SKY77425 Datasheet, PDF (1/9 Pages) Skyworks Solutions Inc. – Front-End Module for CDMA (Tx 824-849 MHz), (Rx 869-894 MHz)

ADVANCE DATA SHEET
SKY77425 Front-End Module for CDMA
(Tx 824-849 MHz), (Rx 869-894 MHz)
Applications
• Digital cellular (CMDA)
handsets
• Wireless Local Loop (WLL)
Features
• Low quiescent current
- 10 mA Low Mode
• Low current consumption
- 500 mA @ 26.0 dBm
• Integrated Coupler
• 20-pad package
• Small profile
- 4 mm x 7 mm x 1.1 mm
• Low voltage
- 3.2 V to 4.2 V
• Digital enable pad
• Highly integrated, user
friendly solution
• InGaP HBT
• Integrated interstage filter
and duplexer
• Requires few external
components
Description
The SKY77425 Front-End Module (FEM) is a fully matched, 20-pad surface mount module developed
for CDMA applications. Small and efficient, this CDMA FEM integrates the interstage filter, the input
matching, the power amplifier, the output matching, the directional coupler, and the duplexer into a
single 4 mm x 7 mm x 1.1 mm package.
The SKY77425 meets the stringent spectral requirements of IS95/I98 standards up to 26.0 dBm
output power. The FEM includes an InGaP HBT PA incorporating three selectable bias levels to
enhance the performance of the FEM at different power levels.
Integration of the RF front-end greatly simplifies the design of the handset radio as all critical
matching between the interstage filter, PA, directional coupler, and duplexer is optimized within the
module. By optimizing the efficiency of the InGaP HBT PA MMIC and reducing the RF loss between
the integrated components, this FEM achieves current as low as 500 mA at maximum output power
(26.0 dBm) that significantly improves the talk time of the CDMA handset. This small package uses
Skyworks’ low cost, multi-laminate substrate technology and is approximately half the size of
individually packaged component solutions. The SKY77425 front-end module can save handset
designers significant board space and design-cycle time.
Figure 1. Functional Block Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
200870A • Skyworks Proprietary and Confidential Information. • Products and product information are subject to change without notice. • April 3, 2008
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