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Home » NEWEST Products » New by Category » Semiconductors » Audio ICs » Cirrus Logic CS6422 Full-Duplex Speakerphone IC
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Cirrus Logic CS6422 Full-Duplex Speakerphone IC

Cirrus Logic CS6422 Full-Duplex Speakerphone IC

Cirrus Logic's CS6422 Full-Duplex Speakerphone IC is an enhanced speakerphone IC that enables full-duplex conversation using echo cancellation and suppression in a single-chip solution. The CS6422 can easily replace existing half-duplex speakerphone ICs with a huge increase in conversation quality. The CS6422 consists of telephone & audio interfaces, two codecs and an echo-cancelling DSP. Most modern speakerphones use half-duplex operation, which alternates transmission between the far-end talker and the speakerphone user. This is done to ensure stability because the acoustic coupling between the speaker and microphone is much higher in speakerphones than in handsets where the coupling is mechanically suppressed.

  • Single-chip, full-duplex, hands-free operation
  • Optional Tx Noise Guard
  • Programmable attenuation during double-talk
  • Optional 34 dB microphone preamplifier
  • Dual channel AGC'ed volume controls with mute
  • Dual integrated 80 dB IDR codecs

  • Speech-trained Network and Acoustic Echo Cancellers
  • Rx and Tx supplementary echo suppression
  • Configurable half-duplex training mode
  • Powerdown mode
  • Microcontroller Interface

CDB6422 Evaluation Board

Cirrus Logic's CDB6422 Evaluation Board provides an easy platform to evaluate the performance of the CS6422 echo cancelling IC in a target system. To facilitate evaluation, the board provides a wide selection of network interfacing options (analog telephone line, μ-law/a-law PCM data, or analog RCA jack). The analog interfaces support both fixed and variable gain options to allow for level-matching with target hardware. The board includes a keypad and a DTMF generator to enable dialing on standard analog telephone systems. The board can operate from a single +12V power supply and can be used in a stand-alone configuration allowing for easy testing in car cellular hands-free applications.

  • Includes analog, digital (μ-law/a-law), and POTS (Plain Old Telephone Service) network interfaces
  • Variable gain (±20 dB) and user-defined fixed-gain options for analog acoustic and network inputs and outputs
  • Integrated DTMF generator and keypad provide dialing function
  • Operates from +5 V or +12 V power supply, allowing for use in car
  • Operates in stand-alone or PC-based configuration

  • On-board EEPROM stores CS6422 configuration settings
  • On-board speaker driver capable of driving 1 Watt into a 4 Ω load with less than 1% THD
Additional Resources


Block Diagram
Block Diagram
  • Cirrus Logic
  • Semiconductors|Integrated Circuits|IC-Audio