ZHCSMU9A December 2020 – September 2021 TAS2764
PRODUCTION DATA
The TAS2764 contains a supply tracking limiter to control distortion and brownout prevention to mitigate brownout events. The gain reduction that occurs due to this block can be aligned across multiple devices using the Inter Chip Gain Alignment feature (Section 8.4.2.9) . The maximum device attenuation set by DEV_MAX_ATTN[6:0] register bits can be used to limit the combination of the limiter and brownout attenuation or the Inter Chip Gain Alignment.
The Supply Tracking Limiter (Section 8.4.2.8.1) and the BOP (Section 8.4.2.8.2) are configured independently. The Inter Chip Gain Alignment, if enabled, keeps multiple device gains in sync if the Supply Tracking Limiter and BOP need to reduce the gain. However, the BOP will take priority in the device. In order to prevent the Supply Tracking Limiter and BOP from both making simultaneous adjustments to the system, the Supply Tracking Limiter and Inter Chip Gain Alignment will be paused once the BOP engages until it is fully released .
By default, the limiter will attack the audio independent of BOP (bit LIM_PDB=0). If it is needed to pause the limiter attenuation when BOP is engaged, the bit LIM_PDB should be set to high.The attenuation applied to the device can be selected to be either the sum of the limiter attenuation (ICLA) and Brownout attenuation (ICBA) or the maximum of the two of them by setting the ICG_MODE register bit.