CX20665 HD Audio Codec with 2W Mono Class-D, Dual
Capless HP, Jack Retasking, SPDIF In and Out
Overview
Features
Conexant's CX20665 is a low-power, 102 dB SNR HD Audio codec with integrated 2-
WRMS filterless mono Class D speaker amplifier 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.
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.
The audio fidelity of the device exceeds Microsoft Premium Logo requirements. Two
ProCoustic capless headphone drivers deliver 31 mW per channel into 32 Ω loads and
eliminate external DC blocking capacitors. Built-in support for 4-conductor-type headset
combo jacks saves space and system BOM cost.
Integrated 2 WRMS mono Class-D
Two capless headphone ports
eliminate BOM
Multiple Line Outputs
Multiple input/output retaskable ports
Microphone to Headphone re-tasking
Hardware digital crossover for
subwoofer
Multiple stereo Line Outputs are available as well as multiple retaskable ports including
Microphone/Line in, Microphone/Line In/Line Out, and Line In/Line Out retasking.
Microphone/Line In/Headphone re-tasking is also supported. All output ports feature
PopShield technology that eliminates pops and clicks.
Integrated boost for all microphones
Independent SPDIF input and output
Integrated regulators maximize
performance
Record Security Control
Integrated headphone limiter (GS
Mark)
D-Flex Power Management minimizes
power consumption
Wake on PC BEEP
The codec includes one SPDIF output and one SPDIF Input both supporting sample
rates up to 192 kHz, 16-24-bit resolution. Multiple GPIO's are provided, including speaker
mute and EAPD functions. Hardware volume control support push button and rotary
volume knobs.
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. Analog and Digital power rails can be dropped in S3/S4/S5 to
maximize power savings and EuP compliance.
PopShield eliminates pops and clicks
Fidelity exceeds Microsoft WHCK
requirements
Jack sense detects up to 8 jacks
Digital Mixer
Compliant with all Intel High Definition
Audio Specifications
Block Diagram
Selectable 1.5 V/3.3 V link signaling
Available in 48-QFN package
Software
SmartAudio GUI
Voice Processing Algorithms include
end-to-end Noise Reduction, multi-
band AEC, and Beam Forming
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
Desktop PCs
Embedded Audio
Point Of Sale Systems
Part Number CX20665
Description High-Definition Audio
Codec
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