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PDF ADL5570 Data sheet ( Hoja de datos )
| Número de pieza | ADL5570 | |
| Descripción | 2.3 GHz to 2.4 GHz WiMAX Power Amplifier | |
| Fabricantes | Analog Devices | |
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Preliminary Technical Data
FEATURES
Fixed gain of 29 dB
Operation from 2.3 GHz to 2.4 GHz
EVM ≤3% with 16 QAM OFDMA
@ POUT = 25 dBm [3.5V] and
@ POUT = 27.5 dBm [5V]
Input internally matched to 50 Ω
Power supply: 3.2 V to 5.5 V
Quiescent current
130 mA in high power mode
70 mA in low power mode
PAE: >20%
Multiple operating modes to reduce battery drain
Low power mode: 100 mA (Operating)
Standby mode: 10 mA
Sleep mode: < 1 μA
APPLICATIONS
WiMAX/WiBro Mobile Terminals and CPEs
Good performance from 2.5Ghz to 2.7Ghz - See Page 7
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GENERAL DESCRIPTION
The ADL5570 is a high linearity 2.3 GHz to 2.4 GHz power
amplifier designed for WiMAX 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 26 dBm while maintaining an EVM
of ≤3% with a supply voltage of 3.5V. PAE is greater than 20% at
POUT = 25 dBm with a 3.5V supply voltage.
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.
2.3 GHz to 2.4 GHz
WiMAX Power Amplifier
ADL5570
FUNCTIONAL BLOCK DIAGRAM
VCC1
VCC2
RFIN IM1 1st stage IM2 2nd stage IM3 3rd stage
OM
RFOUT
STBY
VREG
MODE
Bias_1
Bias_2
Bias_3
CFLT
Figure 1.AD5570 Block Diagram
The ADL5570 operates over a supply voltage range from 3.2 V
to 5.5 V with a supply current of 400mA Burst RMS when
delivering 25 dBm (3.5 V supply). A low power mode is also
available for operation at power levels ≤10 dBm with optimized
operating and quiescent currents of 100 and 70 mA,
respectively. A Standby mode is available which reduces the
quiescent current to 10 mA: useful when a TDD terminal is
receiving data.
The ADL5570 is fabricated in a GaAs HBT process and is
packaged in a 4mm x 4mm 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. PrG
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
©2007 Analog Devices, Inc. All rights reserved.
1 page  
Preliminary Technical Data
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADL5570
VCC1 5
RFIN 6
GND 7
VREG 8
PIN 1
INDICATOR
ADL5570
TOP VIEW
(Not to Scale)
16 NC
15 RFOUT
14 RFOUT
13 NC
Figure 2. ADL5570 Pin Configuration
Table 3. Pin Function Descriptions
Pin No.
Mnemonic
Description
5
VCC1
Connect to Power Supply.
6
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8
RFIN
VREG
Matched RF Input.
When VREG is low, the device goes into sleep mode, reducing supply current to 1 uA. When VREG is
high (2.85 V), the device operates in its normal transmit mode. When high, VREG draws a bias current of
approximately 10 mA.
9 CFLT A Ground Referenced Capacitor. It should be connected to this node to reduce bias line noise (see
figure 8).
10
MODE
Switches Between High Power and Low Power Modes. When MODE is low (0 V), the device operates in
high power mode. When MODE is high (2.5 V), the device operates in low power mode.
14, 15
RFOUT
Unmatched RF Output. These parallel outputs can be matched to 50 Ω using strip-line and shunt
capacitance. The power supply voltage should be connected to these pins through a choke inductor.
2
VCC2
This power supply pin should be connected to the supply via a choke circuit (see Figure 8).
4
STBY
When STBY is low (0 V), the device operates in transmit mode. When the radio is receiving data, STBY
can be taken high (2.5 V), reducing supply current to 10 mA.
1, 11 to 13, 16 N/C
No Connect. Do not connect these pins.
7 GND Connected to Ground.
Exposed
Paddle
The exposed paddle should be soldered down to a low impedance ground plane (use multiple vias (at
least 9) to stitch together the ground planes) for optimum electrical and thermal performance.
Table 4. Operating Modes1
Mnemonic
Normal Operation
VREG
High
MODE
Low
STBY
Low
Low Power Mode, POUT ≤ 10dBm
High
High
Low
Standby Mode
High
X
High
Sleep Mode
Low
X
X
1 X = don’t care.
Rev. PrG | Page 5 of 10
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet ADL5570.PDF ] | |
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