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Stereo AGC functionality for TLV320AIC3254

Posted: 26 Jan 2011     Print Version  Bookmark and Share

Keywords:TLV320AIC3254  audio codec  automatic gain control 

This report describes how to configure the TLV320AIC3254 (or AIC3254) very low-power stereo audio codec for stereo automatic gain control (AGC) operation.

AGC can be used to maintain a nominally-constant output level while recording. All the ADC processing blocks (also known as PRBs) support this AGC functionality. The AGC architecture supported in the PRBs provides independent control of the AGC function for the left and right channels. For example, if the target AGC gain is –12 dB, the left channel signal level is –14 dB, and the right channel signal level is –18 dB, the AGC will then bring both channel signals to –12 dB. The gain applied to the left channel would be +2 dB while the gain applied to the right channel is +6 dB.

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