Product Brief

CX20632 5.1 HD Audio CODEC
AudioSmart™ Product Brief
2.8W Class-D, Dual Capless HP, Jack Re-Tasking,
and S/PDIF In and Out
Product Overview
Key Features
Conexant's CX20632 is a low-power, 102dB SNR HD
audio CODEC with an integrated mono 2.8WRMS
filterless class-D speaker amplifier using Spread
Spectrum dispersion technology to prevent EMI. Three
independent pairs of DACs and three independent pairs
of ADCs support multi-streaming and real-time
communications applications, and enable 5.1 multichannel audio. The audio fidelity of the device exceeds
Microsoft’s Premium Logo requirements.
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Two ProCoustic capless headphone drivers deliver
31mW per channel into 32W loads, and eliminate
external DC blocking capacitors. Built-in support for a
four-conductor type headset combo jacks saves space
and system BOM cost.
Multiple line outputs are available for driving external
powered speakers for 5.1 audio on three or five jacks, or
higher-powered integrated speaker amplifiers. Multiple
re-taskable ports are available, including microphone/
line-in, microphone/line-in/line-out, and line-in/line-out
re-tasking. All output ports feature PopShield
technology to eliminate pops and clicks.
The CODEC features a stereo digital microphone interface
that includes a hardware DC-level filter to remove the DC
offset, and provides the clock output. The CX20632 also
includes one S/PDIF output and one S/PDIF input, and
both support sample rates up to 192kHz, 16-bit to 24-bit
resolution. Multiple GPIOs are provided, including speaker
mute and EAPD functions. Hardware volume control
supports push button and rotary volume knobs.
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. Analog and digital
power rails can be dropped in S3/S4/S5 to maximize
power savings and EuP compliance.
Applications
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Desktop PCs
Multi-channel notebooks
All-in-one PCs
Embedded audio
Sound bars
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Three pairs of independent DACs, and three pairs
of independent ADCs
Sampling rates include:
– 16-bit, 44.1kHz to 24-bit, 192kHz for DACs
– 16-bit, 44.1kHz to 24-bit, 96kHz for ADCs
Integrated mono 2WRMS class-D amplifier
Two capless headphone ports eliminate BOM costs
Multiple line outputs for 5.1 audio
Hardware digital crossover for subwoofer
Multiple input/output re-taskable ports
Stereo digital microphone interface
Integrated boost for all microphones
Independent S/PDIF input and output
Integrated regulators maximize performance
Microphone 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 eight jacks
Digital mixer
Compliant with all Intel HD audio specifications
Selectable 1.5V/3.3V link signaling
Available in 48-QFN package
System Block Diagram
CX20632 5.1 HD Audio CODEC | AudioSmart™ Product Brief
Software
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SmartAudio GUI
Voice processing algorithms include end-to-end noise
reduction, AEC, and beam forming
10-band speaker EQ and DRC
3D expander
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Third-party software support includes Andrea,
Creative Labs, Dolby, Fortemedia, Waves MaxxAudio,
SRS, and DTS
Supports 32-bit/64-bit Windows/Linux
Analog Performance Characteristics
Parameter
Minimum
Typical
Maximum
Units
Line Outputs
Full-scale Output Voltage
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1
-
Vrms
Dynamic Range (Measured with –60dBFS Signal Present)
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100
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dBFS
THD+n
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–85
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dB
Channel Crosstalk
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–84
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dBFS
Analog Frequency Response (±3dB at 20Hz and ±1dB at 20000Hz)
20
-
20000
Hz
Headphone Output
Full-scale Output Voltage
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1.2
-
Vrms
Dynamic Range (Measured with –60dBFS Signal Present)
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99
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dBFS
THD+n
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–87
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dB
Channel Crosstalk
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–75
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dBFS
Analog Frequency Response (±3dB at 20Hz and ±1dB at 20000Hz)
20
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20000
Hz
Full Scale Output Voltage (into 4)
3.96
2.83
4
2.90
4.2
3
Vp
Vrms
dBFS
Class-D Speaker Amplifier Outputs
Dynamic Range (Measured with –60dBFS Signal Present)
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94
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THD+n (Measured at –3dBFS)
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–71
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dBFS
Analog Frequency Response (±3dB at 20Hz and ±1dB at 20000Hz)
20
-
20000
Hz
Efficiency (Measured at 1W/Ch)
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85
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%
Full-scale Input Voltage (with 20dB Boost)
Full-scale Input Voltage (with Boost Off)
0.1
1
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Vrms
dBFS
Microphone/Line Inputs
Dynamic Range (Measured with –60dBFS Signal Present)
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91
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THD+n
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–87
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dBFS
Channel Crosstalk (Measured at 1kHz and 0dB Gain)
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–84
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dBFS
Analog Frequency Response (±3dB at 20Hz and ±1dB at 20000Hz)
200
20000
Hz
Input Resistance
0dB
10dB to 40dB
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15.8
5
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k
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Input Capacitance
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5
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pF
Ordering Information
Supported Functions
Ordering
Part Number
Part
Number
Description
Package
Integrated Mono
Class-D Amplifier
Number of
DACs/ADCs
Digital Mic
CX20632-11Z
CX20632
0°C to 70°C 5.1 HD Audio CODEC
48-QFN
Y
6/6
Y
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Headquarters: 1901 Main Street, Suite 300 Irvine, CA,92614
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019-32PBR00