ANALOG DEVICES ADL5571 Service Manual
2.5 GHz to 2.7 GHz
V
V
FEATURES
Gain: 29 dB
Operation from 2.5 GHz to 2.7 GHz
EVM ≤ 3% with 16 QAM OFDMA
@ P
= 25 dBm (3.3 V, 2.6 GHz)
OUT
@ P
= 27 dBm (5 V, 2.6 GHz)
OUT
Input matched to 50 Ω
Power supply: 3.2 V to 5 V
Quiescent current: 135 mA
Power-added efficiency (PAE)
21% @ P
Multiple operating modes to reduce battery drain
Standby mode: 9 mA
Sleep mode: <1 μA
APPLICATIONS
WiMAX mobile terminals and CPEs
= 25 dBm (3.3 V, 2.6 GHz)
OUT
WiMAX Power Amplifier
ADL5571
GENERAL DESCRIPTION
The ADL5571 is a high linearity 2.5 GHz to 2.7 GHz power
amplifier designed for WiMAX mobile terminals and CPEs
using TDD operation at a duty cycle of 50% or lower. With a
gain of 29 dB and an output compression point of 31 dBm, it
can operate at an output power level up to 27 dBm while
maintaining an EVM of ≤3% with a supply voltage of 5 V. PAE
is 21% at P
The ADL5571 RF input is matched to provide an input return
loss of better than 10 dB. The open-collector output is externally
matched with a microstrip line and an external shunt capacitor.
The ADL5571 operates over a supply voltage range from 3.2 V
to 5 V with a current of 450 mA burst rms when delivering
25 dBm (3.3 V supply). A standby mode is available that reduces
the quiescent current to 9 mA, which is useful when a TDD
terminal is receiving data.
The ADL5571 is fabricated in a GaAs HBT process and is packaged
in a 4 mm × 4 mm, 16-lead, Pb-free, RoHS-compliant LFCSP
that uses an exposed paddle for excellent thermal impedance. It
operates from −40°C to +85°C.
= 25 dBm with a 3.3 V supply voltage.
OUT
FUNCTIONAL BLOCK DIAGRAM
CC1
ADL5571
RFIN
STBY
VREG
FIRST
IM1 IM2 IM3
STAGE
SECOND
STAGE
BIAS_2BIAS_1 BIAS_3
Figure 1.
CC2
THIRD
STAGE
RFOUT
CFLT
OM
06956-001
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
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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 ©2008 Analog Devices, Inc. All rights reserved.
ADL5571
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
V
= 3.3 V .................................................................................... 3
CC
V
= 5 V ....................................................................................... 4
CC
Absolute Maximum Ratings............................................................ 5
ESD Caution.................................................................................. 5
Pin Configuration and Function Descriptions............................. 6
Typical Performance Characteristics ............................................. 7
REVISION HISTORY
1/08—Revision 0: Initial Version
V
= 3.3 V .....................................................................................7
CC
V
= 5 V ........................................................................................9
CC
Applications Information.............................................................. 11
Basic Connections...................................................................... 11
64 QAM OFDMA Performance............................................... 12
Power-Added Efficiency............................................................ 12
Evaluation Board ............................................................................ 13
Measurement Setup........................................................................ 14
Outline Dimensions ....................................................................... 15
Ordering Guide .......................................................................... 15
Rev. 0 | Page 2 of 16
ADL5571
SPECIFICATIONS
VCC = 3.3 V
T = 25°C, 1024 FFT, 16 QAM OFDMA modulated carrier, 10 MHz channel BW, f = 2.6 GHz, ZL = 50 Ω, STBY = 0 V, VREG = 2.85 V, 31%
duty cycle, ACPR integration BW = 100 kHz (5.05 MHz offset) or 1 MHz (6.5 MHz, 11 MHz, 15 MHz, and 20.5 MHz offset), unless
otherwise noted.
Table 1.
