audio speakers-on-a-chip conexants portfolio includes a comprehensive suite of semiconductor solutions for communications and consumer applications. the CX20707 is one of conexants speakers-on-a-chip (spoc) embedded audio solutions designed for voice communication applications, such as two-way intercoms, security intercoms, and doorphone systems. the device features a proprietary on-chip digital signal processor (dsp), codec, mono class-d driver, i 2 s and i 2 c interfaces, high performance 24-bit dacs and adcs, a range of digital and analog input/output channel selections for flexible routing and mixing, and a mono capless headphone driver in a cost-effective single-chip package. the dsp runs a suite of turnkey audio and voice enhancement algorithms that dramatically improve sound quality. this product is part of the cx2070x spoc family, which includes cx20702, cx20703, cx20704, cx20705, cx20706 and cx20709. the device features multiple high performance 24-bit dacs for mono speaker output, multiple 24-bit high performance adcs supporting mono microphone and mono line input, mono capless headphone output or mono single-ended/ differential line output, support for bi-directional 1 2 s, pcm, s/pdif-out with independent sampling rates, and a range of digital and analog input/output channel selections for flexible routing and mixing. different audio sampling rates ranging from 8 khz to 96 khz are generated directly from the master clock without the need for external pll. the mono class-d amplifier drives a maximum of 2.5 w (average) from the integrated amplifier. the device can be controlled and configured by both read and write capability through i 2 c and serial peripheral interface (spi), or uart. the on-chip dsp runs a suite of innovative conexant proprietary voice processing algorithms and audio post processing effects that that delivers a clear, rich and full sound experience to the end user and frees-up processing power for other applications without compromising on cost and future firmware scalability. key audio innovations include subband acoustic echo suppression and cancellation, noise reduction, subband line echo cancellation, equalizer, dynamic range compression, and mic auto gain control. the embedded spoc configuration toolbox allows for fast configuration and performance optimization. the CX20707 turnkey solution eliminates the need for a multiple-chip reference design, making it easy and economical for manufacturers to design products for high quality intercom applications. a complete evaluation kit with reference board and all the necessary technical documents and software is available. the soc is packaged in an environmentally-friendly, rohs/green-compliant 76-pin qfn (quad flat no leads) package. applications ? two-way intercom ? security intercom ? doorphone systems distinguishing features ? 24-bit dac/adc, snr 102 db, thd - 92 db at 48 khz 3.3 v ? programmable on-chip proprietary dsp C subband acoustic echo suppression and cancellation C noise reduction for inbound speech (far end) and outbound speech (near end) C subband line echo canceller C dynamic loudness adaptor C mic auto gain control C digital equalizer (10 bands/channel) C dynamic range compression ? one 2-wire i 2 c or 4-wire spi slave, or uart interface for external mcu ? 2.5 w btl mono class-d speaker amplifier ? mono microphone interfaces with on-chip bias supply ? flexible power management ? audio sample rate: 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48, 64, 88.2, 96 khz part number CX20707 description speakers-on-a-chip with on-chip voice/audio dsp, integrated i 2 s/ i 2 c codec, and mono class-d amplifier speakers-on-a-chip with on-chip voice/audio dsp, integrated i 2 s/i 2 c codec, and mono class-d amplifier CX20707 free datasheet http:///
? 2009 conexant systems, inc. all rights reserved. conexant and the conexant logo are registered trademarks of conexant systems, inc. all other trademarks are owned by their respective owners. although conexant strives for accuracy in all its publications, this material may contain errors or omissions and is subject to change without notice. this m at eria l is p rovided a s is and without an y exp ress or implied w arrant ies, includin g merch antabilit y, fi tn ess for a pa r ticular purpose and non-infringement . conexant shall not be liable for any special, indirect, incidental or consequential damages as a result of its use. CX20707 interface diagram dma dsp memory dsp dma dac dac adc controller dma jack sense clock circuitry bias generator mon adc pcm/i 2 s clk rx_ws rx_dat tx_ws/sdif tx_dat eeprom clk eeprom data spi i 2 c slave uart scl rx tx csn miso mos/sda gpio 0 gp o 1 matrix 0 matrix 1 matrix 2 volume voltage monitor se or diff 10 k 7 line 2.5w class-d se or diff 600 7 or 10 k 7 line capless hp out 32 7 mic in xtal in/ master in xtal out sense mic bus 3 adc se or diff line in se or diff line in se line in m m m gpio 2 gpio 3 gpio 4 09-2912 audio speakers-on-a-chip www.conexant.com general information: u.s. and canada: (888) 855-4562 international: 1+ (949) 483-3000 headquarters 4000 macarthur blvd. newport beach, ca 92660 doc# pbr-202455 CX20707 f eatures codec ? 5-wire digital audio i/o (i2s/pcm/spdif), supporting full-duplex independent sampling rates s /ne wire) 2 c or 4-wire spi slave interface for external mcu s 524 interface s ight 0)/pins s 74,monolass 3peaker mpliler s 3ingleended or differentialmonoanalogaudioinput s -ono microphone interfaceswith onchipiassuppl s )ntegrated m7headphone driverwith acksense s 3ingleended or differentiallineout s it 3.2 d 4(datk( 6 s udio samplerate 88.2, 96 khz s ddnamicrangewith percent 4(.at load s 3pread 3pectrum for llterless low-)output s it multiplexedtosupportanalog volume potentiometer and dc level detection s lexile powermanagement s 6ariale master clockrates dsp ? subband acoustic echo suppression and cancellation ? noise reduction for inbound speech (far end) and outbound speech (near end) s namic loudnessadaptor s -ic autogaincontrol s igital parametric equalier andschannel s namic rangecompression spoc confguration toolbox ? fast confguration tool via usb-to-i 2 c from pc s evice conlgurationand30parameteradustment s /utput log for convenient-5programming the CX20707 is offered in a 76-pin qfn package conexant product portfolio conexants comprehensive product portfolio includes solutions for imaging, audio, embedded modem and video surveillance applications. free datasheet http:///
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