I have a question about the AD1939.
We connected the AD1939 to a microcontroller. Normally it's working all fine but sometimes (ca. 1 of out of 10 resets), we have a bitshift in our Audio data of always one bit. When reading back the registers in the error case all is good. We have the VCC_CODEC signal under microcontroller control, hence we're able to power the chip and we can also control the AD19396_RST pin to reset the analog part of the chip. But a lot of trial and error tests with various reset sequences and delays did not bring any improvement.
The error is happening when doing a power up reset of the whole board but also when doing resets over the watchdog.
Our design is derived from the AD1939 evaluation board but we changed two things: