTC5592
TesT circuiT
L1, L2 vs IF FREQUENCIES
IF (MHz) L1, L2 (nH)
140 270
190 150
240 100
300 56
380 33
450 22
REF DES VALUE SIZE VENDOR
C1A, C1B 22pF 0402 AVX
C2 2.2pF 0402 AVX
C3A, C3B
C5A, C5B
22pF 0402 AVX
C4, C6 1µF0603 AVX
C7A, C7B 1000pF 0402 AVX
C8A, C8B 4.7pF 0402 AVX
L1A, L1B
L2A, L2B
150nH 0603 Coilcraft
T1A, T1B TC4-1W-7ALN+ Mini-Circuits
Figure 1. Standard Downmixer Test Circuit Schematic (190MHz IF)
RF
GND
GND
BIAS
DC1710A
EVALUATION BOARD
STACK-UP
(NELCO N4000-13)
0.015”
0.015”
0.062”
4:1
T1A
IFA
50Ω
C7A
L2AL1A
C5AC6
C3A C4
LTC5592
25
GND
1
192021222324
121110987
LO
50Ω
17
18
16
15
14
C2
5
6 13
4
3
RFA
50Ω
VCCIF
3.3V TO 5V
C1A
C8A
RFB
50Ω
C1B
2
IFGNDAGND IFA+IFA–IFBA
LO
GND
GND
ISEL
ENB
ENA
VCCA
IFGNDBGND IFB+IFB–IFBB VCCB
RFA
CTA
GND
GND
CTB
RFB
5592 TC01
4:1
T1B
IFB
50Ω
C5B
C3B
C7B
L1BL2B
ISEL
(0V/3.3V)
VCC
3.3V
ENA
(0V/3.3V)
ENB
(0V/3.3V)
C8B
LTC5592
12
5592fa
For more information www.linear.com/LTC5592
Introduction
The LTC5592 consists of two identical mixer channels
driven by a common LO input signal. Each high linearity
mixer consists of a passive double-balanced mixer core,
IF buffer amplifier, LO buffer amplifier and bias/enable
circuits. See the Pin Functions and Block Diagram sections
for a description of each pin. Each of the mixers can be
shutdown independently to reduce power consumption and
low current mode can be selected that allows a trade-off
between performance and power consumption. The RF and
LO inputs are single-ended and are internally matched to
50Ω. Low side or high side LO injection can be used. The
IF outputs are differential. The evaluation circuit, shown in
Figure 1, utilizes bandpass IF output matching and an IF
transformer to realize a 50Ω single-ended IF output. The
evaluation board layout is shown in Figure 2.
applicaTions inForMaTion
Figure 2. Evaluation Board Layout (DC1710A)
The secondary winding of the RF transformer is inter-
nally connected to the channel A passive mixer core. The
center-tap of the transformer secondary is connected to
Pin 2 (CTA) to allow the connection of bypass capacitor,
C8A. The value of C8A can be adjusted to improve channel
isolation at specific RF frequencies with minor impact to
conversion gain, linearity and noise performance. When
used, it should be located within 2mm of Pin 2 for proper
high frequency decoupling. The nominal DC voltage on
the CTA pin is 1.2V.
For the RF inputs to be properly matched, the appropriate
LO signal must be applied to the LO input. A broadband
input match is realized with C1A = 22pF. The measured
input return loss is shown in Figure 4 for LO frequencies
of 1.7GHz, 2.16GHz and 2.5GHz. As shown in Figure 4,
the RF input impedance is dependent on LO frequency,
although a single value of C1A is adequate to cover the
1.7GHz to 2.5GHz RF band.
RF Inputs
The RF inputs of channels A and B are identical. The RF
input of channel A, shown in Figure 3, is connected to the
primary winding of an integrated transformer. A 50Ω match
is realized when a series external capacitor, C1A, is con-
nected to the RF input. C1A is also needed for DC blocking
if the source has DC voltage present, since the primary
side of the RF transformer is internally DC-grounded. The
DC resistance of the primary is approximately 3.9Ω.
