SLAAEH6 September 2024 TAA5212 , TAA5412-Q1 , TAC5111 , TAC5111-Q1 , TAC5112 , TAC5211 , TAC5212 , TAC5212-Q1 , TAC5311-Q1 , TAC5312-Q1 , TAC5411-Q1 , TAC5412-Q1 , TAD5112 , TAD5112-Q1 , TAD5212 , TAD5212-Q1
When cascading several biquad filters that add gain to the signal, make sure the overall response of the system does not cause the system to overflow. The biquad are computed in 32-bit fixed point arithmetic. If the overall response of the system in conjunction with the input signal is too large, undesired results can result due to arithmetic saturation. If saturation or overflow occurs, scale the input signal or scale down the coefficients of one or more biquad to keep the overall response of the system from saturating or overflowing.
Note that the overall response of the system is dependent on all the enabled components of the signal chain. The Digital High-Pass filter changes the frequency response at the low frequencies in conjunction with the Digital Biquad Filter response since both of these filters are cascaded together.