PRODUCT SUMMARY SKY77542 Tx–Rx iPAC™ FEM for Dual-Band GSM/GPRS (880–915 MHz), (1710–1785 MHz) Applications Description • Dual-band cellular handsets encompassing - Class 4 GSM900 - DCS1800 - Class 12 GPRS multi-slot operation The SKY77542 is a transmit and receive front-end module (FEM) with Integrated Power Amplifier Control (iPAC™) for dual-band cellular handsets comprising GSM900 and DCS1800 operation. Designed in a low profile, compact form factor, the SKY77542 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 - GSM900 45.0% - DCS1800 38.5% • Low transmit supply current - GSM900 1.26 A - DCS1800 0.93 A • 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 • Tx harmonics below –33 dBm The module consists of a GSM900 PA block and a DCS1800 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 GSM900 band and the other PA block supports the DCS1800 band. 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 PHEMT RF switches and a diplexer. 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 modes are performed using two external control pads. Refer to the functional block diagram in Figure 1 below. The band select pad (BS) selects between GSM and DCS modes of operation. The transmit enable (Tx_EN) pad controls receive or transmit mode of the respective 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 SKY77542 is compatible with logic levels from 1.2 V to VCC for BS 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. • PHEMT RF switches afford high linearity, low insertion loss, and less than 20 μA supply current in receive modes • Small outline: 7 x 6 mm • Low profile: 0.9 mm • Compatible with multiple logic families • Low APC current: 25 μA Figure 1. Functional Block Diagram Skyworks Solutions, Inc. • Phone  376-3000 • Fax  376-3100 • [email protected] • www.skyworksinc.com 201035A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice. • February 17, 2009 1 Ordering Information Model Number Manufacturing Part Number SKY77542 SKY77542 Product Revision Package Operating Temperature MCM 7 x 6 x 0.9 mm –20 °C to +85 °C ©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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