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Audio codec claims to enhance automotive infotainment

14 Aug 2014  | Graham Prophet

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Dolphin Integration has announced an audio codec for automotive infotainment applications, the sCODS100-N.11-Xenon, which claims to provide optimal voice command and in-cabin phone conversation performances for high-end listening sound system. A tier-one automotive OEM has partnered with Dolphin Integration by approving the performance and configuration of this audio codec according to automotive application requirements and by purchasing the infotainment module with this audio IP embedded inside.

Alongside the automotive AEC-Q100 standard requiring high operating temperature range, the major automotive application concern is the noisy ground. In order to overcome this issue, sCODS100-N.11-Xenon embeds a common-mode noise-resilient preamplifier in the ADC path and provides a unique Common Mode Noise Tolerance Template (CMNT2) specifying the tolerated noise beyond audio bandwidth.

A second innovation is that an inter voltage-domain isolation-system enables independent start-up and power-down of analogue and logic power supplies of the codec, with control signal connected to SoC's activity control unit (ACU) for ensuring safe behaviour of the IP during power-on and power-off sequences.

The codec features two stereo ADCs with four stereo single-ended or differential inputs for line-in or mic-in application, and two stereo digital microphone inputs; three stereo DACs with three stereo singled-ended line outputs for 5.1 in-car sound system; automatic gain control (AGC) on the recording path preventing from saturation of audio signals; automatic Fs synchronisation system with an audio data adaptive synchroniser (ADAS) for both ADC and DAC; jerk-less solution ensuring the best resilience to Fs frequency shift on audio data path; PLL-less solution for eliminating jittered PLL with direct fixed main clock support; low noise regulator for highest resilience against power supply noise; and pop-up noise (PuN) reduction circuitry for line-out.

The codec is available at TSMC at 40nm, but can be retargeted from 90-28nm at both TSMC and SMIC.

- Graham Prophet
  EE Times Europe

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