Figure 3. Channel A RF Input Schematic
Figure 4. RF Port Return Loss
5592 F02
LTC5592
C1A
C8A
RFA
CTA
RFA
TO CHANNEL A
MIXER
1
2
5592 F03
FREQUENCY (MHz)
1500
–25
–20
RETURN LOSS (dB)
–15
–10
0
–5
1700
5592 F04
1900 2100 2300 2500 2700
LO = 1700MHz
LO = 2160MHz
LO = 2500MHz
LTC5592
13
5592fa
For more information www.linear.com/LTC5592
The RF input impedance and input reflection coefficient,
versus RF frequency, are listed in Table 1. The reference
plane for this data is Pin 1 of the IC, with no external
matching, and the LO is driven at 2.16GHz.
Table 1. RF Input Impedance and S11
(at Pin 1, No External Matching, fLO = 2.16GHz)
FREQUENCY
(GHz)
RF INPUT
IMPEDANCE
S11
MAG ANGLE
1.6 66.0 + j6.8 0.15 20
1.7 62.4 + j0.5 0.11 2
1.8 57.9 – j3.8 0.08 –24
1.9 53.2 – j6.1 0.07 –59
2.0 48.5 – j8.8 0.09 –95
2.1 40.6 – j9.3 0.14 –130
2.2 35.0 – j0.1 0.18 –180
2.3 39.3 + j3.7 0.13 –201
2.4 41.2 + j3.9 0.11 –207
2.5 41.7 + j4.3 0.10 –211
2.6 42.8 + j4.1 0.09 –212
2.7 44.1 + j3.6 0.07 –213
applicaTions inForMaTion
Figure 5. LO Input Schematic
LO Input
The LO input, shown in Figure 5, is connected to the
primary winding of an integrated transformer. A 50Ω
impedance match is realized at the LO port by adding
an external series capacitor, C2. This capacitor is also
needed for DC blocking if the LO source has DC voltage
present, since the primary side of the LO transformer is
DC-grounded internally. The DC resistance of the primary
is approximately 1.8Ω.
The secondary of the transformer drives a pair of high
speed limiting differential amplifiers for channels A and B.
The LTC5592’s LO amplifiers are optimized for the 1.7GHz
to 2.5GHz LO frequency range; however, LO frequencies
outside this frequency range may be used with degraded
performance.
The LO port is always 50Ω matched when VCC is applied,
even when one or both of the channels is disabled. This
helps to reduce frequency pulling of the LO source when
the mixer is switched between different operating states.
Figure 6 illustrates the LO port return loss for the different
operating modes.
Figure 6. LO Input Return Loss
The nominal LO input level is 0dBm, though the limiting
amplifiers will deliver excellent performance over a ±6dBm
input power range. Table 2 lists the LO input impedance
and input reflection coefficient versus frequency.
Table 2. LO Input Impedance vs Frequency
(at Pin 16, No External Matching, ENA = ENB = High)
FREQUENCY
(GHz)
INPUT
IMPEDANCE
S11
MAG ANGLE
1.7 46.4 + j34.4 0.34 76
1.8 47.0 + j31.0 0.31 78
1.9 46.5 + J28.2 0.28 81
2.0 44.4 + J26.8 0.28 86
2.1 43.1 + j26.0 0.28 89
2.2 41.8 + j26.2 0.29 91
2.3 40.4 + j27.4 0.31 92
2.4 38.8 + j28.5 0.33 94
2.5 38.0 + j30.4 0.35 93
FREQUENCY (MHz)
1300 17001500
–30
–20
–25
RETURN LOSS (dB)
–15
–10
0
–5
5592 F06
1900 2100 2300 2500
BOTH CHANNELS ON
ONE CHANNEL ON
BOTH CHANNELS OFF
LO
TO
MIXER B
LTC5592
ISEL
5592 F05
18
LO 16
17
ENA
ENB
C2
14
BIAS
BIAS
TO
MIXER A
LTC5592
14
5592fa
For more information www.linear.com/LTC5592
IF Outputs
The IF amplifiers in channels A and B are identical. The IF
amplifier for channel A, shown in Figure 7, has differen-
tial open collector outputs (IFA+ and IFA–), a DC ground
return pin (IFGNDA), and a pin for adjusting the internal
bias (IFBA). The IF outputs must be biased at the sup-
ply voltage (VCCIFA), which is applied through matching
inductors L1A and L2A. Alternatively, the IF outputs can
be biased through the center tap of a transformer (T1A).
