CX20672 HD Audio Codec with 2W Class-D, Capless HP, Retasking, and SPDIF Out Features 2 pairs of independent DACs and 3 pairs of independent ADCs Sampling rates include 16-bit, 44.1 kHz to 24-bit, 192 kHz for DACs, and from 16-bit, 44.1 kHz to 24-bit; 96 kHz for ADCs. Integrated 2 WRMS (per channel) Class-D stereo speaker amplifier Capless headphone eliminates BOM Two retaskable ports Stereo Digital Microphone interface Integrated boost for all microphones One independent SPDIF output Integrated regulators maximize performance Record Security Control Integrated headphone limiter (GS Mark) D-Flex Power Management Wake on PC BEEP PopShield eliminates pops and clicks Fidelity exceeds Microsoft WHCK requirements Jack sense detects up to 4 jacks Digital Mixer Compliant with all Intel High Definition Audio Specifications Selectable 1.5V/3.3 V link signaling Available in 40-QFN package Overview Conexant's CX20672 is a low-power, 102 dB SNR HD Audio codec with integrated 2WRMS stereo Class-D using Spread Spectrum dispersion technology to prevent EMI. Two independent pairs of DACs and three independent pairs of ADCs support multiStreaming and Real Time Communications applications. The audio fidelity of the device exceeds Microsoft Premium Logo requirements. A ProCoustic capless headphone driver delivers 31 mW per channel into 32 Ω loads and eliminates external DC blocking capacitors. Two retaskable ports are available allowing Microphone/Line in and Microphone/Line In/Line Out retasking. All output ports feature PopShield technology that eliminates pops and clicks. The codec features a stereo digital microphone interface that includes a hardware DClevel filter to remove DC offset and provides the clock output. One independent SPDIF output is available supporting sample rates up to 96 kHz, 16-24-bit resolution. Multiple GPIO's are provided, including speaker mute and EAPD functions. Integrated 5 V to 3.3 V and 3.3 V to 1.8 V Low Dropout (LDO) regulators guarantee high performance analog audio and clean power to internal digital blocks. Conexant's D-Flex power management allows the system to exceed the power savings specified in the Intel ECR 15B. The internal Wake-on-BEEP logic resumes the analog paths for the PC BEEP to the output ports. Block Diagram Software SmartAudio GUI Voice Processing Algorithms include end-to-end Noise Reduction, multiband AEC, Beam Forming, and Far Field Pickup 10 band Speaker EQ and DRC 3D Expander Third-party software support includes Andrea, Creative Labs, Dolby, Fortemedia, Waves MaxxAudio, SRS, and DTS Supports 32-bit/64-bit Windows/Linux Applications Notebooks and Ultrabooks All In One PCs Point Of Sale Systems Embedded Audio Part Number CX20672 Description Low-Power Codec SoC Analog Performance Characteristics Parameter Minimum Typical Maximum Units Line Outputs Full Scale Output Voltage 1.0 Vrms Dynamic Range (measured with -60 dBFS signal present) 97 Total Harmonic Distortion + Noise (THD + N), measured at -3 dBFS -90 Channel Crosstalk dBFS -93 dB 20000 Hz -84 Analog Frequency Response (+/- 3 dB at 20 Hz, +/- 1 dB at 20000 Hz) dBFS 20 Headphone Output Full Scale Output Voltage 1.0 Vrms Dynamic Range (measured with -60 dBFS signal present) 97 dBFS Total Harmonic Distortion + Noise (THD + N), measured at -3 dBFS -85 dB Channel Crosstalk -75 dBFS Analog Frequency Response (+/- 3 dB at 20 Hz, +/- 1 dB at 20000 Hz) 20 20000 Hz Class-D Speaker Amplifier Outputs Full Scale Output Voltage (into 4 Ω) 2.83 2.90 3 Vrms Dynamic Range (measured with -60 dBFS signal present) 92 dBFS Total Harmonic Distortion + Noise (THD + N, measured at -3 dBFS) -70 dBFS Analog Frequency Response (+/- 3 dB at 20 Hz, +/- 1 dB at 20000 Hz) 20 Efficiency (Measured at 1 W/Ch) 20000 85 Hz % Line Inputs Full Scale Input Voltage 1.0 Vrms Dynamic Range (measured with -60 dBFS signal present) 89 dBFS Total Harmonic Distortion + Noise (THD + N), measured at -3 dBFS -87 dB Channel Crosstalk -84 Analog Frequency Response (+/- 3 dB at 200 Hz, +/- 1 dB at 20000 Hz) dBFS 200 20000 Hz Microphone Inputs Full Scale Input Voltage (With 20 dB boost) Full Scale Input Voltage (With boost off) 0.1 1.0 Dynamic Range (measured with -60 dBFS signal present) Vrms 89 dBFS Total Harmonic Distortion + Noise (THD + N), measured at - 3 dBFS -83.4 dBFS Channel Crosstalk (measured at 1 kHz, 0 dB gain) -84 dBFS Analog Frequency Response (+/- 3 dB at 200 Hz, +/- 1 dB at 20000 Hz) 200 20000 Hz Ordering Information Model/Order/Part Numbers Device Set Order Number Audio Codec Part Number Codec Revision Audio Codec Package Type CX20672-21Z CX20672 -21Z 40-QFN © 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-203096 Supported Functions Number of DACs/ADCs 4/6 Digital Mic 2