ANALOG DEVICES ADL5385 Service Manual
50 MHz to 2200 MHz
FEATURES
Output frequency range: 50 MHz to 2200 MHz
1 dB output compression: 11 dBm @ 350 MHz
Noise floor: –159 dBm/Hz @ 350 MHz
Sideband suppression: −50 dBc @ 350 MHz
Carrier feedthrough: −46 dBm @ 350 MHz
Single supply: 4.75 V to 5.5 V
24-lead, Pb-free LFCSP_VQ with exposed paddle
APPLICATIONS
Radio-link infrastructure
Cable modem termination systems
Wireless infrastructure systems
Wireless local loop
WiMAX/broadband wireless access systems
PRODUCT DESCRIPTION
The ADL5385 is a silicon, monolithic, quadrature modulator
designed for use from 50 MHz to 2200 MHz. Its excellent phase
accuracy and amplitude balance enable both high performance
intermediate frequency (IF) and direct radio frequency (RF)
modulation for communication systems.
The AD5385 takes the signals from two differential baseband
inputs and modulates them onto two carriers in quadrature
with each other. The two internal carriers are derived from
a single-ended, external local oscillator input signal at twice the
frequency as the desired carrier output. The two modulated
signals are summed together in a differential-to-single-ended
amplifier designed to drive 50 Ω loads.
Quadrature Modulator
ADL5385
FUNCTIONAL BLOCK DIAGRAM
ENBL
BIAS
IBBP
IBBN
LOIP
DIVIDE-BY-2
QUADRATURE
LOIN
QBBP
QBBN
SPLITTER
The ADL5385 can be used as either an IF or a direct-to-RF
modulator in digital communication systems. The wide
baseband input bandwidth allows for either baseband drive or
drive from a complex IF. Typical applications are in radio-link
transmitters, cable modem termination systems, and broadband
wireless access systems.
The ADL5385 is fabricated using the Analog Devices, Inc.,
advanced silicon germanium bipolar process and is packaged in
a 24-lead, Pb-free LFCSP_VQ with exposed paddle.
Performance is specified over –40°C to +85°C. A Pb-free
evaluation board is also available.
PHASE
Figure 1.
TEMPERATURE
SENSOR
TEMP
VOUT
6118-001
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 ©2006 Analog Devices, Inc. All rights reserved.
ADL5385
TABLE OF CONTENTS
Features.............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
Product Description......................................................................... 1
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 6
ESD Caution.................................................................................. 6
Pin Configuration and Functional Descriptions.......................... 7
Typical Performance Characteristics ............................................. 8
Circuit Description......................................................................... 12
Overview...................................................................................... 12
LO Interface................................................................................. 12
V-to-I Converter......................................................................... 12
Mixers .......................................................................................... 12
D-to-S Amplifier......................................................................... 12
Bias Circuit.................................................................................. 12
Basic Connections .......................................................................... 13
Optimization............................................................................... 13
Applications..................................................................................... 15
DAC Modulator Interfacing ..................................................... 15
155 Mbps (STM-1) 128 QAM Transmitter............................. 16
CMTS Transmitter Application................................................ 16
Spectral Products from Harmonic Mixing............................. 17
RF Second-Order Products....................................................... 17
LO Generation Using PLLs ....................................................... 18
Transmit DAC Options ............................................................. 18
Modulator/Demodulator Options ........................................... 18
Evaluation Board............................................................................ 19
Characterization Setup .................................................................. 21
SSB Setup..................................................................................... 21
Outline Dimensions....................................................................... 22
Ordering Guide .......................................................................... 22
REVISION HISTORY
10/06—Revision 0: Initial Version
Rev. 0 | Page 2 of 24
ADL5385
SPECIFICATIONS
Unless otherwise noted, VS = 5 V; TA = 25°C; LO = −7 dBm; I/Q inputs = 1.4 V p-p differential sine waves in quadrature on a 500 mV dc
bias; baseband frequency = 1 MHz; LO source and RF output load impedances are 50 Ω.
Table 1.
