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ADAU1761 Sample rate and DAC output level

Question asked by 一张小强仔 on Apr 17, 2018
Latest reply on Apr 18, 2018 by DaveThib

I recently us ADAU1761 to convert I2S signal to analog. When I change codes`s sample rate, I found my dac`s output level was changed too. 

I use "0x4017" "0x40F8" "0x40EB" to chaneg the sample rate.

Following are some test result.

condition 1: 48kHz sample rate. I give  I2S signal -10dBFS@1kHz.I got:

condition 2: 24kHz sample rate. I give I2S signal -10dBFS@1kHz。I got:

condition 3: 8kHz sample rate. I give I2S signal -10dBFS@1kHz。I got:


I have no idea  why sample rate change`s dac output level.