SLAS666B January 2010 – October 2018 TLV320DAC3101
PRODUCTION DATA.
DRC hysteresis is programmable by writing to page 0 / register 68, bits D1–D0. These bits can be programmed to represent values between 0 dB and 3 dB in steps of 1dB. DRC hysteresis provides a programmable window around the programmed DRC threshold that must be exceeded for the disabled DRC to become enabled, or the enabled DRC to become disabled. For example, if the DRC threshold is set to –12 dBFS and the DRC hysteresis is set to 3 dB, then if the gain compression in the DRC is inactive, the output of the DAC digital volume control must exceed –9 dBFS before gain compression due to the DRC is activated. Similarly, when the gain compression in the DRC is active, the output of the DAC digital volume control must fall below –15 dBFS for gain compression in the DRC to be deactivated. The DRC hysteresis feature prevents the rapid activation and de-activation of gain compression in the DRC in cases when the output of the DAC digital volume control rapidly fluctuates in a narrow region around the programmed DRC threshold. By programming the DRC hysteresis as 0 dB, the hysteresis action is disabled.
The recommended value of DRC hysteresis is 3 dB.