SKY77176 Datasheet, PDF (1/11 Pages) Skyworks Solutions Inc. – AutoSmart Dual-Band Power Amplifier Module for CDMA/PCS(824-849 MHz and 1850-1910 MHz)

ADVANCE DATA SHEET
SKY77176 AutoSmart™ Dual-Band Power Amplifier Module
for CDMA/PCS (824–849 MHz and 1850–1910 MHz)
Applications
• Digital cellular (CDMA)
• 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
• Low IREF
- less than 1 mA
• Good linearity
• High efficiency
• Large dynamic range
• 12-pin package
- 3 mm x 5 mm x 1.0 mm
• Power down control
• InGaP
• IS95/CDMA2000/EVDO
Description
The SKY77176 AutoSmart™ Power Amplifier Module (PAM) is a fully matched, 12-pin surface mount
module developed for Code Division Multiple Access (CDMA) / Personal Communications Services
(PCS) and Wireless Local Loop (WLL) applications.
AutoSmart™ power amplifier technology internally adjusts the RF transistor bias level throughout the
dynamic operating range to minimize battery current consumption and ensure sufficient linear
performance to meet CDMA system requirements. The result is a significant savings in average
battery current without the complications of a system-supplied mode function signal or analog bias
control. AutoSmart™ response time is more than adequate for RF access probe and discontinuous
transmission operation. Mode control is included to permit high-bias operation (disable AutoSmart™)
during high data transmission using CDMA2000 or 1xEVDO.
This small and efficient module packs full coverage of the 824–849 MHz and 1850–1910 MHz
bandwidths into a single compact package. The device meets the stringent IS95 CDMA linearity
requirements up to and exceeding 28 dBm output power. 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 to a
50-ohm load is realized off-chip and within the module package to optimize efficiency and power
performance.
The SKY77176 AutoSmart™ PAM 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 SKY77176 is supplied directly from a three-cell
Ni-Cd, a single-cell Li-Ion, or other suitable battery with an output in the 3.2 to 4.2 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
200409A • Skyworks Proprietary and Confidential information. • Products and product information are subject to change without notice. • November 17, 2007
1