PCM1704 +20V power supply issue

user6322036

Hi, Is it possible to damage bit clock circuit/Data Latch Enable Input through pin2&7 by feeding high voltage through back when PCM1704 power supply is up to +20V by regulator issue?

over 5 years ago

0 Paul_Frost over 5 years ago

TI__Guru 53773 points

Hi, and welcome to the e2e forums.

It is definitely possible that you damaged the device. We publish the Absolute Maximum Ratings for this reason. The device is rated for a maximum of 6.5V based on the device physics of the process that was used to produce it, and the discrete components that are represented on the silicon. Applying greater than the absolute maximum can result in electrical over-stress (EOS).

Thanks,

Paul

0 user6322036 over 5 years ago in reply to Paul_Frost

Prodigy 90 points

Hi Paul,

I know that this DAC should have been damaged. However, I concern that if the clocker connected to the DAC was also damaged by the +20V stress. Do you have any ideal about this?

Thanks

0 Paul_Frost over 5 years ago in reply to user6322036

TI__Guru 53773 points

Hi Su,

You would need to verify the abs. max values for the clock circuitry as well to see if you damaged it. I also recommend that you check all the pins to see if you have normal operation. You could also monitor the total current for each device to see if it is drawing too much.

Thanks,

Paul

0 user6322036 over 5 years ago in reply to Paul_Frost

Prodigy 90 points

Hi Paul,

Thanks. So it is possible that the 20V stress could feed back through PCM1704 to front-end clocker, right?

Regards,

0 Paul_Frost over 5 years ago in reply to user6322036

TI__Guru 53773 points

Hi Su,

That can depend on many factors, such as how the 20V stress was applied in the first place. I think you should verify the behavior of all pins for the clock circuit and the DAC, to see if there is erroneous behavior.

Thanks,

Paul