ZHCSIV8B January 2010 – October 2018 TLV320DAC3101
PRODUCTION DATA.
DRC threshold represents the level of the DAC playback signal at which the gain compression becomes active. The output of the digital volume control in the DAC is compared with the set threshold. The threshold value is programmable by writing to page 0 / register 68, bits D4–D2. The threshold value can be adjusted between –3 dBFS and –24 dBFS in steps of 3 dB. Keeping the DRC threshold value too high may not leave enough time for the DRC block to detect peaking signals, and can cause excessive distortion at the outputs. Keeping the DRC threshold value too low can limit the perceived loudness of the output signal.
The recommended DRC threshold value is –24 dB.
When the output signal exceeds the set DRC threshold, the interrupt flag bits at page 0 / register 44, bits D3–D2 are updated. These flag bits are sticky in nature, and are reset only after they are read back by the user. The non-sticky versions of the interrupt flags are also available at page 0 / register 46, bits D3–D2.