skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 200644a ? skyworks proprietary and confidential information ? products and product informatio n are subject to change witho ut notice. ? february 6, 2007 product summary SKY77531 txCrx ipac ? fem for quadCband gsm/gprs applications ? quad-band cellular handsets encompassing - class 4 gsm850/900 - dcs1800/pcs1900 - class 12 gprs multi-slot operation features ? high efficiency - 48% (gsm850/900) - 41% (dcs1800/pcs1900) ? low transmit supply current - 1.26 a (gsm850/900) - 0.90 a (dcs1800/pcs1900) ? 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 switch affords high linearity, low insertion loss, and less than 20 a supply current in receive modes ? small outline: 6 mm x 8 mm ? low profile: 1.05 mm ? compatible with multiple logic families ? low apc current: 25 a description the SKY77531 is a transmit and receive front-end module (fem) with integrated power amplifier control (ipac ? ) for quad-band cellular handsets comprising gsm850/900 and dcs1800/pcs1900 operation. designed in a low profile, compact form factor, the SKY77531 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 gsm850/900 pa bloc k and a dcs1800/pcs1900 pa block, impedance- matching circuitry for 50 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 band and the other pa block support s the dcs1800/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 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 cel, gsm, dcs and pcs modes of operation. transmit enable tx_en and transmit switch enable tx_sw_en control 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 txCvco while the vco is being tuned prior to the transmit burst. the SKY77531 is compatible with logic levels from 1.2 v to vcc for bs1, bs2, tx_en, and tx_sw_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. figure 1. SKY77531 functional block diagram
ordering information model number manufacturing part number product revision package operating temperature SKY77531 SKY77531 mcm 6 x 8 x 1.05 mm C20 c to +85 c revision history revision date description a february 6, 2007 initial i ssue - advance information b may 30, 2008 revise: features (p1) low profile 1.2 to 1.05; figure 1 add: green tag (p1) ordering information; revision history ? 2007C2008, 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 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. skyworks may change its documentat ion, products, services, specific ations or product descriptions at any time, without notice. skyworks 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, merchantabilit y, performance, quality or non-infringeme nt of any intellectual property right; all such warranties are hereby expressly disclaimed. skywo rks does not warrant the accuracy or completeness of the information, text, graphics or other items contained within these materials. skyworks shall not be liable for any damages, including but not li mited to any special, indirect, incidental, statutory, or con sequential damages, including without limitation, lost revenues or lost profits that may result from the use of the materials or info rmation, whether or not the reci pient of materials 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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