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CCS/TLV320AIC23: Low-frequency input is attenuated

Part Number: TLV320AIC23

Tool/software: Code Composer Studio


I use TMS320C6713 with TLV320AIC23 to calculate wave input such as the joystick and display the result in the screen.

However, when I try to display the output of some low-frequency(under 100Hz) wave without TMS320C6713 doing any calculation, the amplitude is attenuated much.

Why does it happen?

I think that TLV320AIC23 has a function like a high-pass filter.

Please tell me anybody.