CX77105 Datasheet, PDF (1/17 Pages) Skyworks Solutions Inc. – Power Amplifier Module for CDMA/AMPS (824-849 MHz)

CX77105
Power Amplifier Module for CDMA/AMPS (824–849 MHz)
The CX77105, a dual-mode, Code Division Multiple Access (CDMA) / Advanced
Mobile Phone Service (AMPS) Power Amplifier Module (PAM), is a fully matched,
10-pin surface mount module developed for cellular handsets and wireless local loop
applications. This small and efficient power amplifier module packs a full 824–849
MHz bandwidth coverage into a single compact package. The device meets the
stringent IS95 CDMA linearity requirements to and exceeding 28 dBm output power,
and can be driven to levels beyond 31 dBm for high efficiency in FM mode operation.
A low current digital pin (VCONT) provides improved efficiency for the low RF power
range of operation.
The single Gallium Arsenide (GaAs) Microwave Monolithic Integrated Circuit (MMIC)
contains all active circuitry in the module. The MMIC contains on-board bias circuitry,
as well as input and interstage matching circuits. The output match is realized off-chip
and within the module package to optimize efficiency and power performance into a
50 Ω load. This device is manufactured with Skyworks’ GaAs Heterojunction Bipolar
Transistor (HBT) process that provides for all positive voltage DC supply operation
while maintaining high efficiency and good linearity. Primary bias to the CX77105 is
supplied directly from a three-cell nickel cadmium, a single-cell lithium ion, or other
suitable battery with an output in the 3–4 volt range. Power down is accomplished by
setting the voltage on the low current reference pin to zero volts. No external supply
side switch is needed as typical “off” leakage is a few microamperes with full primary
voltage supplied from the battery.
Distinguishing Features
• Low voltage positive bias supply
(3.2 V to 4.2 V, typical)
• Good linearity
• High efficiency
• Dual mode operation
• Large dynamic range
• 10-pin package (4 x 4 x 1.5 mm)
• Power down control
• Low power-state control
• InGaP
• IS 95/CDMA2000
Applications
• Digital cellular (CDMA)
• Analog cellular (AMPS)
• Wireless local loop (WLL)
Functional Block Diagram
VREF
(1)
VCC1
(5)
VCONT
(2)
VCC2
(6)
RF IN (4)
Driver
Stage Bias
Power
Stage Bias
Input
Match
DA
Inter
Stage
PA
Match
MMIC
Output
Match
(8) RF OUT
(3, 7, 9, 10)
GND
MODULE
(3, 7, 9, 10)
GND
Data Sheet
© 2001, 2002 Skyworks Solutions, Inc., All Rights Reserved.
101787A
December 10, 2002