The common node of L1A and L2A can be connected to
the center tap of the transformer. Each IF output pin draws
approximately 50.5mA of DC supply current (101mA total).
An external load resistor, R2A, can be used to improve
impedance matching if desired.
IFGNDA (Pin 23) must be grounded or the amplifier will
not draw DC current. Inductor L3A may improve LO-IF
and RF-IF leakage performance in some applications, but
is otherwise not necessary. Inductors should have small
resistance for DC. High DC resistance in L3A will reduce
the IF amplifier supply current, which will degrade RF
performance.
applicaTions inForMaTion
For optimum single-ended performance, the differential
IF output must be combined through an external IF
transformer or a discrete IF balun circuit. The evaluation
board (see Figures 1 and 2) uses a 4:1 IF transformer for
impedance transformation and differential to single-ended
conversion. It is also possible to eliminate the IF transformer
and drive differential filters or amplifiers directly.
The IF output impedance can be modeled as 379Ω in
parallel with 2.2pF. The equivalent small-signal model,
including bondwire inductance, is shown in Figure 8.
Frequency-dependent differential IF output impedance is
listed in Table 3. This data is referenced to the package
pins (with no external components) and includes the ef-
fects of IC and package parasitics.
Figure 7. IF Amplifier Schematic with Bandpass Match
Figure 8. IF Output Small-Signal Model
Bandpass IF Matching
The bandpass IF matching configuration, shown in Figures
1 and 7, is best suited for IF frequencies in the 90MHz to
500MHz range. Resistor R2A may be used to reduce the IF
output resistance for greater bandwidth and inductors L1A
and L2A resonate with the internal IF output capacitance
at the desired IF frequency. The value of L1A, L2A can be
estimated as follows:
L1A =L2A =
1
2πfIF
( )
2•2•CIF
where CIF is the internal IF capacitance (listed in Table 3).
22 21
IFA+IFA–
0.9nH0.9nH
RIF
CIF
LTC5592
5592 F08
4:1
T1A IFA
C7A
L2AL1A
C5A
R2A
L3A (OR SHORT)
VCCIFA
20212223
IF
AMP
BIAS
101mA
4mA
IFBA
VCCA
LTC5592
IGNDA
IFA–
IFA+
R1A
(OPTION TO
REDUCE
DC POWER)
5592 F07
LTC5592
15
5592fa
For more information www.linear.com/LTC5592
Values of L1A and L2A are tabulated in Figure 1 for vari-
ous IF frequencies. The measured IF output return loss
for bandpass IF matching is plotted in Figure 9.
Table 3. IF Output Impedance vs Frequency
FREQUENCY (MHz)
DIFFERENTIAL OUTPUT
IMPEDANCE (RIF || XIF (CIF))
90 403 || – j610 (2.9pF)
140 384 || – j474 (2.4pF)
190 379 || – j381 (2.2pF)
240 380 || – j316 (2.1pF)
300 377 || – j253 (2.1pF)
380 376 || – j210 (2.0pF)
450 360 || – j177 (2.0pF)
applicaTions inForMaTion
Figure 9. IF Output Return Loss with Bandpass Matching board (see Figure 2) has been laid out to accommodate
this matching topology with only minor modifications.
