Bypass an Filter

Hello,

It's often useful to select or bypass filters for a A-B comparison. Here's a few ways:

If your hardware is connected to SigmaStudio via USBi, it's easy. You could click the ON-OFF button featured on most filters:

To bypass a string of filters all at once, place a Switch Mux in your schematic. Operate it by clicking on its buttons:

If your hardware is self-booting (not connected to SigmaStudio at runtime), use an Index-Selectable Mux controlled by a General-Purpose Input. Wire a physical switch (providing 3.3V or GND) to the ADAU1701's MP pin. The Buffer Gate shown converts the decimal (5.23) format "1.0" or "0" from the GP input to the integer (28.0) "1" or "0" that the Mux needs -- you could use instead a GPIO Conditioning block. See these Application Notes:

http://www.analog.com/media/en/technical-documentation/application-notes/AN-923.pdf

http://www.analog.com/media/en/technical-documentation/application-notes/AN-951.pdf

Best regards,

Bob

Dear Bob

Many thanks for your help. It works great !

Best Regards

Remo