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PCM3168A AD overflow problem

Other Parts Discussed in Thread: PCM3168A, PCM3168

When the voltage applied to PCM3168A input is greater than the Full-scale input voltage. PCM3168A set OVF pin high,meanwhile the amplitude of the digital output data of the A/D Reduced about half than orginal(like AGC) , For a well the digital output data become to Orginal . Because the digital amplitude change suddenly ,there is a Apparent noise.
How can I make PCM3168 do not reduce digital amplied when the OVF situation occurs ? