skyworks solutions, inc. ? phone [ 781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 200596a ? skyworks proprietary and confidential information ? products and product informatio n are subject to change witho ut notice. ? april 18, 2008 1 product summary SKY77521 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 - edge polar modulation - triple band wcdma antenna switch support features ? small outline: 7 mm x 6 mm ? very low profile: 1 mm max. ? 30-pad package ? low input power range - 0 to 6 dbm ? high efficiency - gsm850 40% - gsm900 40% - dcs 34% - pcs 34% ? tx-vco-to-antenna and antenna- to-rx-saw filter rf interface ? tx harmonics below -35 dbm ? wideband envelop control path ? input/output matching 50 internal ? low apc current: 20 a ? high impedance control inputs 15 a, typical description SKY77521 is a transmit and receive front end module (fem) designed in a very low profile (1 mm), 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 edge polar modulation. 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, high linearity- low insertion loss switches, 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 highly linear antenna switch. the ingap/gaas die, switch die, silicon (si) contro ller 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 SKY77521 are internally matched to a 50 load to reduce the number of external components for a quad-ba nd design. extremely low leakage current (10 a, typical) of the fem maximizes handset st andby time. band selection and control of transmit and receive rf signal flows are performed by use of four external control pads. see figure 1 shown below. mode of operation tx, rx, band (gsm850, gsm900, dcs, pcs, and umts) is controlled with 4 logic inputs: bs1, bs2, mode, and enable. proper timing of the txen input and the vapc input ensures high isolation between the antenna and tx-vco while the vco is being tuned prior to the transmit burst. the enable input controls the initial turn-on of the pac circuitry to minimize battery drain. the integrated power amplifier control (pac) function provides envelope amplitude control by reducing sensitivity to input drive, temperature, power supply, and process variation.
product summary SKY77521 tx-rx fem for quad-band gsm / gprs / edge C triple band wcdma antenna switch support figure 1. SKY77521 functional block diagram ordering information model number manufacturing part number product revision package operating temperature SKY77521 SKY77521 7x6 mcm C20 c to +100 c revision history revision level date description a april 18, 2008 initial release ? 2008, 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 by the customer. skyworks a ssumes no responsibility for errors or omissions in these mater ials. skyworks may make changes to its documentation, products, specifications and product descriptions at any time, without notice. skyworks makes no commitment to update the information and shall have no responsibility whatsoever for conflicts, incompatibilities, or other difficulties aris ing from future changes to its documentation, products, specifications and product descriptions. no license, express or implied, by estoppel or otherwise, to an y intellectual property rights is granted by or under this docum ent. except as may be provided in skyworks terms and conditions of sale for such products, skyworks assumes no liability whatsoever in association with its document ation, products, specification s and product descriptions. these materials are provided as is without warranty of any ki nd, either express or implied or otherwise, relating to sale and /or use of skyworks products including warranties relating to fitness for a particular purpos e, merchantability, performance, quality or non-infringement of any patent, copyright or other intellectual property right. skyworks further does not warrant the accuracy or completen ess of the information, text, graphics or other items contained within these materials. skyworks shall not be liable for any damages, including special, indi rect, incidental, or consequential damage s, including without limitation, lost revenues or lost profits that may result from the use of these materials whether or not the recipien t of materials has been adv ised of the possibility of such damage. skyworks products are not intended for use in medical, lifesavi ng or life-sustaining applications. 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 an y damages resulting from such improper use or sale. the following are trademarks of sk yworks solutions, inc.: skyworks ? , the skyworks logo, and breakthrough simplicity ? . product names or services listed in this publication are for identification purposes only, and may be trademarks of skyworks or other third parties. third-party brands and names are the property of their respective owners. additional information, posted at www.skyworksinc.com, is incorporated by reference.
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