A tier-one automotive Original Equipment Manufacturer (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. Further information on the common-mode management technique, is available in a technical article published by Dolphin Integration.
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
Pop-up Noise (PuN) reduction circuitry for line-out
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)