SKY77552

www.DataSheet4U.com PRODUCT SUMMARY SKY77552 Quad-Band Tx / Dual-Band Rx iPAC™ FEM for GSM / GPRS (824–915 MHz and 1710–1910 MHz) Applications U.S. or Euro dual-band cellular handsets encompassing - Class 4 GSM850/900 - DCS1800/PCS1900 - Class 12 GPRS multi-slot operation Description The SKY77552 is a quad-band transmit and dual-band receive front-end module (FEM) with Integrated Power Amplifier Control (iPAC™) for cellular handsets comprising GSM and DCS/PCS operation. The FEM has quad-band capability in applications of U.S. or Euro dual-band platforms. Designed in a low profile, compact form factor, the SKY77552 offers a complete Transmit VCO-toAntenna and Antenna-to-Receive SAW filter solution. The FEM also supports Class 12 General Packet Radio Service (GPRS) multi-slot operation. The module consists of a GSM PA block and a DCS/PCS PA block, impedance-matching circuitry for 50 Ω input and output impedances, Tx harmonics filtering, high linearity and low insertion loss PHEMT RF switches, diplexer and a Power Amplifier Control (PAC) block with internal current sense resistor. A custom BiCMOS integrated circuit provides the internal PAC function and decoder circuitry to control the RF switches. The two Heterojunction Bipolar Transistor (HBT) PA blocks are fabricated onto a single Gallium Arsenide (GaAs) die. One PA block supports the GSM band and the other PA block supports the DCS/PCS band. Both PA blocks share common power supply pads to distribute current. The output...