SKY77582 Datasheet, PDF (1/2 Pages) Skyworks Solutions Inc. – Low transmit supply current

PRODUCT SUMMARY
SKY77582 Tx Quad-Band / Rx Dual-Band Front-End Module
for GSM / GPRS (824–915 MHz) (1710–1910 MHz)
Applications
• Dual-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
SKY77582 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 SKY77582 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 ohm 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 two receive pads are connected to the antenna pad
through an RF switch. The GaAs die, 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, BS, selects 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 SKY77582 is compatible with logic levels from 1.2 V to 2.9 V for BS, TxEN, and VSW_EN pads.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
202780A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice. • March 21, 2013
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