Parameter Conditions Min Typ Max Unit
FREQUENCY RANGE See Tab le 5 for tuning details 2.5 2.7 GHz
LINEAR OUTPUT POWER
GAIN 29 dB
vs. Frequency ±5 MHz ±0.2 dB
vs. Temperature −40°C ≤ TA ≤ +85°C ±2 dB
vs. Supply 3.2 V to 4.2 V ±0.3 dB
OUTPUT P1dB Unmodulated pulse input 31 dBm
EVM P
INPUT RETURN LOSS 20 dB
ACPR P
HARMONIC DISTORTION 45 dBc
SUPPLY CURRENT P
QUIESCENT CURRENT No signal at RF input 135 mA
PAE P
STANDBY MODE CURRENT VREG = 2.85 V, STBY = 2.5 V 9 mA
SLEEP MODE CURRENT VREG = 0 V <1 μA
TURN-ON/-OFF TIME 1 μs
VSWR SURVIVABILITY 10:1
EVM ≤ 3%
= 25 dBm 3 % rms
OUT
= 25 dBm
OUT
±5.05 MHz carrier offset
±6.5 MHz carrier offset
±11 MHz carrier offset
±15 MHz carrier offset
±20.5 MHz carrier offset
= 25 dBm 450 mA
OUT
= 25 dBm 21 %
OUT
25 dBm
−27 dBm
−19 dBm
−24 dBm
−30 dBm
−39 dBm
Rev. 0 | Page 3 of 16
ADL5571
VCC = 5 V
T = 25°C, 1024 FFT, 16 QAM OFDMA modulated carrier, 10 MHz channel BW, f = 2.6 GHz, ZL = 50 Ω, STBY = 0 V, VREG = 2.85 V, 31%
duty cycle, ACPR integration BW = 100 kHz (5.05 MHz offset) or 1 MHz (6.5 MHz, 11 MHz, 15 MHz, and 20.5 MHz offset), unless
otherwise noted.
Table 2.
Parameter Conditions Min Typ Max Unit
FREQUENCY RANGE See Tab le 5 for tuning details 2.5 2.7 GHz
LINEAR OUTPUT POWER EVM ≤ 3% 27 dBm
GAIN 27.5 dB
vs. Frequency ±5 MHz ±0.1 dB
vs. Temperature −40°C ≤ TA ≤ +85°C ±2.5 dB
vs. Supply 4.5 V to 5.5 V ±0.2 dB
OUTPUT P1dB Unmodulated input 32 dBm
EVM P
INPUT RETURN LOSS P
ACPR P
HARMONIC DISTORTION P
SUPPLY CURRENT P
QUIESCENT CURRENT No signal at RF input 135 mA
PAE P
STANDBY MODE CURRENT VREG = 2.85 V, STBY = 2.5 V 9 mA
SLEEP MODE CURRENT VREG = 0 V <1 μA
TURN-ON/-OFF TIME 1 μs
VSWR SURVIVABILITY 10:1
= 27 dBm 3 % rms
OUT
= 27 dBm 16 dB
OUT
= 26.5 dBm
OUT
±5.05 MHz carrier offset
±6.5 MHz carrier offset
±11 MHz carrier offset
±15 MHz carrier offset
±20.5 MHz carrier offset
= 27 dBm 47 dBc
OUT
= 27 dBm 620 mA
OUT
= 27 dBm 16 %
OUT
−28 dBm
−21 dBm
−26 dBm
−29 dBm
−35 dBm
Rev. 0 | Page 4 of 16
ADL5571
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter Rating
Supply Voltage
V
CC
VREG 3 V
STBY 3 V
RFOUT (Modulated—Normal Power Mode)129 dBm
Output Load VSWR 10:1
Operating Temperature Range −40°C to +85°C
Storage Temperature Range −65°C to +150°C
Maximum Solder Reflow Temperature 260°C (30 sec)
1
OFDMA carrier, 16 QAM, 10 MHz channel BW, 1024 FFT.
5.0 V
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.
ESD CAUTION
Rev. 0 | Page 5 of 16
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