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ADAU1451 RMS Table Index_1 issue

Question asked by Sam.S on Jan 5, 2016
Latest reply on Jan 8, 2016 by Sam.S

Dear Sir,


Our customer found an issue on ADAU1451 SigmaDSP, the RMS table seem have problem.


When RMS Table choose index 1 (means -90dB), the output of RMS table is wrong and change repeated.

For example, please see attached .dspproj file, RMS table should output 5.96E-08 on format 8.24 (i.e. 0x00000001 on binary) when input = -90dB.

But as attached video show, it output wrong value (ex. 0xE4F4A25A on binary).


ADAU1451_RMS Table_Index1 issue.jpg


Note every other index (2~33) are all correct.

Sometimes after boot up , index 1 is correct. But wait a while, index 1 have problem again.


ADAU1451_RMS Table_Index n Value.jpg


Could you confirm if it is a bug. If yes, how could our customer workaround it?