product summary CX74070: rx asic for pcs and gps mobile handset applications applications ? ? ? ? ? ? ? ? ? ? pcs and gps phones gps receivers features gps lna provided external resistor to adjust lna bias current independent pcs and gps mixers 90 db dynamic range vga i/q demodulator 100 to 600 mhz vhf oscillator battery cell operation (2.7 v < vcc < 3.3 v) 6 x 6 mm, 40-pin rflga? package with down-set paddle description the CX74070 application-specific integrated circuit (asic) is a single intermediate frequency (if), dual-mode, dual-band receiver intended for use in code division multiple access (cdma) phones in personal communications system (pcs) and global positioning system (gps) bands. the CX74070 is a highly integrated super-heterodyne receiver. except for the surface acoustic wave (saw) filters and matching components, the device incorporates all the components required to implement the receiver chain, from the low-noise amplifier (lna) to the in-phase and quadrature (i/q) demodulator stages. a pcs lna and a gps lna are in the front-end receiver. after rf lna signal amplification and filtering, the signal is mixed down to an if. the pcs mixer has balanced outputs for the if saw filter and the gps mixer has a differential output for an external l-c bandpass if filter. the if signal is amplified by a variable gain amplifier (vga) and fed to an i/q demodulator, resulting in baseband i/q signals that interface with a baseband analog processor. the vga has a minimum dynamic range of 90 db with a control voltage range of 0.3 to 2.5 v, which is common to all modes. a vhf oscillator operates with external tank circuits to provide local oscillator (lo) frequencies for the i/q demodulator in the pcs and gps bands. the noise figure, gain, and third order input intercept point (iip3) of each stage have been optimized to meet the system requirements for pcs mode according to tia/eia-98-c and for gps mode according to tia/eia-916. the asic design employs bicmos technology for low cost, high performance, and a high level of integration. a block diagram of the CX74070 is shown in figure 1. skyw orks so lut i ons , inc . pro p r i et ary an d c o nf ide n t i a l 1 103085a [781] 376-3000 i fax [781] 376-3100 i sales@ skyw o rksinc. c om i www.skywor ksinc.c om february 4, 2003
product summary i CX74070 pcs_mix_in pcs_lo_out gps_lna_out pcs_lna_out pcs_lo_in gps_mix_in i+ pll i? q+ q? pcs_if? gps_lo_in pcs_if+ gps_if? gps_if+ vga_in+ vga_in? gps_vga_in pcs_lna_in gps_lna_in vco_tank? vco_tank+ c1351 90 o 2 figure 1. CX74070 receiver asic block diagram ordering information model name manufacturing part number product revision pcs and gps receiver CX74070-11 ? 2002, 2003 skyworks solutions, inc. all rights reserved. information in this document is pr ovided in connection with skyworks solutions, inc. ("skyworks") products. these materials are provided by skyworks as a service to its customers and may be used for informationa l purposes only. skyworks assumes no responsibility for errors or omissions in these materials. skyworks may make changes to its products, specificat ions and product descriptions at any time, without notice. skyw orks makes no commitment to update the information and shall have no responsib ility whatsoever for conflicts, in compatibilities, or other dif ficulties arising from future changes t o it s pr oduct s and pr oduct descr i pt ions. no license, express or implied, by estoppel or otherwise, to any int e llect ual pr oper t y r i ght s is gr ant e d by t h is document . exce pt as may be pr ovided in skyworks terms and conditions of sale for such pr oducts, skyworks assumes no liability whatsoever. th es e ma teria ls a r e prov ided "a s is " with out wa rra nty of a n y k i nd, eith er expres s or implied, rela ting to s a l e a nd/or us e of skyworks? products including warra nties rela ting to fitnes s for a particular purpose, merchanta bility, performance, quality or non-infringement of any patent, copy right or other intellectual property ri ght. skyworks further does not warrant the a ccura cy or completenes s of the informa t ion, text, gra p hics or other items conta i ned within thes e ma teria ls . s k y work s s h a ll not be liable for any special, indirect, in cidental, or consequential damages, includ ing with out limita tion, los t rev e nues or los t profits th a t ma y res u lt from th e us e of th es e ma teria ls . s k ywor ks? pr oduct s ar e not int e nded f o r use in medical, lif esav ing or life-sustaining applicatio ns. skyworks customers using o r selling skyworks? pr oduct s f o r use in such applicat ions do so at t h eir own r isk and agree to fully indemnify skyworks for any damages resulting f rom such improper use or sale. the following are trademarks of skyworks solutions, inc.: skywor ks?, the skyworks symbol, spr?, single package radio?, and bre akt hr ough simplicity?. product names or services list ed in this publication are fo r identification purposes only, and may be trademarks of t h ir d par t ies. thir d - par t y br ands and names ar e t h e pr op erty of their respective owners. rflga? is a trademark of conexant systems, inc. additional information, posted at www.skywor ksinc.com, is incorporated by reference. general information skyworks solutions, inc. 20 sylvan rd. woburn, ma 01801 www.skyworksinc.com
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