ANALOG DEVICES ADL5387 Service Manual
50 MHz to 2 GHz
FEATURES
Operating RF frequency
50 MHz to 2 GHz
LO input at 2 × f
100 MHz to 4 GHz
Input IP3: 31 dBm @ 900 MHz
Input IP2: 62 dBm @ 900 MHz
Input P1dB: 13 dBm @ 900 MHz
Noise figure (NF)
12.0 dB @ 140 MHz
14.7 dB @ 900 MHz
Voltage conversion gain > 4 dB
Quadrature demodulation accuracy
Phase accuracy ~0.4°
Amplitude balance ~0.05 dB
Demodulation bandwidth ~240 MHz
Baseband I/Q drive 2 V p-p into 200 Ω
Single 5 V supply
LO
Quadrature Demodulator
ADL5387
FUNCTIONAL BLOCK DIAGRAM
24
23 22 21 20 19
CMRF CMRF RFIP RFIN CMRF VPX
1
VPA
2
COM
3
BIAS
4
VPL
5
VPL
6
VPL
CML
789101112
DIVIDE-BY-2
PHASE SPLITTER
LOIP LOIN CML CML COM
Figure 1.
VPB
VPB
QHI
QLO
IHI
ILO
18
17
16
15
14
13
06764-001
APPLICATIONS
QAM/QPSK RF/IF demodulators
W-CDMA/CDMA/CDMA2000/GSM
Microwave point-to-(multi)point radios
Broadband wireless and WiMAX
Broadband CATVs
GENERAL DESCRIPTION
The ADL5387 is a broadband quadrature I/Q demodulator that
covers an RF/IF input frequency range from 50 MHz to 2 GHz.
With a NF = 13.2 dB, IP1dB = 12.7 dBm, and IIP3 = 32 dBm @
450 MHz, the ADL5387 demodulator offers outstanding dynamic
range suitable for the demanding infrastructure direct-conversion
requirements. The differential RF/IF inputs provide a wellbehaved broadband input impedance of 50 and are best
driven from a 1:1 balun for optimum performance.
Ultrabroadband operation is achieved with a divide-by-2 method
for local oscillator (LO) quadrature generation. Over a wide
range of LO levels, excellent demodulation accuracy is
achieved with amplitude and phase balances ~0.05 dB and
~0.4°, respectively. The demodulated in-phase (I) and
quadrature (Q) differential outputs are fully buffered and
provide a voltage conversion gain of >4 dB. The buffered
baseband outputs are capable of driving a 2 V p-p differential
signal into 200 .
The fully balanced design minimizes effects from second-order
distortion. The leakage from the LO port to the RF port is
<−70 dBc. Differential dc-offsets at the I and Q outputs are
<10 mV. Both of these factors contribute to the excellent IIP2
specifications > 60 dBm.
The ADL5387 operates off a single 4.75 V to 5.25 V supply. The
supply current is adjustable with an external resistor from the
BIAS pin to ground.
The ADL5387 is fabricated using the Analog Devices, Inc.
advanced silicon-germanium bipolar process and is available in
a 24-lead exposed paddle LFCSP.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2007 Analog Devices, Inc. All rights reserved.
ADL5387
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
ESD Caution.................................................................................. 5
Pin Configuration and Function Descriptions............................. 6
Typical Performance Characteristics ............................................. 7
Distributions for f
Distributions for f
Distributions for f
Distributions for f
= 140 MHz............................................... 10
RF
= 450 MHz............................................... 11
RF
= 900 MHz............................................... 12
RF
= 1900 MHz............................................. 13
RF
Circuit Description......................................................................... 14
LO Interface................................................................................. 14
V-to-I Converter......................................................................... 14
Mixers .......................................................................................... 14
Emitter Follower Buffers ........................................................... 14
Bias Circuit .................................................................................. 14
Applications..................................................................................... 15
Basic Connections...................................................................... 15
Power Supply............................................................................... 15
Local Oscillator (LO) Input ...................................................... 15
RF Input....................................................................................... 16
Baseband Outputs ...................................................................... 16
Error Vector Magnitude (EVM) Performance....................... 17
Low IF Image Rejection............................................................. 18
Example Baseband Interface..................................................... 18
Characterization Setups................................................................. 21
Evaluation Board ............................................................................ 23
Outline Dimensions ....................................................................... 26
Ordering Guide .......................................................................... 26
REVISION HISTORY
10/07—Revision 0: Initial Version
Rev. 0 | Page 2 of 28
ADL5387
SPECIFICATIONS
VS = 5 V, TA = 25°C, fRF = 900 MHz, fIF = 4.5 MHz, PLO = 0 dBm, BIAS pin open, ZO = 50 Ω, unless otherwise noted, baseband outputs
differentially loaded with 450 Ω.