IF Amplifier Bias
The IF amplifier delivers excellent performance with VCCIF
= 3.3V, which allows a single supply to be used for VCC and
VCCIF. At VCCIF = 3.3V, the RF input P1dB of the mixer is
limited by the output voltage swing. For higher P1dB, in
this case, resistor R2A (Figure 7) can be used to reduce
the output impedance and thus the voltage swing, thus
improving P1dB. The trade-off for improved P1dB will be
lower conversion gain.
With VCCIF increased to 5V the P1dB increases by over 3dB,
at the expense of higher power consumption. Mixer P1dB
performance at 1950MHz and 2350MHz is tabulated in Table
4 for VCCIF values of 3.3V and 5V. For the highest conversion
gain, high-Q wire-wound chip inductors are recommended
for L1A and L2A. Low cost multilayer chip inductors may
be substituted, with a slight reduction in conversion gain.
Figure 10. IF Output with Lowpass Matching
Figure 11. IF Output Return Loss with Lowpass Matching
Lowpass IF Matching
For IF frequencies below 90MHz, the inductance values
become unreasonably high and the lowpass topology
shown in Figure 10 is preferred. This topology also can
provide improved RF to IF and LO to IF isolation. VCCIFA
is supplied through the center tap of the 4:1 transformer.
A lowpass impedance transformation is realized by shunt
elements R2A and C9A (in parallel with the internal RIF
and CIF), and series inductors L1A and L2A. Resistor
R2A is used to reduce the IF output resistance for greater
bandwidth, or it can be omitted for the highest conver-
sion gain. The final impedance transformation to 50Ω is
realized by transformer T1A. The measured return loss
is shown in Figure 11 for different values of inductance
(C9A = open). The case with 82nH inductors and a 1k
load resistor (R2A) is also shown. The LTC5592 demo
4:1
T1A IFA
50Ω
VCCIFA
3.1 TO 5.3V
C5A
2122 IFA–
IFA+
C6
C9A
R2A
L1A L2A
LTC5592
5592 F10
FREQUENCY (MHz)
50
–25
–20
RETURN LOSS (dB)
–15
–10
0
–5
100 300
5592 F09
150 200 250 350 400 450 500
270nH
150nH
100nH
56nH
33nH
22nH
RETURN LOSS (dB)
–20
–25
–15
–10
0
–5
FREQUENCY (MHz)
500 100 150
5592 F11
200 250
68nH
100nH
180nH
82nH + 1k
LTC5592
16
5592fa
For more information www.linear.com/LTC5592
applicaTions inForMaTion
Table 4. Performance Comparison with VCCIF = 3.3V and 5V
(RF = 1950MHz, High Side LO, IF = 190MHz)
VCCIF
(V)
R2A
(Ω)
ICCIF
(mA)
GC
(dB)
P1dB
(dBm)
IIP3
(dBm)
NF
(dB)
3.3 Open 202 8.7 10.6 25.4 9.8
1k 202 7.5 11.3 25.4 9.9
5 Open 209 8.7 14.0 25.5 9.9
(RF = 2350MHz, Low Side LO, IF = 190MHz)
VCCIF
(V)
R2A
(Ω)
ICCIF
(mA)
GC
(dB)
P1dB
(dBm)
IIP3
(dBm)
NF
(dB)
3.3 Open 202 8.3 11.0 27.3 9.8
1k 202 7.1 11.8 27.5 9.8
5 Open 209 8.1 14.6 28.0 10.0
The IFBA pin (Pin 20) is available for reducing the DC
current consumption of the IF amplifier, at the expense of
IIP3. The nominal DC voltage at Pin 20 is 2.1V, and this pin
should be left open-circuited for optimum performance.
The internal bias circuit produces a 4mA reference for the
IF amplifier, which causes the amplifier to draw approxi-
mately 101mA. If resistor R1A is connected to Pin 20 as
shown in Figure 7, a portion of the reference current can
be shunted to ground, resulting in reduced IF amplifier
current. For example, R1A = 1k will shunt away 1.5mA
from Pin 20 and the IF amplifier current will be reduced
by 25% to approximately 75.5mA. Table 5 summarizes
RF performance versus IF amplifier current.
