CX20865 Far Field Voice Processor AudioSmart™ Product Brief Turnkey Solution Enabling Far Field Voice Control and Telepresence Applications Product Overview Key Features The CX20865 is the industry-leading far field voice input processor SoC, designed for voice interactive applications. The CX20865 includes high-performance microphone ADCs, a powerful dual-core 32-bit hardware DSP, and integrated power management. Combined with Conexant’s advanced far field voice processing algorithms, the CX20865 is the ideal turnkey solution for adding voice control, voice search, and telepresence functionalities to SmartTV, STBs, and game console appliances. • Speech recognition optimization for leading ASR engines • • • • SkypeTV certified with Watch Live and Talk® SSP noise reduction technology Stereo AEC that supports a 2.1 or 2.2 CH system Low power, WoV mode with buffering and keyword detection Programmable 32-bit digital audio processor Four microphone ADCs with 106dB full path dynamic range Raw audio sample rates of 8kHz~96kHz 0.125dB analog front-end gain resolution Independent microphone bias for low crosstalk The CX20865 supports a microphone array with up to four synchronized ADCs and programmable pre-amplifiers. Each pre-amplifier is paired with a dedicated bias supply to eliminate crosstalk. The entire input path guarantees a 106dB 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 Smart Source Pickup (SSP) algorithm significantly improves the voice control accuracy in noisy situations, such as retail showrooms, living and family rooms, and other gathering places. The voice processing chain also supports multi-thread processing streams, independently optimized for voice communication and automatic speech recognition. • • • Serial data interface (I2S/PCM) Asynchronous SRC and sync buffers USB full-speed, 2.0 UAC compliant, asynchronous data transfer • • • • I2C and UART host interfaces Serial EEPROM interface Integrated DC-DC for power management 9x9mm 169-BGA package, RoHS compliant The CX20865 device has an integrated DC-DC converter that supports frequency scaling mechanisms to reduce power consumption. When the ADC and DSP are active in Voice-on-Wake mode, the device consumes less than 70mW, well below the 0.5W EC 1275/2008 requirement for standby power. System Block Diagram Applications • • • • • • Voice interactive SmartTV/STB Voice-controlled appliance Telepresence Far field audio capturing Game console Automotive Conexant Confidential • www.conexant.com • 020PBR00 CX20865 Far Field Voice Processor | AudioSmart™ Product Brief Electrical Characteristics Parameters Comment Minimum Nominal Maximum Unit Power Supplies Supply Voltage (VDD, PSUP_1V0, VDD_SW) - 0.9 1 1.05 V Supply Voltage (VDDO_1, VDDO_3, VDDO_4, VDDO_5, VDDO_6, VDDO_7) - 1.72 1.8 1.98 V Supply Voltage (VDDA3V3, VDDO_1, VDDO_3, VDDO_4, VDDO_5, VDDO_6, VDDO_7, PSUP3V3) - 2.97 3.3 3.63 V Microphone Input TA = 25°C, Input Supply = 3.3V, 1kHz Signal, fs = 48kHz, PGA Gain = 0dB Input Signal Level 1x AVDD - 3.3 - V SNR - - 106 - dB THD - - –85 - dB Power Supply Rejection Ratio - - 80 - dB Mute Attenuation - 80 - - dB Input Resistance - - 500 - k Bias Voltage - 1.5 - 4 V Bias Current - - - 10 mA Ordering Information Ordering Part Number Part Number Description Package CX20865-21Z CX20865 Far Field Voice Processor 9x9mm 169 BGA www.conexant.com Headquarters: 1901 Main Street, Suite 300 Irvine, CA,92614 General Information: U.S. and Canada: 888-855-4562 | International: 1 + 949-483-3000 © 2014 Conexant Systems, Inc. All rights reserved. 020PBR00