Parameter Conditions Min Typ Max Unit
OUTPUT FREQUENCY RANGE 50 2200 MHz
EXTERNAL LO FREQUENCY
RANGE
OUTPUT FREQUENCY = 50 MHz
Output Power Single (lower) sideband output 4 5.6 8 dBm
Output P1 dB 11 dBm
Carrier Feedthrough Unadjusted (nominal drive level) −57 dBm
@ +85°C after optimization at +25°C −67 dBm
@ −40°C after optimization at +25°C −67 dBm
Sideband Suppression Unadjusted (nominal drive level) −57 dBc
@ +85°C after optimization at +25°C −64 dBc
@ −40°C after optimization at +25°C −68 dBc
Second Baseband Harmonic (FLO − (2 × FBB)), P
Third Baseband Harmonic (FLO + (3 × FBB)), P
Output IP2 F1 = +3.5 MHz, F2 = +4.5 MHz, P
Output IP3 F1 = +3.5 MHz, F2 = +4.5 MHz, P
Quadrature Phase Error −0.17 degrees
I/Q Amplitude Balance −0.03 dB
Noise Floor 20 MHz offset from LO, all BB inputs at a bias of 500 mV −155 dBm/Hz
20 MHz offset from LO, output power = −5 dBm −150 dBm/Hz
Output Return Loss −19 dB
OUTPUT FREQUENCY = 140 MHz
Output Power Single (lower) sideband output 5.7 dBm
Output P1 dB 11 dBm
Carrier Feedthrough Unadjusted (nominal drive level) −52 dBm
@ +85°C after optimization at +25°C −66 dBm
@ −40°C after optimization at +25°C −67 dBm
Sideband Suppression Unadjusted (nominal drive level) −53 dBc
@ +85°C after optimization at +25°C −63 dBc
@ −40°C after optimization at +25°C −68 dBc
Second Baseband Harmonic (FLO − (2 × FBB)), P
Third Baseband Harmonic (FLO + (3 × FBB)), P
Output IP2 F1 = +3.5 MHz, F2 = +4.5 MHz, P
Output IP3 F1 = +3.5 MHz, F2 = +4.5 MHz, P
Quadrature Phase Error −0.33 degrees
I/Q Amplitude Balance −0.03 dB
Noise Floor 20 MHz offset from LO, all BB inputs at a bias of 500 mV −160 dBm/Hz
Output Return Loss −20 dB
OUTPUT FREQUENCY = 350 MHz
Output Power Single (lower) sideband output 3 5.6 7 dBm
Output P1 dB 11 dBm
Carrier Feedthrough Unadjusted (nominal drive level) −46 dBm
@ +85°C after optimization at +25°C −65 dBm
@ −40°C after optimization at +25°C −66 dBm
Sideband Suppression Unadjusted (nominal drive level) −50 dBc
@ +85°C after optimization at +25°C −63 dBc
@ −40°C after optimization at+25°C −61 dBc
External LO frequency is twice output frequency 100 4400 MHz
= 5 dBm −83 dBc
OUT
= 5 dBm −58 dBc
OUT
= −3 dBm per tone 69 dBm
OUT
= −3 dBm per tone 26 dBm
OUT
= 5 dBm −83 dBc
OUT
= 5 dBm −57 dBc
OUT
= −3 dBm per tone 70 dBm
OUT
=−3 dBm per tone 26 dBm
OUT
Rev. 0 | Page 3 of 24
ADL5385
Parameter Conditions Min Typ Max Unit
Second Baseband Harmonic (FLO − (2 × FBB)), P
Third Baseband Harmonic (FLO + (3 × FBB)), P
Output IP2 F1 = 3.5 MHz, F2 = 4.5 MHz, P
Output IP3 F1 = 3.5 MHz, F2 = 4.5 MHz, P
Quadrature Phase Error 0.39 degrees
I/Q Amplitude Balance −0.03 dB
Noise Floor 20 MHz offset from LO, all BB inputs at a bias of 500 mV −159 dBm/Hz
20 MHz offset from LO, output power = −5 dBm −157 dBm/Hz
Output Return Loss −21 dB
OUTPUT FREQUENCY = 860 MHz
Output Power Single (lower) sideband output 2.5 5.3 6.5 dBm
Output P1 dB 11 dBm
Carrier Feedthrough Unadjusted (nominal drive level) −41 −35 dBm
@ +85°C after optimization at +25°C −63 dBm