Table 1.
Parameter Condition Min Typ Max Unit
OPERATING CONDITIONS
LO Frequency Range External input = 2xLO frequency 0.1 4 GHz
RF Frequency Range 0.05 2 GHz
LO INPUT LOIP, LOIN
Input Return Loss
LO Input Level −6 0 +6 dBm
I/Q BASEBAND OUTPUTS QHI, QLO, IHI, ILO
Voltage Conversion Gain
Demodulation Bandwidth 1 V p-p signal 3 dB bandwidth 240 MHz
Quadrature Phase Error @ 900 MHz 0.4 Degrees
I/Q Amplitude Imbalance 0.1 dB
Output DC Offset (Differential) 0 dBm LO input ±5 mV
Output Common-Mode VPOS − 2.8 V
0.1 dB Gain Flatness 40 MHz
Output Swing Differential 200 Ω load 2 V p-p
Peak Output Current Each pin 12 mA
POWER SUPPLIES VPA, VPL, VPB, VPX
Voltage 4.75 5.25 V
Current BIAS pin open 180 mA
RBIAS = 4 kΩ 157 mA
DYNAMIC PERFORMANCE @ RF = 140 MHz RFIP, RFIN
Conversion Gain 4.7 dB
Input P1dB (IP1dB) 13 dBm
Second-Order Input Intercept (IIP2) −5 dBm each input tone 67 dBm
Third-Order Input Intercept (IIP3) −5 dBm each input tone 31 dBm
LO to RF
RF to LO LOIN, LOIP terminated in 50 Ω −95 dBc
I/Q Magnitude Imbalance 0.05 dB
I/Q Phase Imbalance 0.2 Degrees
LO to I/Q
Noise Figure 12.0 dB
Noise Figure under Blocking Conditions With a −5 dBm interferer 5 MHz away 14.4 dB
AC-coupled into LOIP with LOIN bypassed,
measured at 2 GHz
450 Ω differential load on I and Q outputs
(@ 900 MHz)
200 Ω differential load on I and Q outputs
(@ 900 MHz)
RFIN, RFIP terminated in 50 Ω, 1xLO
appearing at the RF port
RFIN, RFIP terminated in 50 Ω, 1xLO
appearing at the BB port
−10 dB
4.3 dB
3.2 dB
−100 dBm
−39 dBm
Rev. 0 | Page 3 of 28
ADL5387
Parameter Condition Min Typ Max Unit
DYNAMIC PERFORMANCE @ RF = 450 MHz
Conversion Gain 4.4 dB
Input P1dB (IP1dB) 12.7 dBm
Second-Order Input Intercept (IIP2) −5 dBm each input tone 69.2 dBm
Third-Order Input Intercept (IIP3) −5 dBm each input tone 32.8 dBm
LO to RF
RF to LO LOIN, LOIP terminated in 50 Ω −90 dBc
I/Q Magnitude Imbalance 0.05 dB
I/Q Phase Imbalance 0.6 Degrees
LO to I/Q
Noise Figure 13.2 dB
DYNAMIC PERFORMANCE @ RF = 900 MHz
Conversion Gain 4.3 dB
Input P1dB (IP1dB) 12.8 dBm
Second-Order Input Intercept (IIP2) −5 dBm each input tone 61.7 dBm
Third-Order Input Intercept (IIP3) −5 dBm each input tone 31.2 dBm
LO to RF
RF to LO LOIN, LOIP terminated in 50 Ω −88 dBc
I/Q Magnitude Imbalance 0.05 dB
I/Q Phase Imbalance 0.2 Degrees
LO to I/Q
Noise Figure 14.7 dB
Noise Figure under Blocking Conditions With a −5 dBm interferer 5 MHz away 15.8 dB
DYNAMIC PERFORMANCE @ RF = 1900 MHz
RFIN, RFIP terminated in 50 Ω, 1xLO
appearing at the RF port
RFIN, RFIP terminated in 50 Ω, 1xLO
appearing at the BB port
