CX20709 usb/i 2 s audio codec, audio/voice dsp, stereo class-d, headphone driver overview the CX20709 is one of conexant's audio/ voice dsp codec family solutions with highly integrated hardware dsp, codec, class-d amplifier, usb, i 2 s, s/pdif, and i 2 c interfaces. the solution features a suite of turnkey audio and voice enhancement algorithms designed for convergence audio entertainment and voice communication applications, such as pc docking system/ sound-bar, portable multimedia/navigation devices, smart home intercom system, media ip phone, and unified communication peripherals. the CX20709 offers multiple digital data and control i/o for flexible peripheral or mcu/ mpu connectivity. the device features one 4-wire and one 5-wire digital audio interface, which can be mixed or multiplexed to support bi-directional i 2 s, pcm, and s/pdif. the device can be controlled and configured by both read and write capability through i 2 c and spi. the device features a usb 2.0 compliant audio class interface (full-speed for data and control) and a uart interface for the external mcu/mpu interface. the device integrates three high- performance 102 db snr, 24-bit dacs for 2.1ch speaker output, capless headphone output, and single-ended/differential line- output. the analog input paths feature four high performance, 24-bit adc supporting up to four microphones or three stereo line- inputs. 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 power-efficient integrated class-d stereo amplifier operates at 5 v or 3.3 v with an optional maximum power of 2.8 w at a 4 load. for intercom application, the mono line-out supports 600 drivers, which can drive the isolation transformer directly without an external operational amplifier. the on-chip dsp is designed to run a suite of voice processing algorithms and audio post processing effects offered by conexant. the device features conexant's soundbar algorithm for usb 5.1 channel sound-bar enhancement. the audio designer has the ability to adjust and optimize performance on the target system by using the spoc configuration toolbox. the CX20709 operates at supply voltages down to 3.3 v for analog and 1.8 v for the digital core. an advanced power management scheme can be configured to achieve <7.55 mw in sleep mode. applications ? pc speakers system ? lcd display/soundbar ? home automation/intercom ? pnd/pmp ? multi media ip phone ? telepresence/unified communication device ? embedded applications part number CX20709 description usb/i 2 s audio codec, au- dio/voice dsp, stereo class-d, headphone driver ordering number part number package description dsac-l709-21ch CX20709-21z 76qfn dsac-l709-12ch CX20709-12z 76qfn not recommended for new design CX20709-evk2 CX20709-evk2 CX20709-21z evaluation kit CX20709-evk2-in CX20709-evk2-in CX20709-21z intercom daughter board all devices are lead-free (pb free) and rohs compliant
codec features functional block diagram conexant product portfolio conexant?s comprehensive product portfolio includes solutions for imaging, audio, video surveillance, and embedded modem applic ations. conexant products are not intended for use in medical, lifesaving or life sustaining appli- cations. conexant customers using or selling conexant products for use in such applica- tions do so at their own risk and agree to fully indemnify conexant for any damages resulting from such improper use or sale. the following are trademarks of conexant systems, inc.: conexant ? and the conexant c symbol, smartaudio, smartjack, smartcd, and smartdaa ? . product names or services listed in this publication are for identification purposes only, and may be trademarks of third parties. third-party brands and names are the property of their respective owners. for additional disclaimer information, please consult conexant's legal information post- ed at www.conexant.com, which is incorporated by reference. reader response : conexant strives to produce quality documentation and welcomes your feedback. please send comments and suggestions to tech.pubs@conexant.com. for technical questions, contact your local conexant sales office or field applications engi- neer. 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-202964 ? 2012 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 material is provided as is and without any express or implied warranties, including merchant ability, fitness for a particular purpose and non-infringement. conexant shall not be liable for any special, indirect, incidental or consequential damages as a result of its use. dma dsp x2 memory dma dac dac dac adc adc pcm/i2s pcm/i2s controller spi i2c slave uart jack sense clock circuitry bias generator mon adc i2s_pcm_1_clk i2s_pcm_1_rx_ws i2s_pcm_1_rx_dat i2s_pcm_1_tx_ws/spdif_out usb i2s_pcm_1_tx_dat i2s_pcm_2_ws i2s_pcm_2_clk/dmic_clk i2s_pcm_2_rx_dat/dmic_in/spdif_in i2s_pcm_2_tx_dat usb_dp usb_dm usb_5vdet i2c_spi_scl uart_rx uart_tx nvclk nvdat i2c_spi_csn spi_miso i2c_sda/spi_mosi gpo 0 gpo 1 ks0 ks1 ks2 volume line_out_lp line_out_ln (se or diff, line_out_ln 10 k line) classd_lp classd_ln (2.5w class-d 4 out) hp_out_r (capless hp out 32 ) mono_out_n (se or diff, 600 or 10 k line) hp_out_l (capless hp out 32 ) mic_in_l mic_in_r micbias_l micbias_r xtli xtlo sense_a adc line_in_1l_lp (se or diff line in) mic_in2_l/line_in_3l m m m adc line_in_1r_rp (se or diff line in) mic_in2_r/line_in_3r m m m gpo2 gpo3 gpo4 (se or diff line in) line_in_2l_ln (se or diff line in) line_in_2r_rn pass_thru pass_thru volt_mon mono_out_p (se or diff, 600 or 10 k line) classd_rp classd_rn (2.5w class-d 4 out) line_out_rp line_out_rn (se or diff, line_out_ln 10 k line) i2c_en/mclk dmic_in dmic_clk dma l r mclk ? 4-wire and 5-wire digital audio i/o (i 2 s/ pcm/spdif), supporting full duplex independent sampling rates, master clock for optional pcm/i 2 s slave codec (spdif-in available in CX20709-21z) ? one 2-wire i 2 c and one 4-wire spi slave interface for external mcu ? usb 2.0 compliant full speed uac interface ? supporting dual usb playback end points (available in CX20709-21z) ? stereo digital microphone, up to 12 mhz clock rate (available in CX20709-21z) ? eight gpio pins ? 2.8 w x 2 btl filter-less stereo class- d speaker amplifier ? low emi class-d amplifier output with spread spectrum and common mode scrambler ? integrated 50 mw headphone driver with jack sense ? single-ended or differential line output ? separate mixed mono line-output for sub-woofer or intercom usage ? three single-ended stereo or one differential stereo analog audio input ? up to 4 microphone interfaces with on- chip bias supply (available in CX20709-21z) ? 24-bit dac/adc, snr 102 db, thd - 92 db at 48 khz 3.3 v ? in dsp mode, the processing will be limited the input and output to 16-bit effective resolution ? audio sample rate: 8,16, 22.05, 24, 32, 44.1, 48, 88.2, 96 khz ? 90 db dynamic range with 0.1% thd+n at 4 load ? 12-bit adc multiplexed to support analog volume potentiometer and dc level detection ? flexible power management ? variable master clock rates ? configurable on-chip proprietary voice/audio processing ? subband acoustic echo cancellation ? dual microphone beam forming ? noise reduction ? dynamic loudness adaptor ? microphone automatic gain control ? subband line echo cancellation (2-way intercom applications) ? digital equalizer (10 bands/ channel) ? dynamic range compression ? 4th order digital crossover for subwoofer line-out ? conexant sound-bar algorithm for usb 5.1 channel sound-bar enhancement (available in CX20709-21z) ? spoc configuration toolbox ? fast configuration via usb-to-i 2 c from pc ? data path, i/o setup, and dsp parameter adjustment ? output log for convenient mcu programming
|