@ −40°C after optimization at +25°C −65 dBm
Sideband Suppression Unadjusted (nominal drive level) −41 −35 dBc
@ +85°C after optimization at +25°C −58 dBc
@ −40°C after optimization at +25°C −59 dBc
Second Baseband Harmonic (FLO − (2 × FBB)), P
Third Baseband Harmonic (FLO + (3 × FBB)), P
Output IP2 F1 = +3.5 MHz, F2 = +4.5 MHz, P
Output IP3 F1 = +3.5 MHz, F2 = +4.5 MHz, P
Quadrature Phase Error 0.67 degrees
I/Q Amplitude Balance −0.03 dB
Noise Floor 20 MHz offset from LO, all BB inputs at a bias of 500 mV −159 dBm/Hz
20 MHz offset from LO, output power = −5 dBm −157 dBm/Hz
Output Return Loss −19 dB
OUTPUT FREQUENCY =
1450 MHz
Output Power Single (lower) sideband output 4.4 dBm
Output P1 dB 10 dBm
Carrier Feedthrough Unadjusted (nominal drive level) −36 dBm
@ +85°C after optimization at +25°C −50 dBm
@ −40°C after optimization at +25°C −50 dBm
Sideband Suppression Unadjusted (nominal drive level) −44 dBc
@ +85°C after optimization at +25°C −61 dBc
@ −40°C after optimization at +25°C −51 dBc
Second Baseband Harmonic (F
− (2 × FBB)), P
LO
Third Baseband Harmonic (FLO + (3 × FBB)), P
Output IP2 F1 = 3.5 MHz, F2 = 4.5 MHz, P
Output IP3 F1 = 3.5 MHz, F2 = 4.5 MHz, P
Quadrature Phase Error 0.42 degrees
I/Q Amplitude Balance −0.02 dB
Noise Floor 20 MHz offset from LO, all BB inputs at a bias of 500 mV −160 dBm/Hz
Output Return Loss −33 dB
OUTPUT FREQUENCY =
1900 MHz
Output Power Single (lower) sideband output 3.4 dBm
Output P1 dB 9 dBm
Carrier Feedthrough Unadjusted (nominal drive level) −35 dBm
@ +85°C after optimization at +25°C −51 dBm
@ −40°C after optimization at +25°C −51 dBm
Sideband Suppression Unadjusted (nominal drive level) −33 dBc
= 5 dBm −80 dBc
OUT
= 5 dBm −53 dBc
OUT
= −3 dBm per tone 71 dBm
OUT
= −3 dBm per tone 26 dBm
OUT
= 5 dBm −73 −57 dBc
OUT
= 5 dBm −50 −45 dBc
OUT
= −3 dBm per tone 70 dBm
OUT
= −3 dBm per tone 25 dBm
OUT
= 4 dBm −64 dBc
OUT
= 4 dBm −52 dBc
OUT
= −3 dBm per tone 63 dBm
OUT
= −3 dBm per tone 24 dBm
OUT
Rev. 0 | Page 4 of 24
ADL5385
Parameter Conditions Min Typ Max Unit
@ +85°C after optimization at +25°C −43 dBc
@ −40°C after optimization at +25°C −47 dBc
Second Baseband Harmonic (FLO − (2 × FBB)), P
Third Baseband Harmonic (FLO + (3 × FBB)), P
Output IP2 F1 = +3.5 MHz, F2 = +4.5 MHz, P
Output IP3 F1 = +3.5 MHz, F2 = +4.5 MHz, P
Quadrature Phase Error 2.6 degrees
I/Q Amplitude Balance 0.003 dB
Noise Floor 20 MHz offset from LO, all BB inputs at a bias of 500 mV −160 dBm/Hz
20 MHz offset from LO, output power = −5 dBm −156 dBm/Hz
Output Return Loss −20 dB
OUTPUT FREQUENCY =
2150 MHz
Output Power Single (lower) sideband output 2.6 dBm
Output P1 dB 8 dBm
Carrier Feedthrough Unadjusted (nominal drive level) −36 dBm
@ +85°C after optimization at +25°C −47 dBm
@ −40°C after optimization at +25°C −48 dBm
Sideband Suppression Unadjusted (nominal drive level) −37 dBc
Second Baseband Harmonic (FLO − (2 × FBB)), P
Third Baseband Harmonic (FLO + (3 × FBB)), P
Output IP2 F1 = +3.5 MHz, F2 = +4.5 MHz, P
