TAS5631 PWM input

Laurentiu Chitu

Prodigy 75 points

Other Parts Discussed in Thread: TAS5631, TAS5518, TAS5508, TAS5086, TAS5630, TPA2016D2, TPA2008D2

Hello!

I have one TAS5631 and i don't want to drive with digital audio processor (TAS5518).

I want to use this power circuit in stereo mode.

Exist a good schematics (not processor) for convert analog audio signal to pwm signal for this TAS5631?

Many thanks .

over 14 years ago

0 Kim Nordtorp Madsen over 14 years ago

TI__Expert 4320 points

Hi Laurentiu Chitu

The TAS5631 was designed to be used with PWM modulators like the TAS5508/TAS5518/TAS5086.

If you just need analog input you should use the TAS5630. The TAS5630 is avaiable in TI's sample program.

If you insist on using the TAS5631 you already have you could use a TPA2016D2 as analog modulator, but you will not get the performance of the TAS5630

rgds,

Kim N Madsen

0 Laurentiu Chitu over 14 years ago in reply to Kim Nordtorp Madsen

Prodigy 75 points

Many thanks for this reply !

Best regards

Laurentiu Chitu

0 Laurentiu Chitu over 14 years ago in reply to Laurentiu Chitu

Prodigy 75 points

If I use tpa2008 as analog modulator is ok ?

Have a good Signal-to-noise ratio (96db).

Is necessary to connect output load to tpa2008 in this case?

Or I connect directly to entry (tas5631).

rgds

Chitu Laurentiu

0 Don Dapkus over 14 years ago in reply to Laurentiu Chitu

TI__Guru**** 189399 points

Hi, Chitu,

TPA2008D2 will work as a modulator, just connect the two outputs to the two inputs on the TAS5631. Just make sure you run the TPA2008D2 at 4.2V or less, or you'll damage the input pins on the TAS5631. I'd recommend 3.3V.

And, you're right, you should add some nominal load to the TPA2008D2 output. Something like a 1 kohm resistor across its outputs should be fine.

I'd just liked to reiterate what Kim said -- if you want analog input, by far the best way to achieve that is to use TAS5630!

-d2

0 Laurentiu Chitu over 14 years ago in reply to Don Dapkus

Prodigy 75 points

Hi Don!

Yes I know about TAS 5630 (analog inputs) but I have already the TAS 5631 .

(sorry I have not said this before )

Many Thanks!

rgds

Laurentiu Chitu

0 Don Dapkus over 14 years ago in reply to Laurentiu Chitu

TI__Guru**** 189399 points

Hi, Chitu,

May I ask where you got the 5631? Do you have a part, or an EVM?

What is it you're trying to do? What is your application?

If you are uncomfortable stating this information on the forum, you may add me as a friend, and then we can take this discussion off the forum.

-d2

0 Laurentiu Chitu over 14 years ago in reply to Don Dapkus

Prodigy 75 points

Hi Don !

Is not a problem[:)]

We engineer a colleague (Bucharest) sent me 2 pieces for testing,not EVM (I think is samples )

I wanted to test them because I saw on forums only good words for new models of circuit (classD)

rgds

Laurentiu Chitu

0 Don Dapkus over 14 years ago in reply to Laurentiu Chitu

TI__Guru**** 189399 points

Hi, Chitu,

If you send me your address (privately), I can see if I can find a couple TAS5630s in the lab for you. It pains me to see people work on non-optimal solutions. I think you will never be able to achieve the same level of performance as the TAS5630.

-d2

0 Laurentiu Chitu over 14 years ago in reply to Don Dapkus

Prodigy 75 points

Don Dapkus said:

I think you will never be able to achieve the same level of performance as the TAS5630.

Hi!

Are of the same opinion!

I will send the adress!

Many thanks for all

Rgds

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TAS5631 PWM input