AnsweredAssumed Answered

ADAU1761 can't work

Question asked by Titan on Dec 9, 2015
Latest reply on Dec 17, 2015 by Titan

Dear Support Team,


I have build a board with ADAU1761, but seem it can't work well, there is no any audio output on all of output pins includes pin17,18,19,20,21, I used the same project file which can work well on EVB as attached.

1. Link compile and download, the result display is successful as attached picture;

2. pls refer to the attached my schematic, I can find the input audio signal probe on R18 using oscilloscope but can't find the output signal probe on C20.

3. I try to measurement the MICBIAS voltage, after I enable it and re-download, I measurement the voltage is still 0V on TP5.

I have debugged it two days but I can't find any fail cause, it is urgency and I really need you help. I guess maybe the DSP don't work on. what do you think? Do you have any suggestion to check if the DSP is work well?  I have checked the power supply and ripple, GND, and MCLK all are OK. what else I need to check?