ZHCSIV8B January 2010 – October 2018 TLV320DAC3101
PRODUCTION DATA.
When the output of the DAC digital volume control exceeds the programmed DRC threshold, the gain applied in the DAC digital volume control is progressively reduced to avoid the signal from saturating the channel. This process of reducing the applied gain is called attack. To avoid audible artifacts, the gain is reduced slowly with a rate equaling the attack rate, programmable via page 0 / register 70, bits D7–D4. Attack rates can be programmed from 4-dB gain change per sample period to 1.2207e–5-dB gain change per sample period.
Attack rates should be programmed such that before the output of the DAC digital volume control can clip, the input signal should be sufficiently attenuated. High attack rates can cause audible artifacts, and too-slow attack rates may not be able to prevent the input signal from clipping.
The recommended DRC attack rate value is 1.9531e–4 dB per sample period.