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  skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 200530p1 ? skyworks proprietary and confidential information ? products and product informat ion are subject to change with out notice. ? april 7, 2006 1 preliminary product summary SKY77517 tx-rx ipac? fem for dual-band gsm/gprs applications ? dual-band cellular handsets encompassing - class 4 gsm850 - pcs1900 - class 12 gprs multi-slot operation features ? high efficiency - gsm850 46% - pcs 41% ? low transmit supply current - gsm850 1.3 a - pcs1900 0.9 a ? internal icc sense resistor for ipac ? closed loop ipac ? 50 ? matched input/output ? txCvco-to-antenna and antenna- to-rx-saw filter rf interface ? tx harmonics below C33 dbm ? phemt rf switches afford high linearity, low insertion loss, and less than 20 a supply current in receive modes ? small outline: 6 mm x 8 mm ? low profile: 1.2 mm ? compatible with multiple logic families ? low apc current: 25 a ? gold plated, lead free contacts skyworks offers lead (pb)-free "environmentally friendly" packaging that is rohs compliant (european parliament for the restriction of hazardous substances). description the SKY77517 is a transmit and receive front-end module (fem) with integrated power amplifier control (ipac?) for dual-band ce llular handsets comprising gsm850 and pcs1900 operation. designed in a low profile, compact form factor, the SKY77517 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. the module consists of a gsm850 pa block and a pcs1900 pa block, impedance-matching circuitry for 50 ? 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 gsm850 band and the other pa block supports the pcs1900 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 co nnected 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 pcs 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 SKY77517 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. gsm_in vbatt vramp tx_en bs pcs_in bicmos integrated power amplifier controller antenna switch decoder match match hbt gsm_out pcs_out match/ filter match/ filter 4 2 gsm_rx pcs_rx gnd diplexer SKY77517 pa pa 200530_001 2 vlogic figure 1. functional block diagram
? 2006, skyworks solutions, inc. all rights reserved information in this document is provided in connection with sk yworks solutions, inc. ("skyworks") products. these materials are provided by skyworks as a service to its customers and may be used for informational purposes only. skyworks assumes no responsi bility for errors or omissions in these materials. skyworks m ay make changes to its products, specifications and product descriptions at any time, without notice. skyworks makes no commitment to update the information and shall have no responsibili ty whatsoever for conflicts, incomp atibilities, or other difficulties arising from future changes to its products and pro duct descriptions. no license, express or implied, by estoppel or otherwise, to an y intellectual property rights is granted by this document. exce pt as may be provided in skyworks terms and conditions of sale for such products, skyworks assumes no liability whatsoever. these materials are provided "as is" without warranty of any ki nd, either express or implied, re lating to sale and/or use of sk yworks? products including warranties relating to fitness for a parti cular purpose, merchantability, performance, quality or non-infringement of any paten t, copyright or other intellectual property right. skyworks further does not warrant the accuracy or completeness of the information, text, graphics or other item s contained within these materials. skyworks shall not be liable for any special, indirect, incidental, or consequential damages, including without limi tation, lost revenues or lost profits that may result from th e use of these materials. skyworks? products are not intended for use in medical, lifesav ing or life-sustaining applications. skyworks customers using o r selling skyworks? products for use in such applications do so at their own risk and agree to fully indemnify skyworks for any damages resulting from such improper use or sale. the following are trademarks of skyworks so lutions, inc.: skyworks?, the skyworks sy mbol, and breakthrough simplicity?. produ ct names or services listed in this publication are for identification purposes only, and may be trad emarks of third parties. third-party bran ds and names are the property of their re spective owners. additional information, posted at www.skywor ksinc.com, is incorporated by reference.


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