Table 5. Mixer Performance with Reduced IF Amplifier Current
RF = 1950MHz, High Side LO, IF = 190MHz, VCC = VCCIF = 3.3V
R1
ICCIF
(mA)
GC
(dB)
IIP3
(dBm)
P1dB
(dBm)
NF
(dB)
Open 202 8.7 25.4 10.6 9.8
4.7kΩ 184 8.5 25.2 10.8 9.8
2.2kΩ 170 8.4 24.8 10.9 9.7
1kΩ 151 8.1 24.4 11.1 9.8
RF = 2350MHz, Low Side LO, IF = 190MHz, VCC = VCCIF = 3.3V
R1
ICCIF
(mA)
GC
(dB)
IIP3
(dBm)
P1dB
(dBm)
NF
(dB)
Open 202 8.3 27.3 11.0 9.8
4.7kΩ 184 8.1 26.8 11.2 9.8
2.2kΩ 170 8.0 26.2 11.2 9.8
1kΩ 151 7.7 25.4 11.3 9.8
Low Power Mode
Both mixer channels can be set to low power mode us-
ing the ISEL pin. This allows flexibility to select a reduced
current mode of operation when lower RF performance is
acceptable, reducing power consumption by 37%. Figure
12 shows a simplified schematic of the ISEL pin interface.
When ISEL is set low (<0.3V), both channels operate at
nominal DC current. When ISEL is set high (>2.5V), the DC
current in both channels is reduced, thus reducing power
consumption. The performance in low power mode and
normal power mode are compared in Table 6.
Figure 12. ISEL Interface Schematic
Table 6. Performance Comparison Between Different Power Modes
RF = 1950MHz, High Side LO, IF = 190MHz, VCC = VCCIF = 3.3V
ISEL
ITOTAL
(mA)
GC
(dB)
IIP3
(dBm)
P1dB
(dBm)
NF
(dB)
Low 401 8.7 25.4 10.6 9.8
High 252 7.4 21.2 10.9 10.2
RF = 2350MHz, Low Side LO, IF = 190MHz, VCC = VCCIF = 3.3V
ISEL
ITOTAL
(mA)
GC
(dB)
IIP3
(dBm)
P1dB
(dBm)
NF
(dB)
Low 401 8.3 27.3 11.0 9.8
High 252 7.1 22.3 11.3 10.2
LTC5592
18
ISEL
VCCB
500Ω
VCCA
5592 F13
19
BIAS A
BIAS B
LTC5592
17
5592fa
For more information www.linear.com/LTC5592
Enable Interface
Figure 13 shows a simplified schematic of the ENA pin
interface (ENB is identical). To enable channel A, the ENA
voltage must be greater than 2.5V. If the enable function
is not required, the enable pin can be connected directly
to VCC. The voltage at the enable pin should never exceed
the power supply voltage (VCC) by more than 0.3V. If this
should occur, the supply current could be sourced through
the ESD diode, potentially damaging the IC.
applicaTions inForMaTion
The Enable pins must be pulled high or low. If left float-
ing, the on/off state of the IC will be indeterminate. If a
three-state condition can exist at the enable pins, then a
pull-up or pull-down resistor must be used.
Supply Voltage Ramping
Fast ramping of the supply voltage can cause a current
glitch in the internal ESD protection circuits. Depending on
the supply inductance, this could result in a supply volt-
age transient that exceeds the maximum rating. A supply
voltage ramp time of greater than 1ms is recommended.
Spurious Output Levels
Mixer spurious output levels versus harmonics of the RF
and LO are tabulated in Tables 7 and 8 for frequencies up
to 10GHz. The spur levels were measured on a standard
evalution board using the test circuit shown in Figure 1.
