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Date: 14-08-14

Voice commands enhancing audio codec for automotive IVI

sCODS100-N.11-Xenon, a new audio codec from Dolphin Integration is designed exclusively for automotive infotainment applications supporting voice commands and noise free high quality in-cabin phone audio.

sCODS100-N.11-Xenon embeds 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.

Dolphin Integration said leading automotive electronic OEM supplier has approved the performance and configuration of sCODS100-N.11-Xenon audio CODEC as per automotive application requirements and by purchasing the infotainment module with this audio IP embedded inside.

Another interesting feature supported in this audio codec is an inter voltage-domain isolation-system enabling independent start-up and power-down of analog 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.

Other key features of this codec as per Dolphin include:

2 stereo ADCs with 4 stereo single-ended or differential inputs for line-in or mic-in application, and 2 stereo digital microphone inputs
3 stereo DACs with 3 stereo singled-ended line outputs for 5.1 in-car sound system
Automatic Gain control (AGC) on recording path preventing from saturation of audio signals
Automatic Fs synchronization system with Audio Data Adaptive Synchronizer (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
Pop-up Noise (PuN) reduction circuitry for line-out

Performance highlight:

For line/mic in to ADC path:
CMRR (@ a frequency from 20 to 20 kHz): 85 dB (minimum)
SNR (A-weighted): 90 dB (typical) / 85 dB (minimum)
THD+N (@ FS-1 dB): -80 dB (typical) / -75 dB (maximum)
PSRR (@ 1 kHz): 90 dB (typical)
For DAC to line-out (with 3 kOhm load minimum) path:
SNR (A-weighted): 100 dB (typical) / 96 dB (minimum)
THD+N (@ FS-1 dB): -90 dB (typical) / - 85 dB (maximum)
PuN: - 60 dBVp (typical)
PSRR (@ 1 kHz): 90 dB (typical)

Availability:

At TSMC 40 nm, but easily retargetable from 90 nm to 28 nm at both TSMC and SMIC

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