TLV320AIC3107: TLV320AIC3107

Hi,

Are you talking about the input high pass filter? It is given by the equations below:

Fc = 1/(2*π*Req*Cc)
Cc = 1/(2*π*Req*Fc)

For high fidelity audio recording application it is desirable to keep the cutoff frequency of the high pass filter as low as possible. For single-ended input mode, the equivalent input resistance Req can be calculated as:

Req = Rin* (1 + 2g)/(1+g)

The variable g is the analog PGA gain calculated in linear terms:

g = 10000 * 2^floor(G/6)/Rin

where G is the programmed analog PGA gain programmed (in dB) and Rin is the value of the programmed input resistor
and assumes Rin = Rcm.

Best regards,
Jeff McPherson