TAS5624ADDVEVM: TAS5624 EVM audible noise at 45Hz

MOTOW,

May you check the noise is from TAS5624 stage, or comes from modulator stage?

Dylan

is from TAS5624

MOTOW,

Please provide below information:

1. capture the  FFT plot of TAS5624 input.

2. check power supply waveform.

2. If item 1 doesn't show noise floor increment, then please check your schematic and layout according to TI EVM.  Or if you can provide the schematic and layout, so we can check that and provide you improvement.

Dylan

hi, the problem is we found this noise on the EVM

Hi MOTOW

    We will look into it and reply to you soon.

Hi,

the noise disappear after adding an AD capacitor but im not sure why?

MOTOW,

Great to hear the good news you solved. If you are willing to deep dive into the root cause, you can put here more details of schematic or captured waveforms, then we can continue debug. 

Dylan