CX77140 Datasheet, PDF (1/13 Pages) Skyworks Solutions Inc. – PA Module for CDMA / AMPS (824-849 MHz)

DATA SHEET
CX77140: PA Module for CDMA / AMPS (824–849 MHz)
Applications
• Digital cellular (CDMA)
• Analog cellular (AMPS)
• 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
• Dual mode operation
• 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
The CX77140 Power Amplifier Module (PAM) is a dual-mode, fully matched, 10-pin surface
mount module developed for Code Division Multiple Access (CDMA) / Advanced Mobile
Phone Service (AMPS) cellular handsets and Wireless Local Loop (WLL) applications. This
small and efficient power amplifier module packs full coverage of the 824–849 MHz
bandwidth into a single compact package. The device meets the stringent IS95 CDMA
linearity requirements up to at least 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. 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 CX77140 is supplied directly from a three-cell Ni-Cd, a
single-cell Li-Ion, or other suitable battery with an output in the range of 3.2 to 4.2 volt.
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] 376-7000 • fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
101980A • Skyworks Proprietary and Confidential Information • Products and product Information are subject to change without notice • December 3, 2003
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