External PLL loop filter on TAS5010 setup

Paul Koenig

Other Parts Discussed in Thread: TAS5342L

We are seeing an issue with our amplifier circuit . The amplifier seems to be shutting off for about 4mS at a time under some input conditions. I have traced this back to the TAS5010. It is setting the VALID_L and VALID_R lines to the amp (TAS5342L) low. The datasheet seems to suggest that the PLL inside the TAS5010 may be losing lock. It is in slave mode and is locking to the MCLK (12.288MHz) input clock.

What component values should be used in the external PLL loop filter for the TAS5010?

Thanks,

Paul

over 13 years ago

0 Don Dapkus over 13 years ago

TI__Guru**** 189399 points

Hi, Paul,

Let me look into this for you.

-d2

0 Paul Koenig over 13 years ago in reply to Don Dapkus

Prodigy 190 points

Hi Don,

My customer just informed us:

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I found an SLAA117A that has a schematic in the Appendix that shows 47pF, 680PF and 2.4K components in the PLL filter. I changed my values to these and the TAS5010 doesn’t seem to be deasserting the VALID lines any more so the amp isn’t cutting out.

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So, while they've used the other values in the past, they are going to test with these values for a while to see if the issue comes back.

Thanks,
Paul

0 Don Dapkus over 13 years ago in reply to Paul Koenig

TI__Guru**** 189399 points

Paul,

I found a newer document that references slightly different values:

http://focus.ti.com/lit/an/slea036a/slea036a.pdf

This shows 220R, 47 nF and 4.7 nF.

These are the values we used on an EVM.

-d2

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External PLL loop filter on TAS5010 setup