Which VCA for Digital volume control

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I don't regards the CS3310 as digital. It takes an analog signal and does only analog "processing" on it. You signal is always in the analog design.

If you go with relays you make identicaly the same signal path, but instead of everything in an ic, it is in several components, and you replace the fet switches with relays. But it is the same basic circuit more or less.

If you want real industry standard components, then the relays are your best bet.

Next would be making a circuit with a "two quadrant multiplier". But this is going to be more difficult. And if you really want to do it, then you can even make the multiplier discrete. Take a look at the application notes of AD for those devices: http://www.analog.com/en/subCat/0,2879,773%5F862%5F0%5F%5F0%5F,00.html

Other idea, you could steer a led with your digital signal and couple this to a resistor in the feedback of an opamp. Simple and total separation between digital and analog.

Other possibility: http://www.national.com/pf/LM/LM13700.html
 
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