RFIN, RFIP terminated in 50 Ω, 1xLO
appearing at the RF port
RFIN, RFIP terminated in 50 Ω,
1XLO appearing at the BB port
−87 dBm
−38 dBm
−79 dBm
−41 dBm
Conversion Gain 3.8 dB
Input P1dB (IP1dB) 12.8 dBm
Second-Order Input Intercept (IIP2) −5 dBm each input tone 59.8 dBm
Third-Order Input Intercept (IIP3) −5 dBm each input tone 27.4 dBm
LO to RF
RF to LO LOIN, LOIP terminated in 50 Ω −70 dBc
I/Q Magnitude Imbalance 0.05 dB
I/Q Phase Imbalance 0.3 Degrees
LO to I/Q
Noise Figure 16.5 dB
Noise Figure under Blocking Conditions With a −5 dBm interferer 5 MHz away 18.7 dB
RFIN, RFIP terminated in 50 Ω, 1xLO
appearing at the RF port
RFIN, RFIP terminated in 50 Ω, 1xLO
appearing at the BB port
−75 dBm
−43 dBm
Rev. 0 | Page 4 of 28
ADL5387
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Rating
Supply Voltage VPOS1, VPOS2, VPOS3 5.5 V
LO Input Power 13 dBm (re: 50 Ω)
RF/IF Input Power 15 dBm (re: 50 Ω)
Internal Maximum Power Dissipation 1100 mW
θ
JA
Maximum Junction Temperature 150°C
Operating Temperature Range −40°C to +85°C
Storage Temperature Range −65°C to +125°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
54°C/W
ESD CAUTION
Rev. 0 | Page 5 of 28
ADL5387
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
24
23 22 21 20 19
CMRF CMRF RFIP
1
VPA
RFIN CMRF VPX
VPB
18
2
COM
3
BIAS
VPB
QHI
17
16
ADL5387
4
VPL
5
VPL
6
VPL
CML
789101112
TOP VIEW
(Not to Scale)
LOIP L OIN CML CML COM
QLO
IHI
ILO
15
14
13
06764-002
Figure 2. Pin Configuration
Table 3. Pin Function Descriptions
Pin No. Mnemonic Description
1, 4 to 6,
17 to 19
2, 7, 10 to 12,
VPA, VPL, VPB, VPX
Supply. Positive supply for LO, IF, biasing and baseband sections, respectively. These pins should
be decoupled to board ground using appropriate sized capacitors.
COM, CML, CMRF Ground. Connect to a low impedance ground plane.
20, 23, 24
3 BIAS
Bias Control. A resistor can be connected between BIAS and COM to reduce the mixer core current.
The default setting for this pin is open.
8, 9 LOIP, LOIN
Local Oscillator. External LO input is at 2xLO frequency. A single-ended LO at 0 dBm can be applied
through a 1000 pF capacitor to LOIP. LOIN should be ac-grounded, also using a 1000 pF. These inputs
can also be driven differentially through a balun (recommended balun is M/A-COM ETC1-1-13).
13 to 16 ILO, IHI, QLO, QHI
I-Channel and Q-Channel Mixer Baseband Outputs. These outputs have a 50 Ω differential output
impedance (25 Ω per pin). The bias level on these pins is equal to VPOS − 2.8 V. Each output pair can
swing 2 V p-p (differential) into a load of 200 Ω. Output 3 dB bandwidth is 240 MHz.