The spur frequencies can be calculated using the follow-
ing equation:
fSPUR = (M • fRF) – (N • fLO)
Table 7. IF Output Spur Levels (dBc), High Side LO
(RF = 1950MHz, PRF = –3dBm, PLO = 0dBm, VCC = VCCIF = 3.3V, TC = 25°C)
N
M
0 1 2 3 4 5 6 7 8 9
0– –45.2 –46.9 –68.4 –70.8 –75.3 –72.0 –82.0
1–51.0 0 –64.4 –54.5 –68.1 –66.3 –74.9 –72.2
2–80.0 –80.9 –60.6 * –81.4 * * * *
3* –83.5 * –75.8 * * * * * *
4* * * * * * * * * *
5* * * * * * * * * *
6* * * * * * * * * *
7* * * * * * * * * *
8* * * * * * * * *
9* * * * * * * *
10 * * * * * * *
*Less than –90dBc
Table 8. IF Output Spur Levels (dBc), Low Side LO
(RF = 2350MHz, PRF = –3dBm, PLO = 0dBm, VCC = VCCIF = 3.3V, TC = 25°C)
N
M
0 1 2 3 4 5 6 7 8 9
0– –44.9 –46.2 –69.9 –69.7 –78.0 –71.9
1–50.7 0 –63.1 –45.7 –67.0 –68.9 –71.1 –72.2 *
2–77.8 –78.7 –66.5 * –89.1 * * * * *
3* * * –70.1 * * * * * *
4* * * * * * * * * *
5* * * * * * * * * *
6* * * * * * * * * *
7* * * * * * * * *
8* * * * * * * *
9* * * * * * *
10 * * * * * *
*Less than –90dBc
Figure 13. ENA Interface Schematic
LTC5592
17
ENA 500Ω
VCCA
5592 F13
19
ESD
CLAMP
LTC5592
18
5592fa
For more information www.linear.com/LTC5592
UH Package
24-Lead Plastic QFN (5mm × 5mm)
(Reference LTC DWG # 05-08-1747 Rev A)
5.00 ± 0.10
5.00 ± 0.10
NOTE:
1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE
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 0.20mm 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)
0.55 ± 0.10
23
1
2
24
BOTTOM VIEW—EXPOSED PAD
3.25 REF
3.20 ± 0.10
3.20 ± 0.10
0.75 ± 0.05 R = 0.150
TYP
0.30 ± 0.05
(UH24) QFN 0708 REV A
0.65 BSC
0.200 REF
0.00 – 0.05
0.75 ±0.05
3.25 REF
3.90 ±0.05
5.40 ±0.05
0.30 ± 0.05
PACKAGE OUTLINE
0.65 BSC
RECOMMENDED SOLDER PAD LAYOUT
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
PIN 1 NOTCH
R = 0.30 TYP
OR 0.35 × 45°
CHAMFER
R = 0.05
TYP
3.20 ± 0.05
3.20 ± 0.05
UH Package
24-Lead Plastic QFN (5mm × 5mm)
(Reference LTC DWG # 05-08-1747 Rev A)
package DescripTion
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
LTC5592
19
5592fa
For more information www.linear.com/LTC5592
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.
REV DATE DESCRIPTION PAGE NUMBER
A 08/13 Changed LO lower frequency range from 1.7GHz to 1.5GHz.
LO Input Frequency Range: changed lower frequency from 1700MHz to 1500MHz.
RF Input Frequency Range, Low Side LO: changed lower frequency from 1900MHz to 1600MHz.
Updated “Conversion Gain and IIP3 vs RF Frequency” and “SSB NF vs RF Frequency” plots to include 1500MHz
frequency characteristics.
Updated “LO Leakage vs LO Frequency” plot to include 1500MHz frequency characteristics.
Updated “Conversion Gain and IIP3 vs RF Frequency” and “SSB NF vs RF Frequency” plots to include 1500MHz
frequency characteristics.
Pin Functions section RFA, RFB (Pins 1, 6): Changed LO input source lower frequency from 1.7GHz to 1.5GHz.
Right column, last paragraph. Deleted sentence: “These LO frequencies correspond to lower, middle and upper
values in the LO range.”
