PRODUCT SUMMARY SKY77548 Tx-Rx iPAC™ Front-End Module for Dual-Band GSM / GPRS Applications Description • Dual-band cellular handsets encompassing - Class 4 GSM850/900 - DCS1800/PCS1900 - Class 12 GPRS multi-slot operation SKY77548 is a transmit and receive Front-End Module (FEM) with Integrated Power Amplifier Control (iPAC™) for Dual-band cellular handsets comprising GSM850/900 and DCS1800/PCS1900 operation. Designed in a low profile, compact form factor, the SKY77548 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. Features • High efficiency 44% (GSM850/900) 42% (DCS1800/PCS1900) • Low transmit supply current 1.30 A (GSM850/900) 0.86 A (DCS1800/PCS1900) • Internal ICC sense resistor for iPAC • Closed loop iPAC • 50 Ω matched Input/Output • Tx–VCO-to-antenna and antenna-to-Rx-SAW filter RF interface • PHEMT RF switch affords high linearity, low insertion loss, and less than 20 μA supply current in receive modes The module consists of a GSM850/900 PA block and a DCS1800/PCS1900 PA block, impedancematching circuitry for 50 ohm input and output impedances, Tx harmonics filtering, high linearity and a low insertion loss PHEMT RF switch, 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 GSM850/900 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 a PHEMT RF switch. The GaAs die, PHEMT die, Silicon (Si) 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 pads, BS1 and BS2, select GSM850, GSM900, DCS, and PCS modes of operation. Transmit enable Tx_EN controls receive or transmit mode of the RF switch (Tx = logic 1). Proper timing between transmit enable Tx_EN 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 SKY77548 is compatible with logic levels from 1.2 V to VCC for BS1, BS2, and Tx_EN pads, depending on the level applied to the VLOGIC pad. This feature provides additional flexibility for the designer in the selection of FEM interface control logic. • Small outline - 8 mm x 6 mm • Low profile - 1.05 mm • Compatible with multiple logic families • Low APC current: 25 μA Figure 1. SKY77548 Functional Block Diagram Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201127A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice. • August 11, 2009 1 ©2009, Skyworks Solutions, Inc. All Rights Reserved Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. 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