We need to have the PCM2912A microphone level setting retained after it is unplugged/replugged. The Set-Up Guide (SBAU141, pg 26) for the demo board says:
"Microphone Volume Windows for Record Volume Setting (Windows XP) Set the microphone volume and the recording mute level from –12 dB to +30 dB, as shown in Figure 3-11. The initial volume setting upon installation is approximately +8 dB. After this process is complete, the system volume setting for each component is maintained even if EVM is plugged in/out."
This does not happen on our XP computer. Yet the same computer does permanently retain the microphone settings for other similar audio converters. Testing the PCM2912A, the setting almost always resets back to a default setting of about 7% of full scale. This PC has saved the setting a few times -- but most often goes back to the default.
However the PCM2912A settings are retained on a different PC with Win7. And another XP machine seems to retain the settings (but time will tell).
We are designing a device which will require an initial calibrated setting to be reliably retained.
Any suggestions or help concerning this would be greatly appreciated.
-Terence-