Figure 6, updated the LO Input Return Loss plot to include 1300MHz frequency characteristics.
1
3
3
5
6
7
9
12
13
revision hisTory
LTC5592
20
5592fa
For more information www.linear.com/LTC5592
LINEAR TECHNOLOGY CORPORATION 2011
LT 0813 REV A • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com/LTC5592
relaTeD parTs
Typical applicaTion
Downconverting Mixer with 470MHz IF
PART
NUMBER DESCRIPTION COMMENTS
Infrastructure
LTC5569 300MHz to 4GHz, 3.3V Dual Active
Downconverting Mixer
2dB Gain, 26.7dBm IIP3 and 11.7dB NF at 1950MHz, 3.3V/180mA Supply
LT5557 400MHz to 3.8GHz, 3.3V Downconverting Mixer 2.9dB Gain, 24.7dBm IIP3 and 11.7dB NF at 1950MHz, 3.3V/82mA Supply
LTC6416 2GHz 16-Bit ADC Buffer 40.25dBm OIP3 to 300MHz, Programmable Fast Recovery Output Clamping
LTC6412 31dB Linear Analog VGA 35dBm OIP3 at 240MHz, Continuous Gain Range –14dB to 17dB
LTC554x 600MHz to 4GHz Downconverting Mixer Family 8dB Gain, >25dBm IIP3, 10dB NF, 3.3V/200mA Supply
LT5554 Ultralow Distort IF Digital VGA 48dBm OIP3 at 200MHz, 2dB to 18dB Gain Range, 0.125dB Gain Steps
LT5578 400MHz to 2.7GHz Upconverting Mixer 27dBm OIP3 at 900MHz, 24.2dBm at 1.95GHz, Integrated RF Transformer
LT5579 1.5GHz to 3.8GHz Upconverting Mixer 27.3dBm OIP3 at 2.14GHz, NF = 9.9dB, 3.3V Supply, Single-Ended LO and RF Ports
RF Power Detectors
LT5581 6GHz Low Power RMS Detector 40dB Dynamic Range, ±1dB Accuracy Over Temperature, 1.5mA Supply Current
LTC5582 10GHz RMS Power Detector 40MHz to 10GHz, Up to 57dB Dynamic Range, ±0.5dB Accuracy Over Temperature
LTC5583 Dual 6GHz RMS Power Detector 40MHz to 6GHz, Up to 60dB Dynamic Range, >40dB Channel-to-Channel Isolation
ADCs
LTC2285 14-Bit, 125Msps Dual ADC 72.4dB SNR, >88dB SFDR, 790mW Power Consumption
LTC2185 16-Bit, 125Msps Dual ADC Ultralow Power 74.8dB SNR, 185mW/Channel Power Consumption
LTC2242-12 12-Bit, 250Msps ADC 65.4dB SNR, 78dB SFDR, 740mW Power Consumption
Conversion Gain, NF and IIP3
vs RF Frequency
RF FREQUENCY (MHz)
2100
6
7
8
9
GC (dB), SSB NF (dB)
IIP3 (dBm)
11
12
13
14
2200 2400
5592 TA02b
10
2300 2500 2600 2700
23
25
27
29
24
26
28
22
21
TA = 25°C
IF = 470MHz
LOW SIDE LO
NF
IIP3
GC
4:1
TC4-1W-17LN+
IFA
50Ω
82nH 82nH
22pF
1nF
1µF
22pF 1µF
LTC5592
CHANNEL A
CHANNEL B NOT SHOWN
1
192021222324
LO
50Ω
17
18
16
15
2.2pF
4
3
RFA
50Ω
VCCIF
3.3V
VCC
3.3V
TO
CHANNEL B
TO
CHANNEL B
22pF
2
IFGNDAGND IFA+IFA–IFBA
LO
GND
ISEL
ENA
VCCA
RFA
CTA
GND
GND
5590 TA02
ISEL
ENA
4.7pF