CONEXANT CX20665

CX20665 HD Audio Codec with 2W Mono Class-D, Dual
Capless HP, Jack Retasking, SPDIF In and Out
Features
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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 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
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
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
Selectable 1.5 V/3.3 V link signaling
Available in 48-QFN package
Overview
Conexant's CX20665 is a low-power, 102 dB SNR HD Audio codec with integrated 2WRMS 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.
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.
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.
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.
Block Diagram
Software
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SmartAudio GUI
Voice Processing Algorithms include
end-to-end Noise Reduction, multiband 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
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Desktop PCs
Embedded Audio
Point Of Sale Systems
Part Number CX20665
Description High-Definition Audio
Codec
Analog Performance Characteristics
Parameter
Minimum
Typical
Maximum
Units
Line Outputs
Full Scale Output Voltage
Dynamic Range (measured with -60 dBFS signal present)
Total Harmonic Distortion + Noise (THD + N)
Channel Crosstalk
Analog Frequency Response (+/- 3 dB at 20 Hz, +/- 1 dB at 20000 Hz)
1.0
100
-85
-84
20
20000
Vrms
dBFS
dB
dBFS
Hz
20000
Vrms
dBFS
dB
dBFS
Hz
Headphone Output
Full Scale Output Voltage
Dynamic Range (measured with -60 dBFS signal present)
Total Harmonic Distortion + Noise (THD + N)
Channel Crosstalk
Analog Frequency Response (+/- 3 dB at 20 Hz, +/- 1 dB at 20000 Hz)
1.2
99
-87
-75
20
Class-D Speaker Amplifier Outputs
Full Scale Output Voltage (into 4 Ω)
3.96
2.83
Dynamic Range (measured with -60 dBFS signal present)
Total Harmonic Distortion + Noise (THD + N, measured at -3 dBFS)
Analog Frequency Response (+/- 3 dB at 20 Hz, +/- 1 dB at 20000 Hz)
Efficiency (Measured at 1 W/Ch)
4.0
2.90
94
-71
4.2
3
20
20000
85
Vp
Vrms
dBFS
dBFS
Hz
%
Microphone/Line Inputs
Full Scale Input Voltage (With 20 dB boost)
Full Scale Input Voltage (With boost off)
Dynamic Range (measured with -60 dBFS signal present)
Total Harmonic Distortion + Noise (THD + N)
Channel Crosstalk (measured at 1 kHz, 0 dB gain)
Analog Frequency Response (+/- 3 dB at 200 Hz, +/- 1 dB at 20000 Hz)
Input Resistance
0 dB
10-40 dB
Input Capacitance
0.1
1.0
Vrms
91
-87
-84
200
20000
15.8
5.0
5
dBFS
dBFS
dBFS
Hz
kΩ
pF
Ordering Information
Device
Order Number
CX20665-11Z
Model/Order/Part Numbers
Audio Codec
Revision
Part Number
CX20664
-11Z
Audio Codec
Package Type
Supported Functions
Integrated Mono
Number of
Class-D Amplifier
DACs/ADCs
48-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.
Y
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-203100
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Operating
Temperature
0 to 70 oC