ZHCSGM5A August 2017 – November 2017 TLV320AIC3109-Q1
PRODUCTION DATA.
Often in audio applications, the dc offset needs to be removed from the converted audio data stream. The TLV320AIC3109-Q1 has a programmable first-order, high-pass filter that can be used for this purpose. The digital filter coefficients are in 16-bit format and therefore use two 8-bit registers for each of the three coefficients, N0, N1, and D1. Equation 3 shows the form of the digital high-pass filter transfer function:
Programming the channel is done by writing to registers 65–70, page 1. After the coefficients are loaded, these ADC high-pass filter coefficients can be selected by writing to bit 7 in register 107, page 0, and the high-pass filter can be enabled by writing to bit 7 in register 12, page 0.