21, 22 RFIN, RFIP
RF Input. A single-ended 50 Ω signal can be applied to the RF inputs through a 1:1 balun (recommended
balun is M/A-COM ETC1-1-13). Ground-referenced inductors must also be connected to RFIP and
RFIN (recommended values = 120 nH).
EP Exposed Paddle. Connect to a low impedance ground plane
Rev. 0 | Page 6 of 28
ADL5387
TYPICAL PERFORMANCE CHARACTERISTICS
VS = 5 V, TA = 25°C, LO drive level = 0 dBm, R
20
TA = –40°C
TA = +25°C
TA = +85°C
15
10
GAIN (dB), IP1dB (dBm)
5
INPUT P1dB
GAIN
= open, unless otherwise noted.
BIAS
5
NORMALIZED TO 1MHz
0
–5
–10
–15
BB RESPONSE (dB)
–20
–25
0
0 200 400 600 800 1000 1200 1400 1600 1800 2000
RF FREQUENCY ( MHz)
Figure 3. Conversion Gain and Input 1 dB Compression Point (IP1dB) vs.
RF Frequency
80
70
60
50
40
IIP2, IIP3 (dBm)
30
20
10
0 200 400 600 800 1000 1200 1400 1600 1800 2000
INPUT IP2
INPUT IP3
(I AND Q CHANNELS)
RF FREQUENCY (M Hz)
I CHANNEL
Q CHANNEL
TA = +85°C
TA = +25°C
TA = –40°C
Figure 4. Input Third-Order Intercept (IIP3) and
Input Second-Order Intercept Point (IIP2) vs. RF Frequency
2.0
TA = –40°C
TA = +25°C
1.5
TA = +85°C
1.0
–30
1 100010010
06764-003
BB FREQUENCY (MHz)
06764-006
Figure 6. Normalized I/Q Baseband Frequency Response
19
TA = –40°C
TA = +25°C
TA = +85°C
17
15
13
11
NOISE FI GURE (dB)
9
7
0 200 400 600 800 1000 1200 1400 1600 1800 2000
06764-004
RF FREQUENCY ( MHz)
06764-007
Figure 7. Noise Figure vs. RF Frequency
4
TA = –40°C
TA = +25°C
3
TA = +85°C
2
0.5
0
–0.5
MAGNITUDE ERRO R (dB)
–1.0
–1.5
–2.0
0 200 400 600 800 1000 1200 1400 1600 1800 2000
RF FREQUENCY ( MHz)
Figure 5. I/Q Gain Mismatch vs. RF Frequency
06764-005
Rev. 0 | Page 7 of 28
1
0
–1
–2
–3
QUADRATURE PHASE ERRO R (Degrees)
–4
0 200 400 600 800 1000 1200 1400 1600 1800 2000
RF FREQUENCY ( MHz)
Figure 8. I/Q Quadrature Phase Error vs. RF Frequency
06764-008
ADL5387
20
INPUT IP2, Q CHANNEL
80
20
INPUT IP2, I CHANNEL
80
NOISE FI GURE
15
10
GAIN (dB), INPUT P1dB (dBm), NOISE FIGURE (dB)
INPUT IP2, I CHANNEL
INPUT P1dB
NOISE FIGURE
GAIN
5
0
–6–5–4–3–2–10123456
INPUT IP3
LO LEVEL (dBm)
Figure 9. Conversion Gain, Noise Figure, IIP3, IIP2, and IP1dB vs.
LO Level, f
32
TA = –40°C
TA = +25°C
TA = +85°C
28
INPUT IP3
24
20
16
12
IIP3 (dBm) AND NO ISE FI GURE (dB)
= 140 MHz
RF
SUPPLY
CURRENT
NOISE FI GURE
65
50
35
20
195
185
175
165
155
145
15
INPUT IP2, Q CHANNEL
10
GAIN
INPUT IP2, INPUT IP3 (dBm)
06764-009
5
GAIN (dB), INPUT P1dB (dBm), NOISE FIGURE (dB)
0
–6–5–4–3–2–10123456
INPUT IP3
INPUT P1dB
LO LEVEL (dBm)
65
50
35
INPUT IP2, INPUT IP3 (dBm)
20
06764-012
Figure 12. Conversion Gain, Noise Figure, IIP3, IIP2, and IP1dB vs.
