Tool/software:
Hello!
- We're configuring the TAS2563 with external PVDD and are testing how high we set the levels to drive our speaker with. The signal is good and strong at AMP_LEVEL at 17 dBV and DVC_PCM at 0 dB. The signal is still not saturated at levels higher than AMP_LEVEL 17.
At this level, the pilot tone continues playing without stopping after our signal stops and only stops when we shut down the DAI link* (or manually lower the gain). The behavior resembles a feedback loop.
However, if we lower either DVC or AMP_LEVEL slightly, the pilot tone turns off by itself after a short while. Is this how the pilot tone should behave?
The image shows only when adjusting DVC, but it looks similar when adjusting AMP_LEVEL instead.- The level of the pilot tone is around -30 dBFS in all cases I checked, which seems louder than the -40 dB specified in the datasheet (page 11 in https://www.ti.com/lit/ds/symlink/tas2563.pdf). We might be measuring the tone incorrectly or maybe the datasheet doesn't describe the default setting - can you explain what's expected?
- In another thread on this forum, the pilot tone is discussed and a TI representative describes that some settings are hidden and accessible only by TI. In this line, I'd like to request a lower pilot tone frequency since our target frequency response reaches 100 Hz, making the 60 Hz tone audible. What is the procedure to get this?
- Do you think using a lower frequency would prevent the feedback-like behavior from question 1, or should we consider a workaround with lower gain as shown in the image?
* Our system has a stream always setup, so the DAI link is usually running
