PurePath pwm input from fpga

Patrick Isele

Other Parts Discussed in Thread: TAS5631, TAS5630B, TAS5630

I'm building active Speakers and would like to use the TAS5631.

There are 3 speakers (low, mid, high) and i have 3 spdif inputs. One for each line from a digital crossover.

So, i just need to convert the spdif to a pwm and for this, the TI's PWM processors are way overkill.

I thought i can take an fpga where i could implement an spdif to i2s and then a 2th order delta sigma DA stage where i have a pwm output.

i couldn't find detailed information about the pwm input specs of the PurePath Power Stages. Are they usable with delta sigma pwm outputs?

Greets from switzerland :)

over 12 years ago

0 Don Dapkus over 12 years ago

TI__Guru**** 189401 points

Hi, Patrick,

Have you considered a TAS5630B analog-input device?

Our modulators run at 384 kHz. If your sigma-delta output is a similar freq, it should work.

-d2

0 Patrick Isele over 12 years ago in reply to Don Dapkus

Prodigy 110 points

Thank you Don.

The TAS5630 is an option but the whole way is digital and then an analog stage at the end is a little bit uncool.

The 384 kHz are no problem. I will go this way.

0 Don Dapkus over 12 years ago in reply to Patrick Isele

TI__Guru**** 189401 points

Patrick,

You are welcome!

Analog is AWESOME, that's why it starts with an "A"

Digital is diabolical, that's why it starts with a "D"!!!

-d2

0 Patrick Isele over 12 years ago in reply to Don Dapkus

Prodigy 110 points

Hi again

Now, i got my Hardware with 2 TAS5631 and the cyclone2 FPGA. It works so far with a fix 384Khz pwm, but i'm not sure if the pwm signal realy should be a sigma delta stream. because as soon as the sigma delta modulator in the fpga is runing, the pwm frequency is no longer 384Khz (sigma delta modulation dosn't work with a fix pwm).

I use the device in 2xBTL (BD) Mode. Can you support me with a bit more details of the requested pwm input signals?

Thanks

Patrick

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PurePath pwm input from fpga