Output IP3 F1 = +3.5 MHz, F2 = +4.5 MHz, P
Quadrature Phase Error 1.5 degrees
I/Q Amplitude Balance < 0.05 dB
Noise Floor 20 MHz offset from LO, all BB inputs at a bias of 500 mV −160 dBm/Hz
20 MHz offset from LO, output power = −5 dBm −156 dBm/Hz
Output Return Loss −15 dB
LO INPUTS Pin LOIP and Pin LOIN
LO Drive Level Characterization performed at typical level −10 –7 +5 dBm
Input Impedance 50 Ω
Input Return Loss 350 MHz, LOIN ac-coupled to ground −20 dB
BASEBAND INPUTS Pin IBBP, Pin IBBN, Pin QBBP, Pin QBBN
I and Q Input Bias Level 500 mV
Input Bias Current −70 µA
Bandwidth (0.1 dB) RF = 500 MHz, output power = 0 dBm 80 MHz
Bandwidth (3 dB) RF = 500 MHz, output power = 0 dBm >500 MHz
ENABLE INPUT ENBL
Turn-On Settling Time ENBL = high (for output to within 0.5 dB of final value) 1.0 µs
Turn-Off Settling Time ENBL = low (at supply current falling below 20 mA) 1.4 µs
ENBL High Level (Logic 1) 1.5 V
ENBL Low Level (Logic 0) 0.4 V
TEMPERATURE OUTPUT TEMP
Output Voltage
Temperature Slope
= 27.15°C, 300K, RL = 1 MΩ (after full warmup)
T
A
−40°C ≤ T
≤ +85°C, RL = 1 MΩ
A
Output Impedance 1.0 kΩ
POWER SUPPLIES Pin VPS1 and Pin VPS2
Voltage 4.75 5.5 V
Supply Current ENBL = high 215 240 mA
ENBL = low 80 µA
= 3 dBm −58 dBc
OUT
= 3 dBm −47 dBc
OUT
= −3 dBm per tone 57 dBm
OUT
= −3 dBm per tone 22 dBm
OUT
= 2.6 dBm −56 dBc
OUT
= 2.6 dBm −45 dBc
OUT
= −3 dBm per tone 54 dBm
OUT
= −3 dBm per tone 21 dBm
OUT
1.56 V
4.6
mV/°C
Rev. 0 | Page 5 of 24
ADL5385
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Rating
Supply Voltage VPOS 5.5 V
IBBP, IBBN, QBBP, QBBN Range 0 V to 2.0 V
LOIP and LOIN 13 dBm
Internal Power Dissipation 1.375 W
θJA (Exposed Paddle Soldered Down) 58°C/W
Maximum Junction Temperature 164°C
Operating Temperature Range −40°C to +85°C
Storage Temperature Range −65°C to +150°C
ESD CAUTION
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.
Rev. 0 | Page 6 of 24
ADL5385
PIN CONFIGURATION AND FUNCTIONAL DESCRIPTIONS
24 VPS3
23 VPS3
22 LOIN
21 LOIP
20 COM3
19 COM3
PIN 1
INDICATOR
1NC
2NC
3NC
EXPOSED
PADDLE
4COM1
5COM1
6COM1
9
7
8
OUT
VPS1
VPS1
V
ADL5385
4 × 4 LFCSP
NC = NO CONNECT
Figure 2. Pin Configuration
Table 3. Pin Function Descriptions
Pin No. Mnemonic Description
1, 2, 3 NC No Connection. These pins can be left open or tied to ground.
4, 5, 6, 15,
16, 19, 20
COM1, COM2,
COM3
Power Supply Common Pins. COM1, COM2, and COM3 must all be connected to a ground plane via a
low impedance path.
7 VOUT Device Output. Single-ended, 50 Ω internally biased RF/IF output; pin must be ac-coupled to the load.
8, 9, 11, 23,
24
VPS1, VPS2,
VPS3
Power Supply Pins. Decouple each pin with a 0.1 F capacitor; Pin 8 and Pin 9 can share a single
capacitor, as can Pin 23 and Pin 24. All pins must be connected to the same supply (V
10 TEMP Temperature Sensor Output. Provides dc voltage proportional to die temperature. Slope is 4.6 mV/°C
12 ENBL
Device Enable. Shuts device down when grounded and enables device when pulled to supply
voltage.
