Conexant Launches High-Definition Voice Capture IC

December 20, 2012

Toni_McConnel-December 20, 2012

The CX20810 from Conexant Systems Inc. is the company's new high-performance, high-definition voice capture IC targeted to voice interactive products, voice conferencing systems, Skype TV/STB webcam, and surveillance. The company states the CX20810 is the industry’s first high-performance audio analog to digital converter (ADC) with pre-amp, which maximizes the signal-to-noise ratio of a microphone’s input path with a constant, low gain across a long range (up to five meters).

The CX20810 has a significant dynamic range of 106dB and maximizes the signal quality to avoid saturation while maintaining the SNR from the microphone. When used in an acoustic echo cancellation (AEC) system, the CX20810 maintains the SNR of a low-level voice signal while avoiding echo saturation and therefore captures the full scale speech signal without the saturation caused by high echo feedback.


Conexant’s CX20810 features high resolution digital and analog gain control over a wide range – allowing for the selection of an optimum operating point for microphones with a wide range of sensitivity. A smooth gain ramping circuit enables the dynamic adjustment of microphone gain. The CX20810 supports a microphone array with up to four synchronized ADCs and programmable preamplifiers, each with a dedicated microphone bias supply to eliminate crosstalk.

Key features
  • First far-field audio input class microphone ADC
  • 106dB dynamic range full path
  • Internal bi-quad for noise filtering and mic array matching
  • Low power 5uA stand-by
  • 122dBV input referred noise
  • Optional 1 Watt @ 4ohm Class D amplifier/ Digital PWM output available on CX20811 and CX20813.

EVKs are currently available to qualified customers and partners for $199.00. Pricing starts at $0.90 each in 10K quantities.

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