CX77112 Datasheet, PDF (1/14 Pages) Skyworks Solutions Inc. – PA Module for CDMA PCS (1850-1910 MHz)

DATA SHEET
CX77112 PA Module for CDMA PCS (1850–1910 MHz)
Applications
• Personal Communications
Services (PCS)
• Wireless Local Loop (WLL)
Features
• Low voltage positive bias
supply
- 3.2 V to 4.2 V
• Low VREF
- 2.85 V, nominal
• Good linearity
• High efficiency
• Large dynamic range
• 10-pin package
- 4 mm x 4 mm x 1.5 mm
• Power down control
• Low power-state control
• InGaP
• IS95/CDMA2000
• Full U.S. PCS coverage
Description
The CX77112 Power Amplifier Module (PAM) is a fully matched 10-pin surface mount module
developed for Personal Communications Service (PCS) and Wireless Local Loop (WLL) applications.
This small and efficient Power Amplifier packs full 1850–1910 MHz bandwidth coverage into a single
compact package. The CX77112 meets the stringent spectral linearity requirements of Code Division
Multiple Access (CDMA) PCS transmission, with high power added efficiency for power output of up to
29 dBm. A low current (VCONT) pin is provided to improve 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. Output match is realized off-chip 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 CX77112 is
supplied directly from a three-cell Ni-Cd, a single-cell Li-Ion, or other suitable battery with an output
in the 3 to 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.
Figure 1. Functional Block Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
101904F • Skyworks Proprietary and Confidential Information. • Products and product information are subject to change without notice. • June 1, 2005
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