13, 14, 17,
18
IBBP, IBBN,
QBBN, QBBP
Differential In-Phase and Quadrature Baseband Inputs. These high impedance inputs must be
externally dc-biased to 500 mV dc and driven from a low impedance source. Nominal characterized
ac signal swing is 700 mV p-p on each pin (150 mV to 850 mV). This results in a differential drive of
1.4 V p-p with a 500 mV dc bias.
21 LOIP
Single-Ended Two-Times Local Oscillator Input. This input is internally biased and must be
ac-coupled to the LO source.
22 LOIN Common for LO Input. Must be ac-coupled to ground through a low impedance path.
18 Q BBP
17 Q BBN
16 CO M2
15 CO M2
14 I BBN
13 I BBP
11
12
10
VPS2
ENBL
TEMP
6118-002
).
s
Rev. 0 | Page 7 of 24
ADL5385
–
R
TYPICAL PERFORMANCE CHARACTERISTICS
Unless otherwise noted, VS = 5 V; TA = 25°C; LO = −7 dBm; I/Q inputs = 1.4 V p-p differential sine waves in quadrature on a 500 mV dc bias;
baseband frequency = 1 MHz; LO source and RF output load impedances are 50 Ω.
8
7
6
5
4
3
2
1
0
–1
SSB OUTPUT POWER (dBm)
–2
–3
–4
50 550 1050 1550 2050
OUTPUT FREQUENCY (MHz)
Figure 3. Single Sideband (SSB) Output Power (P
and Power Supply
8
7
6
5
4
3
2
SSB OUTPUT POWER (dBm)
1
VS = 5.5V
V
= 5.V
S
V
= 4.75V
S
) vs. Output Frequency
OUT
TA = –40°C
T
= +25°C
A
T
= +85°C
A
06118-003
14
13
12
11
10
9
8
7
OUTPUT P1dB (dBm)
6
5
4
50 550 1050 1550 2050
OUTPUT FREQUENCY (MHz)
VS = 5.5V
V
= 5.V
S
V
= 4.75V
S
Figure 6. Output 1 dB Compression Point (OP1dB) vs. Output Frequency
and Power Supply
14
12
10
8
6
OUTPUT P1dB (dBm)
4
2
TA = –40°C
T
= +25°C
A
T
= +85°C
A
06118-006
0
50 550 1050 1550 2050
OUTPUT FREQUENCY (MHz)
Figure 4. Single Sideband (SSB) Output Power (P
) vs. Output Frequency
OUT
6118-004
and Temperature
2.0
1.5
1.0
0.5
0
–0.5
–1.0
OUTPUT PO WER VARIANCE (d B)
–1.5
–2.0
10M 100M 1G
BASEBAND FREQUENCY (Hz )
06118-005
Figure 5. Baseband Frequency Response Normalized to Response for 1 MHz
BB Signal; Carrier Frequency = 500 MHz
0
50 550 1050 1550 2050
OUTPUT FREQUENCY (MHz)
Figure 7. Output 1 dB Compression Point (OP1dB) vs. Output Frequency
and Temperature
20
SSB OUTPUT POWER (dBm)
CARRIER FEEDTHRO UGH (dBm)
SIDEBAND SUPPRESSION (dBc)
SECOND-ORDER DISTORTION (dBc)
–30
THIRD-ORDER DISTORTION (dBc)
–40
–50
–60
SIDEBAND SUPPRESSI ON
–70
DISTORTI ON, CARRIER FEE DTHROUGH,
SECOND-ORDER DIST ORTION, THIRD-ORDE
–80
0.2 0.6 1.0 1.4 1.8 2.2 2.6 3.0 3.4
BASEBAND AMPLITUDE (V p-p)
15
10
5
0
–5
–10
–15
Figure 8. SSB Output Power, Second- and Third-Order Distortion,
Carrier Feedthrough and Sideband Suppression vs. Differential
Baseband Input Level; Output Frequency = 350 MHz
06118-007
OUTPUT AMPL ITUDE (dBm)
06118-008
Rev. 0 | Page 8 of 24
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