Hi TI audio folks
We have design a TAS5631 into our audio application, hardware manufactured and done. We had previous advice from the local UK TI support previously that we can skip having a TAS5518 as a PWM input to the TAS5631, part of the reason was PCB space constraint, but I think we have hit a big rock on this design as the PWM output from the TAS5518 does not look like a normal PWM but more of a Pulse Density Modulation (PDM), is this correct as the datasheet is quite vague on this. The issue we are facing now is how to generate an equivalent PWM signal of TAS5518 to be input to TAS5631.
On the TAS5631 EVM, the output of the TAS5518 looks like a PDM (Pulse Density Modulation) type of PWM? May you advise me if TAS5631 can simply take any PWM signal (as the TAS5631 video says it's a pin to pin compatible for PWM) or it must specifically take the format, PDM?, from the output PWM of TAS5518.
Our aim is to achieve generating the PWM input to the TAS5631 by a TI DSP timer and would need some advise on the format of the PWM urgently. Generating a PWM triangle signal and do a comparator with the audio signal within the TI DSP is easy, but the input of the TAS5631 doesn't seems to take a normal comparator PWM output?
I hope my questions are not confusing, thanks