Preliminary Information 101879P1
© 2001, 2002 Conexant Systems, Inc., All Rights Reserved. March 8, 2002
PRODUCT SUMMARY
CX77130
System Smart™ PA Module for CDMA PCS (1720–1780 MHz)
The CX77130 Power Amplifier Module (PAM) for Code Division Multiple Access
(CDMA) Personal Communications Service (PCS) incorporates a unique design
feature that enables exceptionally low average battery current consumption. The
CX77130 System SmartTM design incorporates 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 VCONT1 and VCONT2) allow the PA to be switched into
one of four states.
• State/Power-range 3—high power mode, linear up to POUT = 28 dBm, total PA
current less than 550 mA (VCONT1 = High, VCONT2 = High)
• State/Power-range 2—medium power mode, linear up to POUT = 13 dBm, total
PA current less than 130 mA (VCONT1 = Low, VCONT2 = High)
• State/ Power-range 1—low power mode, linear up t o POUT = –5 dBm, total PA
current less than 35 mA (VCONT1 = Low, VCONT2 = Low)
• State/Power-range 0—power-down mode, leakage current less than 20 µA
(VCONT1 = Low, VCONT2 = Low, VREF = 0.0 V)
The total PA currents in States 1 and 2 are much lower than those achieved in a
conventional Power Amplifier.
Functional Block Diagram
MMIC
MODULE
RFIN
(2) RFOUT
(6)
V
CONT2
(7)
GND (9)
GND2
V
CC
V
CONT1
Bias Circuits and Decoding Logic
Input
Match DA Inter
Stage
Match PA Output
Match
(4)
(8) (1, 5)
V
REF
(3)
Distinguishing Features
•System SmartTM design
•Dual digital input for setting
power states
•Three switchable power states
•Power down control
•Higher efficiency over large
dynam ic r ange
•8-pin LC C package
(6 x 6 x 1.5 mm)
•Full Korean PCS coverage
Applications
•Personal Communications
Services (PCS)
•Wirel ess Local Loop (WLL)
Preliminary
© 2001, 2002 Conexant Systems, Inc.
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Preliminary
