wireless communications products distinguishing features tri-mode, dual-band functionality rf to i/q integration three battery-cell operation (2.7v < vcc < 3.6v) pcs bypass lna with nf 1.9 db typical three-step cellular lna with nf 1.8 db typical at maximum gain dual 200 to 600 mhz 2nd if oscillators 7mm x 7mm land grid array (lga) chipscale package cdma receive rflc conexant delivers rf chipsets for 2g and 3g cdma applications the CX74001 offers the highest level of integration in a tri-mode, dual- band receiver (rx) rfic. the device is designed to meet the needs of both 2g and 3g cdma systems. specifically targeting the cdmaone, cdma2000, and amps markets in the u.s. and korean cellular, japan cellular, korean pcs and u.s. pcs bands. the CX74001 is also designed to be suitable for wideband cdma (wcdma) applications in the imt-2000 band. programmable linearity is included in the rf front end to optimize power consumption at various input levels. a three-step cellular lna, bypass pcs lna, and a seperate enable for the internal vco increases system performance and standby times. the device is a highly integrated super-heterodyne receiver. it incor- porates all the components required to implement the receiver front end and the in-phase and quadrature (i/q) demodulator stages, except for the filter blocks. it has two internal lnas one for the cellular band and another for the pcs band. the device also has separate mixers for the amps, cdma and pcs bands. the amps mixer has differential outputs that are combined externally as a single-ended output for the intermediate frequency (if) surface acoustic wave (saw) filter. the cellular and pcs mixers have balanced outputs for the cdma if saw filters. the mixers are fol- lowed by an if variable gain amplifier (vga) and an i/q demodulator. the outputs from the filters are combined through separate buffers at the input of the vga. the buffers are enabled depending on the selected mode. the vga has a gain control range greater than 90 db. the device has two very high-frequency (vhf) oscillators that oper- ate with external tank circuits. they provide signals to the local oscil- lator (lo) for the i/q demodulator in the cellular and pcs bands. CX74001
features and specifications the CX74001, along with conexant s cx74002 transmit rfic, a conexant power amplifier module, and conexant s baseband analog processor forms a complete rf subsystem that interfaces with the most common cdma base- band devices. www.conexant.com further information literature@conexant.com (800) 854-8099 (north america) (949) 483-6996 (international) order # 101065a 00-0889 wireless communications printed in usa world headquarters conexant systems, inc. 4311 jamboree road newport beach, ca 92660-3007 phone: (949) 483-4600 fax 1: (949) 483-4078 fax 2: (949) 483-4391 americas u.s. northwest ?santa clara phone: (408) 249 -9696 fax: (408) 249 -7113 u.s. southwest los angeles phone: (805) 376 -0559 fax: (805) 376 - 8180 u.s. southwest newport beach phone: (949) 483-9119 fax: (949) 483-9090 u.s. san diego phone: (858) 713-4730 fax: (858) 713-4008 u.s. north central illinois phone: (630) 773-3454 fax: (630) 773 -3907 u.s. south central/mexico texas phone: (972) 871-1920 fax: (972) 871-8910 u.s. northeast massachusetts phone: (978) 367-3200 fax: (978) 256 - 6868 u.s. carolinas north carolina phone: (919) 858 -9110 fax: (919) 858 - 8669 u.s. southeast/south america florida phone: (727) 799 - 8406 fax: (727) 799 - 8306 u.s. mid-atlantic pennsylvania phone: (215) 244- 6784 fax: (215) 244- 9292 canada ontario phone: (613) 271-2358 fax: (613) 271-2359 eur ope europe central germany phone: +49 89 829 -1320 fax: +49 89 834-2734 europe north england phone: +44 1344 486444 fax: +44 1344 486555 europe israel/greece phone: +972 9 9524000 fax: +972 9 9573732 europe south france phone: +33 1 41 44 36 51 fax: +33 1 41 44 36 90 europe mediterranean italy phone: +39 02 93179911 fax: +39 02 93179913 europe sweden phone: +46 (0) 8 5091 4319 fax: +46 (0) 8 590 041 10 europe finland phone: +358 (0) 9 85 666 435 fax: +358 (0) 9 85 666 220 asia pacific taiwan phone: (886 -2) 2-720-0282 fax: (886 -2) 2-757- 6760 australia phone: (61-2) 9869 4088 fax: (61-2) 9869 4077 china central phone: 86 -21- 6361-2515 fax: 86 -21- 6361-2516 china south phone: (852) 2 827- 0181 fax: (852) 2 827- 6488 china south (satellite) phone: (86) 755 -5182495 fax: (86 ) 755 -5183024 china north phone: (86 -10) 8529 - 9777 fax: (86 -10) 8529 - 9778 india phone: (91-11) 692-4789 fax: (91-11) 692 -4712 korea phone: (82-2) 565-2880 fax: (82-2) 565-1440 korea (satellite) phone: (82-53) 745-2880 fax: (82-53) 745-1440 singapore phone: (65) 737 7355 fax: (65) 737 9077 japan phone: (81-3) 5371 1520 fax: (81-3) 5371 1501 CX74001 rx asic block diagram conexant and the conexant symbol are trademarks of conexant systems, inc. CX74001 48-pin 7mm x 7mm lga package product features two on-chip oscillators, one for cellular and one for pcs bands vga has a minimum dynamic range of 90 db with a control voltage range of 0.2 to 2-7 volts the appropriate signal path is switched internally to the device, eliminating the need for off-chip switching three-step gain lna designed to meet intermodulation distortion specifications for cdma applications three independent mixers, one for the pcs band and two for the cellular band, designed to operate with very low lo power of -10dbm applications cellular and pcs-band phones cdmaone, cdma2000 and amps modes in the following bands: u.s. cellular japan cellular u.s. pcs korea pcs wcdma in the imt-2000 band
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