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PDF ADL5571 Data sheet ( Hoja de datos )
| Número de pieza | ADL5571 | |
| Descripción | 2.5 GHz to 2.7 GHz WiMAX Power Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
Gain: 29 dB
Operation from 2.5 GHz to 2.7 GHz
EVM ≤ 3% with 16 QAM OFDMA
@ POUT = 25 dBm (3.3 V, 2.6 GHz)
@ POUT = 27 dBm (5 V, 2.6 GHz)
Input matched to 50 Ω
www.DataSheePt4oUw.ceormsupply: 3.2 V to 5 V
Quiescent current: 135 mA
Power-added efficiency (PAE)
21% @ POUT = 25 dBm (3.3 V, 2.6 GHz)
Multiple operating modes to reduce battery drain
Standby mode: 9 mA
Sleep mode: <1 μA
APPLICATIONS
WiMAX mobile terminals and CPEs
2.5 GHz to 2.7 GHz
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 POUT = 25 dBm with a 3.3 V supply voltage.
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.
FUNCTIONAL BLOCK DIAGRAM
VCC1
VCC2
ADL5571
RFIN
IM1
FIRST
STAGE
IM2
SECOND
STAGE
IM3
THIRD
STAGE
RFOUT
OM
STBY
VREG
BIAS_1
BIAS_2
Figure 1.
BIAS_3
CFLT
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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.
1 page  
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter
Supply Voltage
VCC
VREG
STBY
RFOUT (Modulated—Normal Power Mode)1
Output Load VSWR
Operating Temperature Range
www.DataSheeSt4toUr.acgoemTemperature Range
Maximum Solder Reflow Temperature
Rating
5.0 V
3V
3V
29 dBm
10:1
−40°C to +85°C
−65°C to +150°C
260°C (30 sec)
1 OFDMA carrier, 16 QAM, 10 MHz channel BW, 1024 FFT.
ADL5571
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
5 Page 
APPLICATIONS INFORMATION
BASIC CONNECTIONS
Figure 19 shows the basic connections for the ADL5571.
STBY
C8
VPOS
L1 C6
1nH 3.3pF
C11
1µF
VPOS
0.01µF
VPOS1
C7
0.01µF
L2
11nH
C5
OPEN
C12
1µF
www.DataSheeRtF4INU.coLm3
2.7nH
VREG
C9
0.01µF
5 VCC1
NC 16
6 RFIN
7 GND
RFOUT 15
ADL5571
RFOUT 14
8 VREG
NC 13
C3
2.7pF
C4 RFOUT
39pF
C2
2.2pF
C10
0.01µF
VPOS1
W1
VPOS
NC = NO CONNECT
Figure 19. Basic Connections
Power Supply
The voltage supply on the ADL5571, which ranges from
3.2 V to 4.2 V, should be connected to the VCCx pins. VCC1 is
decoupled with Capacitor C7, whereas VCC2 uses a tank circuit
to prevent RF signals from propagating on the dc lines.
RF Input Interface
The RFIN pin is the port for the RF input signal to the power
amplifier. The L3 inductor, 2.7 nH, matches the input
impedance to 50 Ω.
2.7nH
L3
6 RFIN
Figure 20. RF Input with Matching Component
ADL5571
RF Output Interface
The parallel RF output ports have a shunt capacitor, C3 (2.7 pF),
and the line inductance of the microstrip line for optimized
output power and linearity. The characteristics of the ADL5571
are described for 50 Ω impedance after the output matching
capacitor (load after C3). C4 provides dc blocking on the
RF output.
VPOS1
L2
11nH
C5 C12
OPEN 1µF
RFOUT 15
RFOUT 14
C4
39pF
C3
2.7pF
RFOUT
Figure 21. RF Output
Transmit/Standby Enable
During normal transmit mode, the STBY pin is biased low
(0 V). However, during receive mode, the pin can be biased
high (2.5 V) to shift the device into standby mode, which
reduces current consumption to 9 mA.
VREG Enable
During normal transmit, the VREG pin is biased to 2.85 V and
draws 9 mA of current. When the VREG pin is low (0 V), the
device suspends itself into sleep mode (irrespective of supply
biasing). In this mode, the device draws less than 1 μA of
current.
Rev. 0 | Page 11 of 16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ADL5571.PDF ] | |
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