SKY77585 Datasheet, PDF (1/2 Pages) Skyworks Solutions Inc. – Quad-band cellular handsets encompassing

PRODUCT SUMMARY
SKY77585 Tx-Rx Quad-Band Front-End Module for
GSM/GPRS (824-915 MHz) (1710-1910 MHz)
w/ Four Linear TRx Switch Ports
Applications
• Quad-band cellular
handsets encompassing
- Class 4 GSM850/GSM900
- DCS1800/PCS1900
- Class 12 GPRS multi-slot
operation
- EDGE downlink
compatible
Features
• High efficiency
• Low transmit supply current
• 50 Ω matched input/output
• Tx–VCO-to-antenna and
antenna-to-Rx-SAW filter
RF interface
• RF switch affords high
linearity, low insertion loss,
and 0 V DC on Rx ports
• Small, low profile package
- 6 mm x 6 mm x 0.9 mm
- 28-pad configuration
Description
SKY77585 is a transmit and receive Front-End Module (FEM) with integrated power amplifier control
designed in a low profile, compact form factor for quad-band cellular handsets comprising
GSM850/GSM900 and DCS1800/PCS1900 operation. The SKY77585 offers a complete Transmit VCO-
to-Antenna and Antenna-to-Receive SAW filter solution. The FEM also supports Class 12 General
Packet Radio Service (GPRS) multi-slot operation and EDGE downlink.
The module consists of a GSM850/GSM900 PA block and a DCS1800/PCS1900 PA block, impedance-
matching circuitry for 50 Ω input and output impedances, Tx harmonics filtering, high linearity/low
insertion loss RF switch, and a Power Amplifier Control (PAC) block. One PA block supports the
GSM850/GSM900 bands and the other PA block supports the DCS1800/PCS1900 bands. Both PA
blocks share common power supply pads to distribute current. The output of each PA block and the
outputs to the four receive pads are connected to the antenna pad through an RF switch. Four
broadband interchangeable receive ports provide flexibility to support multimode and multiband
configurations. The GaAs die, the CMOS die, the Switch die, and passive components are mounted on
a multi-layer laminate substrate. The assembly is encapsulated with plastic overmold.
Band selection and control of transmit and receive are performed using four external control pads.
Refer to the block diagram in Figure 1 below. The band select pad, BS1, BS2, Mode, and TxEN select
GSM850, GSM900, DCS, and PCS modes of operation.
Transmit enable TxEN controls receive or transmit mode of the RF switch (Tx = logic 1). Proper timing
between transmit enable TxEN and Analog Power Control VRAMP allows for high isolation between the
antenna and Tx–VCO while the VCO is being tuned prior to the transmit burst.
The SKY77585 is compatible with logic levels from 1.2 V to 2.9 V for BS1, BS2, MODE, and TxEN
pads.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
203211A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice. • May 28, 2014
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