LO Level, f
32
TA = –40°C
TA = +25°C
TA = +85°C
28
24
20
SUPPLY CURRENT (mA)
16
12
IIP3 (dBm) AND NO ISE FI GURE (dB)
= 900 MHz
RF
NOISE FIGURE
INPUT IP3
8
1 10 100
R
(kΩ)
BIAS
Figure 10. Noise Figure, IIP3, and Supply Current vs. R
25
20
R
= 100kΩ
15
10
NOISE FIGURE (dB)
5
0
–30 50–5–10–15–20–25
BIAS
R
= 10kΩ
BIAS
R
= 4kΩ
BIAS
R
= 1.4kΩ
BIAS
RF BLOCKER INP UT POWER ( dBm)
Figure 11. Noise Figure vs. Input Blocker Level, f
(RF Blocker 5 MHz Offset)
, fRF = 140 MHz
BIAS
= 900 MHz
RF
135
8
110
06764-010
Figure 13. IIP3 and Noise Figure vs. R
R
(kΩ)
BIAS
, fRF = 900 MHz
BIAS
100
06764-013
80
70
60
50
40
30
20
10
GAIN (dB), IP1dB, IIP2, I AND Q CHANNELS (d Bm)
0
110
06764-011
Figure 14. Conversion Gain, IP1dB, IIP2 I Channel, and IIP2 Q Channel vs. R
140MHz: GAIN
140MHz: IP1d B
140MHz: IIP2, I CHANNEL
140MHz: IIP2, Q CHANNEL
450MHz: GAIN
450MHz: IP1d B
450MHz: IIP2, I CHANNEL
450MHz: IIP2, Q CHANNEL
R
(kΩ)
BIAS
100
06764-014
BIAS
Rev. 0 | Page 8 of 28
ADL5387
–
–
35
80
20
30
25
20
IP1dB, IIP3 (dBm)
15
10
TA = –40°C
TA = +25°C
TA = +85°C
5
05
IIP3
IP1dB
BB FREQUENCY (MHz)
INPUT IP2,
I CHANNEL
INPUT IP2,
Q CHANNEL
75
70
65
60
55
INPUT IP2, I AND Q CHANNELS (dBm)
50
045403530252015105
06764-015
Figure 15. IIIP3, IIP2, IP1dB vs. Baseband Frequency
–30
–40
–50
–60
–70
LO LEAKAGE (dBm)
–80
–90
–100
0 200018001600140012001000800600400200
Figure 18. LO-to-RF Leakage vs. Internal 1xLO Frequency
0
–10
–20
–30
–40
–50
FEEDTHROUG H (dBm)
–60
–70
1xLO (INT ERNAL)
2xLO (EXT ERNAL)
LEAKAGE (dBc)
–100
20
–40
–60
–80
1xLO
2xLO
INTERNAL 1xL O FREQUENCY (MHz)
06764-018
–80
0 200018001600140012001000800600400200
INTERNAL 1xL O FREQUE NCY (MHz)
06764-016
Figure 16. LO-to-BB Feedthrough vs. 1xLO Frequency (Internal LO Frequency)
0
–5
–10
–15
RETURN LOSS ( dB)
–20
–25
0 200018001600140012001000800600400200
RF FREQUENCY ( MHz)
06764-017
Figure 17. RF Port Return Loss vs. RF Frequency, Measured on
Characterization Board through ETC1-1-13 Balun with 120 nH Bias Inductors
–120
RETURN LOSS ( dB)
–10
–15
–20
–25
–30
0 200018001600140012001000800600400200
RF FREQUENCY ( MHz)
Figure 19. RF-to-LO Leakage vs. RF Frequency
0
–5
0 4000350030002500200015001000500
FREQUENCY (MHz )
Figure 20. Single-Ended LO Port Return Loss vs.
LO Frequency, LOIN AC-Coupled to Ground
06764-019
06764-020
Rev. 0 | Page 9 of 28
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