Hello,
We are using the TAS5717 in our design and we need to program the biquad filters. I have generated a set of coefficients in Matlab, but when I activate the biquad on the Amp, I only get a very high pitch noise, probably because the filter has gone unstable.
What is the format of the coefficients for the biquad (bq 0x27-0x2f, and 0x31-0x39). The documentation implies it is fix 3.23.
How do we handle negative numbers? Should we sign extend to 26 or 32 bit? Or should we negate the A coefficients and divide the middle ones by 2 (similar to other TI D/A converters)?
Thanks,
Pascal
Hi Pascal,
Sorry about the delay. Our Field App's Engineer Sal LaRussa who is supporting you, also just posted this question and we passed along the information to him.
I will go ahead and close this thread, but if you have any other question's, please feel to post it on E2E.
Best Regards,
Ravi Singh
Audio Applications Engineer
Best Regards,Ravi SinghAudio Applications Engineer