Hello,
it is not clear to me from studying the datasheet if the VREF pin on the PCM1808 can be used as an output, to externally bias the input signal.
I understand that the inputs are internally biased to VREF and that the preferred solution is to AC couple the signals to allow them to self centre.
However, in my application I would like to attenuate by 6dB with a voltage divider, which then needs to be referenced to VREF. It's a single supply design, so even if I put the voltage divider before an AC coupling capacitor I will still need to bias it to 2.5V / VREF.
So I'd like to know: how much current can VREF source/sink? What is its impedance? If I shouldn't use it for bias, can you recommend some other input attenuation method?