Using a Digital Input for an Additional Control Potentiometer

I'm using an ADAU1701 and I essentially need 5 AUX ADC controls (5 different control pots) I'm using the 4 AUX ADCs already, so I just need one more (I'm already using both audio ADC inputs) I assume this is simple enough by using one of the serial data inputs and using the output master clocks to clock the external ADC, but I'm not quite sure how to approach it. Does anyone have a suggestion of a specific ADC part number to use? Serial data confuses me somewhat so I never know what specifications I need. The more instructions you can give me, the better.

Thanks a lot.

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  • Actually in looking at the AD7910 a little more it seems like you can use CS essentually the same as the LRCLK since the date is triggered out on the edge of CS. All you would need to do is make sure the edges are going the right direction (which is easy enough to change in SigmaStudio) and then make sure the DSP understands that it's only looking at one channel, since the other one would be blank when the ADC is 'unselected' by the LRCLK. Does that seem right?

    Thanks again.

Reply
  • Actually in looking at the AD7910 a little more it seems like you can use CS essentually the same as the LRCLK since the date is triggered out on the edge of CS. All you would need to do is make sure the edges are going the right direction (which is easy enough to change in SigmaStudio) and then make sure the DSP understands that it's only looking at one channel, since the other one would be blank when the ADC is 'unselected' by the LRCLK. Does that seem right?

    Thanks again.

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