When using the standard ToneGen from PurePath together with a TAS3204 device we found out, that the amplitude is going down over a period of time. It does not occur immediately. But when waiting e.g. 24 hours it can be measured. At the moment the only way to get rid of this problem is to reset the DSP. After that, the amplitude is OK but will also go down again over time.
In our product using the TAS3204 it is not acceptable to reset the DSP from time to time. Is there another solution?
This misbehavior can also be reproduced by using the TAS3204EVM eval board. For testing, the PurePath design can be just one ToneGen attached to one output. We are using an output frequency of 19kHz and an amplitude of 8000. The sample frequency is 4800Hz. Measurement is done by a scope at the BNC output. With the scope it can be seen that the frequency is stable but the amplitude is going down over time.