PCM5100A abnormal output

Xiaowei Bai1

Other Parts Discussed in Thread: PCM5100A

Hello Team,

My customer used PCM5100A in the automotive cluster, during debug we found the PCM5100A abnormal out the pulse as figure 1, I check the power and I2S input don't find the abnormity. Do you have the suggestion for it? thanks..

Figure 1

Also I modify the C379 and C380 to 4.7uF no improvement this issue. Thansk...

over 7 years ago

0 Pavel Ruzicka over 7 years ago

Expert 1720 points

Hi,
are you sure, that this impulse is not present in the I2S data? It looks like normal reaction on data when you test dirac pulse, when you have zero for a long time and maximal level for one data sample.

0 Xiaowei Bai1 over 7 years ago in reply to Pavel Ruzicka

TI__Intellectual 1205 points

Hi Pavel,
Sure, we checked the data is right and we don't find the max data or long zero before this plus 3 to 5 byte.
So, the DAC ouput delay how many bytes with I2S input data? thanks...

0 Xiaowei Bai1 over 7 years ago in reply to Xiaowei Bai1

TI__Intellectual 1205 points

Hi,
Thanks, I have found the root reason.

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PCM5100A abnormal output