skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 3100 ? sales@skyworksinc.com ? www.skyworksinc.com 203476 a ? skyworks proprietary information ? products and product information are subject to change wi thout notice. ? march 3, 2015 1 product summary sky 77912 - 21 t x - rx f ront - e nd m odule for quad - band gsm / gprs / edge w / 10 linear trx switch ports , dual - band td - scdma , and tdd lte band 39 applications ? cellular handsets encompassing quad - band gsm/edge , dual - band td - scdma , and tdd lte - class 4 gsm850/900 - class 1 dcs1800 / pcs1900 - class 12 gprs multi - slot operation - linear edge operation - td - scdma bands 34/39 - tdd lte band 39 features ? small, low profile package - 5. 5 mm x 5. 3 mm x 0. 8 mm max - 38- pad configuration ? mipi ? rffe control with dual - standard support - user - selectable register mappings - linear or vramp - based gmsk power control ? rf ports internally matched to 50 load ? high efficiency (inclusive of coupler) ? tx harmonics below C 40 dbm ? supports apt, buck dc - dc supply ? ten low insertion loss /high linearity trx switch ports ? rf input switching to 3g/4g path ? integrated broadband directional coupler ? integrated noise suppression notch filter for wifi coexistence ? built - in iec - compliant antenna esd protection ? high impedance control inputs: 20 a, maximum ? current limiting and over - voltage protection for ruggedness and extended battery life ? power control circuitry built - in for improved trp variation description sky7791 2 - 21, a t x / r x front - end module (fem) , o ffers the complete transmit vco - to - antenna and antenna - to - receive saw filter solution for advanced cellular handsets comprising quad - band gsm, gprs , edge multi - slot operation, and td - scdma and tdd lte transmission. t he fem full y enables broadband 3g/4g rf switch - through , outward switching of the power amplifier (pa) rf inputs, ten transmit / receive (trx) antenna switch ports , and an integrated directional coupler. a new multi - standard cmos controller provides pa band/mode selection and bias control , includ ing the mobile industry processor interface (mipi ? ) rffe logic , and switch decoder circuitry. th e controller supports user - option al control of linear rf or analog vramp of the gmsk envelope. a distinct mipi register mappin g included in this data sheet provide s for each of these control paradigms, including associated approaches to pa and switch control. the heterojunction bipolar transistor (hbt) pa blocks are fabricated in gallium arsenide ( gaas ) . the low band (lb) pa tran smits in the gsm850/900 bands. the high band (hb) pa supports dcs, pcs, td - scdma bands 34/39, and tdd lte band 39. the hbt, switch, and controller die , and passive components mount onto a multi - layer laminate substrate and the entire assembly encapsulated with plastic over - mold. built into the sky77912 - 21 is a complete features set for state - of - the - art performance and minim al phone board complexity , including pa over - voltage and over - current protection , 50 ohms matching and zero dc offset on all rf pins , tr x high linearity / low loss switching and high off - state isolation , integrated directional coupler , iec ruggedness at antenna output , lb and hb input switching for alternate rf routing 3g/4g tx paths , power supply pads shared between lb and hb , and ultra - low leakage currents for long standby times. selecting the linear - gmsk operation standard disables vramp input so all pa biasing depends only on mipi mode selection . th e transmitted envelope is a linear function of rf input. selecting vramp - enabled operation, the pa controller provides vramp control of the gmsk envelope and reduces sensitivity to input drive, temperature, power supply, and process variations. skyworks finger - based integrated power amplifier control (fb - ipac ) minimizes output power variation into mismatch. in edge and td - scdma / tdd lte linear modes, vramp voltage and mipi - based bias settings jointly optimize pa linearity and efficiency.
or d ering information product name order nu mber evaluation board part number sky 77912 - 21 tx - rx front - end module sky 77912 - 21 n/a ? 2015 , skyworks solutions, inc. all rights reserve d . 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. skyworks may change its documentation, products, services, specifications or product descriptio n s at any time, without notice. skyworks makes no commitment to update the materials or information and shall have no responsibility whatsoever for conflicts, incompatibilities, or other di fficulties arising from any future changes. no license, whether exp ress, 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, reproduction or use of skyworks products, information or materials, except as may be provided in skyworks terms and conditions of sale. the materials, products and information are provided as is without warranty of any kind, whether express, implied, statutor y, or otherwise, i ncluding fitness for a particular purpose or use, merchantability, performance, quality or non - infringement of any intellectual property right; all such warranties are hereby expressly disclaimed. skyworks does not warrant the accuracy or completeness of t he information, text, graphics or other items contained within these materials. skyworks shall not be liable for any damages, including but not limited to any special, indirect, incidental, statutory, or consequent ial damages, including without limitation, lost revenues or lost profits that may result from the use of the materials or information, whether or not the recipient of m aterials has been advised of the possibility of such damage. skyworks products are not intended for use in medical, lifesaving 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 d o 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 using skyworks products, which may deviate from published speci fications as a re sult of design defects, errors, or operation of products outside of published parameters or design specifications. customers should include design and operating safeguards t o minimize these and other risks. skyworks assumes no liability for applications as sistance, customer product design, or damage to any equipment resulting from the use of skyworks products outside of stated p ublished specifications or parameters. skyworks and the skyworks symbol are trademarks or registered trademarks of skyworks solutio ns, inc., in the united states and other countries. third - party brands and names are for identification purposes only, and are the property of their respective owners. additional information, including relevant ter ms and conditions, posted at www.skyworksi nc.com, are incorporated by reference.
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