CX20865 far field voi ce input processor soc turnkey solution enabling far field voice control and telepresence applications features ? multi-vendors speech recognition hit rate optimization ? skype tm tv certified far field voice processing with watch live and talk ? ? selective source pickup? noise rejection technology ? stereo acoustic echo canceller supporting 2.1 or 2.2 ch system ? speech detection and buffer during system stand-by ? voice trigger and wake on voice, optional ? on-chip 32-bit digital audio processor ? 18-bit microphone adc with 106 db full path dynamic range ? raw audio sample rates: 8 ~96 khz ? 0.125 db analog front end gain resolution ? independent microphone bias for low cross talk ? serial data interface (i 2 s/pcm) ? usb full speed, 2.0 uac compliant, asynchronous data transfer ? asynchronous src and sync buffers ? i 2 c and uart control interface ? serial eeprom interface ? integrated dc/dc for power management ? 9x9mm 169 bga package, rohs compliant applications ? voice interactive smarttv/stb ? voice controlled appliance ? telepresence ? far field audio capturing ? game console ? automotive part number CX20865 description far field voice input processor soc description the CX20865 is the industry leading far field voice input processor soc, designed for voice interactive applications. th e device includes high-performance microphone adcs, powerful dual core 32-b it hardware dsp, and integrated power management. combined with our advanced far field voice processing algorithms, it is the ideal turnkey solution for adding voice control, voice search, telepresence functionalities to smarttv, set-top-box, and game console appliances. the CX20865 supports a microphone array with up to four synchronized adcs and programmable preamplifiers. each preamp lifier is paired with a dedicated bias supply to eliminate crosstalk. the entire input path guarantees 106 db dynamic range, which maximizes speech to noise ratio with low boost and prevents microphone saturation. conexant's proprietary far field voice processing algorithms take advantage of the high-performance processing core and adcs to deliver superior voice interactive experiences in the most challenging room environments. the full-featured selective source pickup (ssp) algorith m significantly improves t he voice control accuracy in noisy situations, such as retail showroom s, living and family rooms, and other gathering places. the voice processing c hain also supports multithread processing streams, independently opti mized for voice communication and automatic speech recognition. the CX20865 device has an integrated dcdc converter, supporting dynamic voltage scaling (dvs), and frequency scaling mechanisms to reduce power consumption. when the adc and dsp are active in voice-on-wake mode, the device consumes less than 110 mw, well below the 0.5 watt ec 1275/2008 requirement for standby power. simplified block diagram
electrical characteristics ordering information parameters comment minimum nominal maximum unit power supplies supply voltage 0.9 1.0 1.05 v supply voltage 1.72 1.8 1.98 v supply voltage 2.97 3.3 3.63 v microphone input ta = 25c, input supply = 3.3 v, 1 khz signal, fs = 48 khz, pga gain = 0 db input signal level 1x avdd 3.3 v snr 106 db thd -85 db power supply reje ction ratio 80 db mute attenuation 80 db input resistance 500 k bias voltage 1.5 4 v bias current 10 ma ordering number part number description package tbd CX20865 far field voice input processor soc 9x9 mm 169 bga ? 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 paparticular purpose and non-infringement. conexant shall not be liable for any special, indirect, incidental or consequential damages as a result of its use. 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-203141
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