ANALOG DEVICES ADL5570 Service Manual

2.3 GHz to 2.4 GHz

V

V

FEATURES

Fixed gain of 29 dB
Operation from 2.3 GHz to 2.4 GHz
EVM ≤ 3% at P
Input internally matched to 50 Ω
Power supply: 3.2 V to 4.2 V
Quiescent current

130 mA in high power mode

70 mA in low power mode
Power-added efficiency (PAE): 20%
Multiple operating modes to reduce battery drain

Low power mode: 100 mA

Standby mode: 1mA

Sleep mode: <1 μA

APPLICATIONS

WiMAX/WiBro mobile terminals

= 25 dBm with 16 QAM OFDMA

OUT

WiMAX Power Amplifier

FUNCTIONAL BLOCK DIAGRAM

FIRST

IM1 IM2 IM3

RFIN

STBY

VREG

MODE

STAGE

CC1

SECOND

STAGE

BIAS_2BIAS_1 BIAS_3

Figure 1.

THIRD

STAGE

ADL5570

CC2

RFOUT

OM

CFLT

06729-001

GENERAL DESCRIPTION

The ADL5570 is a high linearity 2.3 GHz to 2.4 GHz power
amplifier designed for WiMAX terminals using TDD operation
at a duty cycle of 31%. With a gain of 29 dB and an output
compression point of 31 dBm at 2.35 GHz, it can operate at
an output power level up to 26 dBm while maintaining an EVM
of ≤3% (OFDM 16 or 64 QAM) with a supply voltage of 3.5 V.
PAE is 20% @ P

The ADL5570 RF input is matched on-chip and provides an
input return loss of less than −10 dB. The open-collector output is
externally matched with strip-line and external shunt capacitance.

= 25 dBm.

OUT

The ADL5570 operates over a supply voltage range from 3.2 V
to 4.2 V with a supply current of 440 mA burst rms when
delivering 25 dBm (3.5 V supply). A low power mode is also
available for operation at power levels of ≤10 dBm with
optimized operating and quiescent currents of 100 mA and
70 mA, respectively. A standby mode is available that reduces
the quiescent current to 1 mA, which is useful when a TDD
terminal is receiving data.

The ADL5570 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.

Rev. 0

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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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Tel: [phone] www.analog.com
Fax: [phone] ©2007 Analog Devices, Inc. All rights reserved.

ADL5570

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

Functional Block Diagram .............................................................. 1

General Description......................................................................... 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

V

= 3.5 V .................................................................................... 3

CC

Absolute Maximum Ratings............................................................ 4

ESD Caution.................................................................................. 4

Pin Configuration and Function Descriptions............................. 5

Typical Performance Characteristics ............................................. 6

REVISION HISTORY

5/07—Rev. 0: Initial Version

Applications........................................................................................8

Basic Connections.........................................................................8

64 QAM OFDMA Performance..................................................9

Power-Added Efficiency...............................................................9

Evaluation Board ............................................................................ 10

Measurement Setup Using the ADL5570

Evaluation Board ........................................................................ 11

Outline Dimensions ....................................................................... 12

Ordering Guide .......................................................................... 12

Rev. 0 | Page 2 of 12

ADL5570

SPECIFICATIONS

VCC = 3.5 V

TA = 25°C, 1024 FFT, 16 QAM OFDMA modulated carrier, 10 MHz channel BW, 16 QAM, ZL = 50 Ω, MODE = 0 V, STBY = 0 V,
VREG = 2.85 V, 31% duty cycle, unless otherwise noted.

Table 1.

Parameter Conditions Min Typ Max Unit

FREQUENCY RANGE 2.3 2.4 GHz
LINEAR OUTPUT POWER

MODE = 0 V, 16 QAM, EVM ≤ 3%
MODE = 2.5 V, 16 QAM, EVM ≤ 3%

GAIN 29 dB

vs. Frequency ±5 MHz ±0.1 dB
vs. Temperature −40°C ≤ TA ≤ +85°C ±1.5 dB

vs. Supply 3.2 V to 4.2 V ±0.5 dB
OP1dB Unmodulated input 31 dBm
EVM P

= 25 dBm 3 % rms

OUT

INPUT RETURN LOSS 10 dB
WiBro SPECTRAL MASK @ P

(CARRIER OFFSETS SCALED TO 10 MHz BW SIGNAL)

FCC SPECTRAL MASK @ P

= 25 dBm

OUT

= 25 dBm

OUT

1

±5.45 MHz carrier offset

±10.9 MHz carrier offset
±15.12 MHz carrier offset
±20.26 MHz carrier offset

±5 MHz carrier offset
±6 MHz carrier offset
±10.5 MHz carrier offset
±20 MHz carrier offset

HARMONIC DISTORTION 43 dBc
POWER SUPPLY INTERFACE VCC = 3.5 V
SUPPLY CURRENT P
P
PAE P

= 25 dBm, MODE = 0 V 440 mA

OUT

= 10 dBm, MODE = 2.5 V 100 mA

OUT

= 25 dBm, MODE = 0 V 20 %

OUT

STANDBY MODE VREG = 2.85 V, STBY = 2.5 V 1 mA
SLEEP MODE VREG = 0 V 10 μA
TURN ON/OFF TIME 1 μs
VSWR SURVIVABILITY 10:1

1

OFDMA carrier, 16 QAM, 10 MHz channel BW, 1024 FFT.

25 dBm
10 dBm

36 dBr

42 dBr
48 dBr
52 dBr

36 dBr
38 dBr
42 dBr
52 dBr

Rev. 0 | Page 3 of 12

ADL5570

ABSOLUTE MAXIMUM RATINGS

Table 2.

Parameter Rating

Supply Voltage

V

CC

VREG 3 V
STBY 3 V

MODE 3 V
RFOUT (Modulated—High Power Mode)
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

1

29 dBm

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 4 of 12