PRODUCT SUMMARY SKY77528 Tx Front-End Module for Quad-Band GSM / EDGE Applications Description • Quad-band, cellular handsets: - Class 4 GSM850/ GSM900 - Class 1 DCS1800/ PCS1900 - Class E2 GSM850/ EGSM900 - Class E2 DCS1800/ PCS1900 - Class 12 EGPRS multi-slot operation The SKY77528 is a transmit Front-End Module (FEM) designed for quad-band Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS), and Enhanced Data Rate for GSM Evolution (EDGE) handsets and modules. Features • High efficiency: - GSM850, 45% (peak) - EGSM900, 45% (peak) - DCS1800, 40% (peak) - PCS1900, 40% (peak) • Low-loss PHEMT RF antenna switch The SKY77528 consists of a GSM850/EGSM900 PA block and a DCS1800/PCS1900 PA block, impedance-matching circuitry for 50 Ω inputs and outputs, a multi-function PA control block, lowpass harmonic rejection filter, and a transmit/receive antenna switch. Two Heterojunction Bipolar Transistor (HBT) PA blocks are fabricated onto an Indium Gallium Phosphide (InGaP) die; one block supports the GSM850 and EGSM900 bands, the other supports the DCS1800 and PCS1900 bands. The InGaP die, the Silicon (Si) die, the PHEMT die, and the passive components are mounted on a multi-layer laminate substrate. The entire assembly is encapsulated with plastic overmold. Pad signals BS1 and BS2 select the GSM/EGSM or DCS/PCS frequency bands. The TX_EN pad signal selects transmit or receive mode of the respective RF switch. MODE pad circuitry selects GMSK modulation or EDGE modulation. The VRAMP pad controls the output power for GMSK modulation and provides bias optimization for EDGE modulation depending on the state of the MODE pad. An integrated Multi-Function Control (MFC) circuit provides closed loop power control in GMSK mode, reducing sensitivity to antenna load, input drive, temperature, power supply, and process variation. In EDGE mode, the MFC configures the PA for fixed gain and provides the ability to optimize the PA bias operation at different power levels. The VDET pad is used to detect saturation conditions in GMSK mode (which automatically reduces the VRAMP output) and for power control in EDGE mode. The functional block diagram for the 34-pad Multi-Chip Module (MCM) package is shown in Figure 1. • Detector output: linear dB/V • Closed loop GMSK mode power control • Low VRAMP current • Low VBATT detection • Integrated temperature sensor • Small Package - 8 mm x 6 mm • Low Profile - 1.1 mm Max. Figure 1. SKY77528 Functional Block Diagram Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201050A • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • March 11, 2009 1 Ordering Information Model Number Manufacturing Part Number SKY77528 SKY77528 Product Revision Package Operating Temperature MCM 8 x 6 x 1.1 mm Max. –25 °C to 85 °C Copyright © 2009 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. 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