skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201484b ? skyworks proprietary and confiden tial information ? products and produc t information are subject to change withou t notice. ? april 20, 2011 1 product summary SKY77551 tx-rx fem for quad-band gsm / gprs / edge C triple-band wcdma antenna switch support applications ? quad-band cellular handsets encompassing - class 4 gsm850/900 - class 1 dcs1800/pcs1900 - class 12 gprs multi-slot operation - triple band wcdma antenna switch support - linear edge operation features ? small, low profile package - 6 mm x 6 mm x 0.9 mm - 28-pad configuration ? low input power range - C1 to 6 dbm ? high efficiency - 41.0% gsm850 - 42.0% gsm900 - 38.5% dcs1800 - 38.5% pcs1900 ? tx-vco-to-antenna and antenna- to-rx-saw filter rf interface ? tx harmonics below C38 dbm ? current limiting for over-voltage protection and extended battery life ? input/output matched internally to 50 ? high impedance control inputs: 20 a, maximum ? input control circuitry built-in for improved trp variation description SKY77551 is a transmit and receive front end module (fem) designed in a very low profile (0.9 mm) and compact form factor for quad-band cellular handsets comprising gsm850/900, dcs1800, and pcs1900 operation 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 and linear edge operation. wcdma switch-through support is provided by three dedicated high-linearity ports. the module consists of a gsm850/900 pa and dcs1800/pcs1900 pa block, impedance- matching circuitry for 50 input and output impedances, tx harmonic filtering, a high linearity/low insertion loss switch, and a cmos power amplifier control (pac) block. a custom silicon integrated circuit contains decoder circuitry to control the rf switch while providing a low current, external control interface. fabricated in ingap/gaas, the heterojunction bipolar transistor (hbt) pa blocks support the gsm850/900 bands and dcs1800/pcs1900 bands. both pa blocks share common power supply pads to distribute current. the output of the pa block and the outputs to the seven receive pads connect to the antenna pad through a high-linearity antenna switch. the wcdma and rx ports feature a 0 volts dc offset level which eliminates the need for external blocking capacitors. the ingap/gaas die, switch die, silicon (si) controller die, and passive components are mounted on a multi-layer laminate substrate and the entire assembly is encapsulated with plastic overmold. rf input and output ports of the SKY77551 are internally matched to a 50 load to reduce the number of external components on the phone bo ard. extremely low leakage current of the fem maximizes handset standby time. control of transmit and receive rf signal flows, and band selection are performed by four external control pads (see figure 1 on overleaf). mode of operation, tx vs. rx, and band (gsm850, gsm900, dcs1800, and pcs1900) are controlled with the four logic inputs: mode, txen, bs1, a nd bs2. proper timing of the txen input and the vramp input ensures high isolation between the antenna and tx-vco while the vco is being tuned prior to the transmit burst. all logic control inputs returned to a standby state (0 v) ensure etsi compliance to the harmonics specification. the integrated power amplifier control (pac) function provides envelope amplitude control by reducing sensitivity to input drive, temperature, power supply, and process variation. output power variation into mismatch is minimized with skyworks true power control circuit.
product summary SKY77551 tx-rx fem for quad-band gsm / gprs / edge C triple-band wcdma antenna switch support skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 2 april 20, 2011 ? skyworks proprietary and confidential information ? products a nd product information are subject to chang e without notice. ? 201484b figure 1. SKY77551 functional block diagram ordering information order number manufacturing part number evaluation board part number SKY77551 SKY77551- ? 2011, skyworks solutions, inc. all rights reserved. information in this document is provided in connection with skyw orks solutions, inc. (skyworks) products or services. these m aterials, including the information co ntained herein, are provided by skyworks as a service to its customers and may be used for info rmational purposes only by the customer. skyworks assumes no res ponsibility for errors or omissions in these materials or the information contained herein. skyworks may change its documentat ion, products, services, specific ations or product descriptions at any time, without notice. sk yworks makes no commitment to update the materials or information and shall have no responsib ility whatsoever for conflicts, incompatibilities, or other diff iculties arising from any future changes. no license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document . skyworks assumes no liability for any materials, products or information provided hereunder, including the sale, distribution, re production or use of skyworks products, information or mate rials, except as may be provided in skyworks terms and conditions of sale. the materials, products and information are pr ovided as is without warranty of any ki nd, whether express, implied, statutory, or otherwise, including fitness for a particular purpose or use, merchantability, performance, qualit y or non-infringement of any intellectual property right; all su ch warranties are hereby expressly disclaimed. skyworks does not warrant the accu racy or completeness of the information, text, graphics or other items contained within these ma terials. skyworks shall not be liable for any damages, including but not limited to any special, indirect, incidental, statutory, or consequentia l damages, including without limitation, lost revenues or lost profits that may result from the use of the materials or information, whet her or not the recipient of mat erials has been advised of the possibility of such damage. skyworks products are not intended for use in medical, lifesavi ng or life-sustaining applications, or other equipment in which the failure of the skyworks products could lead to personal injury, death, physical or environmental damage. skyworks customers using or 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. customers are responsible for their products and applications us ing skyworks products, which ma y deviate from published specifi cations as a result of design defects, errors, or operation of products outside of published pa rameters or design specifications. customers sh ould include design and operating safeguards to minimize these and other risks. skyworks assumes no liability for applications assistance, customer product design, or damage to any equipment resulting from the use of skyworks products outsid e of stated published specifications or parameters. skyworks, the skyworks symbol, breakthrough simplicity, dcr, he lios, hip3, innovation to go, intera, ipac, lipa, polar loop, and system smart are trademarks or registered trademarks of skyworks solutions, inc., in the united states and other count ries. third-party brands and names are for identification purpose s only, and are the property of their respective owners. additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference.
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