- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Hi,
I want to connect a electret microphone, using the Scan_ADC component of the Analog CoProcessor.
I wonder where to connect the VAGND input signal of the Scan_ADC component when filtering on channel 0 is used? The VREF component seems to only support VDDA. Do I have to make an external connection to GND by a dedicated pin?
Regards,
Ralf
Solved! Go to Solution.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Hello Ralf,
You can use the pVref as the input to angd terminal of the ADC. As there is opamp buffer stage inside you can directly connect it. The connection I have specified was for the biasing of the signal with the same agnd.
Best Regards,
VSRS
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Hi,
You can use the pVref component, and use a high pass filter biased at pVref voltage and input side too. The connection to resistor end can be given through an Opamp buffer.
Best Regards,
VSRS
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Hi VSRS,
thank you for that tip. So, that means that there's (currently) no way to connect VAGND internally to the ADC?
Regards,
Ralf
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Hello Ralf,
You can use the pVref as the input to angd terminal of the ADC. As there is opamp buffer stage inside you can directly connect it. The connection I have specified was for the biasing of the signal with the same agnd.
Best Regards,
VSRS
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Hi VSRS,
okay, will try that. I just wondered why there's no direct (A)GND connection possible.
Thanks a lot for your help.
Regards,
Ralf