TAS5558: Integration with TAS5624A and output for graphic equaliser

Freddie Temperton29

Part Number: TAS5558
Other Parts Discussed in Thread: TAS5624A, TAS5624

So I have a design with the TAS5558 processor and TAS5624A Class-D output, however I would like a 3.3V amplitude audio signal to send to my DSP for a graphic equaliser.

My thoughts are to take the signal from two places: the PWM signal output from the TAS5558 and filter it, or resistor divider the diff output from the TAS5624A (I'm using it in BTL mode).

Do people have recommendation on which is preferred of better from a signal integrity standpoint?

Thanks for any suggestions!

over 8 years ago

0 Adam Sidelsky over 8 years ago

TI__Guru 65450 points

Freddie,

If you are only using one TAS5624 then you should have extra unused PWM outputs from your TAS5558. I would recommend using these instead of the TAS5624 outputs since you don't want to add extra circuitry there. Using the extra PWM outputs should have no effect on the rest of your circuit at all.

Regards,

-Adam

0 Freddie Temperton29 over 8 years ago in reply to Adam Sidelsky

Prodigy 100 points

Ah of course! Presumably you can mux your audio path to output to multiple PWM outputs simultaneously?

0 Adam Sidelsky over 8 years ago in reply to Freddie Temperton29

TI__Guru 65450 points

Yes you can!

Details are in the datasheet but please let me know if you need some assistance.

Regards,

-Adam

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TAS5558: Integration with TAS5624A and output for graphic equaliser