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參數(shù)資料
| 型號(hào)： | CX77144 |
| 英文描述： | CX77144 Product Summary|PA Modules for CDMA Handsets |
| 中文描述： | CX77144產(chǎn)品概要|功率放大器模塊的CDMA手機(jī) |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 246K |
| 代理商： | CX77144 |
Data Sheet
2001, 2002 Conexant Systems, Inc., All Rights Reserved.
101384A
May 14, 2002
CX77129
System Smart PA Module for CDMA / AMPS (824–849 MHz)
The CX77129 Power Amplifier Module is a dual-mode Code Division Multiple
Access (CDMA) / Advanced Mobile Phone Service (AMPS) module designed for
mobile units operating in the 824–849 MHz cellular bandwidth. This device
meets stringent IS95 CDMA linearity requirements to and beyond 28 dBm output
power and can be driven to power output levels beyond 31 dBm for high
efficiency FM mode operation. The CX77129 System Smart
TM
design presents a
unique feature that enables exceptionally low average battery current
consumption with two control pins that accept digital signals provided by the
system’s baseband ASIC. This digital control logic defines an RF power range of
operation for the PA. The decoding logic within the PA uses this information to
optimize efficiency within this power range while meeting the specification for
Adjacent Channel Power Ratio (ACPR).
The two control pins (referred to as V
CONT1
and V
CONT2
) allow the PA to be
switched into one of four states.
State/Power-range 3—high power mode, linear up to P
OUT
= 28 dBm, total
PA current is typically 560 mA (V
CONT1
= High, V
CONT2
= High)
State/Power-range 2—medium power mode, linear up to P
OUT
= 13 dBm,
total PA current is typically 130 mA (V
CONT1
= Low, V
CONT2
= High)
State/Power-range 1—low power mode, linear up to P
OUT
= –5 dBm, total
PA current is typically 46 mA (V
CONT1
= Low, V
CONT2
= Low)
State/Power-range 0—power-down mode, leakage current less than 5
μ
A
(V
CONT1
= Low, V
CONT2
= Low, V
REF
= 0.0 V)
The current in States 1 and 2 is much lower than that achieved in a conventional
Power Amplifier.
Functional Block Diagram
MMIC
MODULE
RFIN
(2)
RFOUT
(6)
V
(5, 8)
GND
(7)
GND2
(9)
V
CC
(1)
V
(4)
Bias Circuits and Decoding Logic
Input
Match
DA
Inter
Stage
Match
PA
Output
Match
V
REF
(3)
Distinguishing Features
System Smart
TM
design
Three switchable power states
Dual digital input for setting
power states
Power down control
Higher efficiency over large
dynamic range
8-pin LCC package
(6 x 6 x 1.5 mm)
Applications
Digital cellular (CDMA)
Analog cellular (AMPS)
Wireless Local Loop (WLL)
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