CX20672 Datasheet, PDF (1/2 Pages) Conexant Systems, Inc – Capless headphone eliminates BOM

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 2-
WRMS stereo Class-D using 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 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 DC-
level 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, multi-
band 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