CX20672 HD Audio CODEC with 2W Class-D, Capless HP, Re-Tasking, and S/PDIF Out AudioSmart™ Product Brief CODEC with Integrated Class-D Stereo Amplifier for HD Audio Product Overview Key Features Conexant's CX20672 is a low-power, 102dB SNR HD audio CODEC with integrated 2-WRMS stereo class-D that uses spread spectrum dispersion technology to prevent EMI. Two independent pairs of DACs and three independent pairs of ADCs support multi-streaming and real time communications applications. The audio fidelity of the device exceeds Microsoft Premium Logo requirements. • A ProCoustic capless headphone driver delivers 31mW per channel into 32 loads, and eliminates external DC blocking capacitors. Two re-taskable ports are available to allow microphone/line in and microphone/line in/line out re-tasking. All output ports feature PopShield technology that eliminates pops and clicks. The CODEC features a stereo digital microphone interface that includes a hardware DC-level filter to remove DC offset and provides the clock output. One independent S/PDIF output is available that supports sample rates up to 96kHz, 16-bit to 24-bit resolution. Multiple GPIOs are provided, including speaker mute and EAPD functions. Integrated 5V to 3.3V and 3.3V to 1.8V 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. Applications • • • • Notebooks and ultrabooks All-in-one PCs POS systems Embedded audio Conexant Confidential • www.conexant.com • 035PBR00 • • • • • • • • • • • • • • • • • • • Two pairs of independent DACs, and three pairs of independent ADCs Sampling rates include 16-bit, 44.1kHz to 24-bit, 192kHz for DACs, and from 16-bit, 44.1kHz to 24-bit, and 96kHz for ADCs Integrated two WRMS (per channel) class-D stereo speaker amplifier Capless headphone eliminates BOM Two re-taskable ports Stereo digital microphone interface Integrated boost for all microphones One independent S/PDIF 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 four jacks Digital mixer Compliant with all Intel HD audio specifications Selectable 1.5V/3.3V link signaling Available in 40-QFN package System Block Diagram CX20672 HD Audio CODEC with 2W Class-D, Capless HP, Re-Tasking, and S/PDIF Out | AudioSmart™ Product Brief Analog Performance Characteristics Parameter Line Outputs Full Scale Output Voltage Dynamic Range (Measured with –60dBFS Signal Present) THD+n, Measured at –3dBFS Channel Crosstalk Analog Frequency Response (±3dB at 20Hz and ±1dB at 20000Hz) Headphone Output Full Scale Output Voltage Dynamic Range (Measured with –60dBFS Signal Present) THD+n, Measured at –3dBFS Channel Crosstalk Analog Frequency Response (±3dB at 20Hz and ±1dB at 20000Hz) Class-D Speaker Amplifier Outputs Full Scale Output Voltage (into 4) Dynamic Range (Measured with –60dBFS Signal Present) THD+n, Measured at –3dBFS Analog Frequency Response (±3dB at 20Hz and ±1dB at 20000Hz) Efficiency (Measured at 1/Ch) Line Inputs Full Scale Input Voltage Dynamic Range (Measured with –60dBFS Signal Present) THD+n, Measured at –3dBFS Channel Crosstalk Analog Frequency Response (±3dB at 200Hz and ±1dB at 20000Hz) Microphone Inputs Full Scale Input Voltage (with 20dB Boost) Full Scale Input Voltage (with Boost Off) Dynamic Range (Measured with –60dBFS Signal Present) THD+n, Measured at –3dBFS Channel Crosstalk (Measured at 1kHz and 0dB Gain) Analog Frequency Response (±3dB at 200Hz and ±1dB at 20000Hz) Minimum Typical Maximum Units 1 20 97 –90 –84 - –93 20000 Vrms dBFS dB dBFS Hz - 1 97 - Vrms dBFS 20 –85 –75 - 20000 dB dBFS Hz 2.83 20 - 2.90 92 –70 85 3 20000 - Vrms dBFS dBFS Hz % 1 200 89 –87 –84 - 20000 Vrms dBFS dB dBFS Hz 0.1 1 200 89 –83.4 –84 - 20000 Vrms dBFS dBFS dBFS Hz Ordering Information Device Set Order Number CX20672-21Z Model/Order/Part Numbers Audio CODEC Part Number CX20672 CODEC Revision Audio CODEC Package Type -21Z 40-QFN Supported Functions Number of DACs/ ADCs Digital Microphone 4/6 2 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. 035PBR00