I'm looking for an ADC to sample an audio input and have a few questions.
First off, I have purchased a LTC1864, it will be used to sample line level audio (2 channel) but I'm not sure if the ADC I purchased will actually work with two channels. This is the ebay listing that I bought it off:
And this is the datasheet:
The datasheet specifies that the LTC1864 MSOP8 has two inputs, an in+ and in- which leads me to believe that this particular device is a differential converter. Meaning the output will be the difference between the two inputs. But there is an analogue reference pin... which confuses me further.
But the ebay listing says "LTC1864CMS8 ~ LTC1864 Î¼Power, 16-Bit, 250ksps 1- and 2-Channel ADCs in MSOP IC"
Is there some sort of tricky way to make a differential converter into a 2-channel converter? Or is the ebay add just incorrect?
Lastly, since I'm sampling line level audio, my input is going to go negative with respect to ground. What is the best way to sample a negative voltage, I was thinking of just adding a DC bias with a passive adder. I know the best way would be to add the bias with an active adder (op amp circuit) but unfortunately I have a single supply (+5v).