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PCM4220 outputs wrong code under certain conditions

Other Parts Discussed in Thread: PCM4220

I have encountered the same problem published in this forum (this thread). We have to go in production with a board with this ADC but we cannot go further because the ADC became unstable and the PCM4220 decrease the gain randomly while working ... especially when the receive analog signal very rapidly.
Why no one employer of texas give an answer in this forum ?
Can someone of texas confirm that this problem is only in old production batch ?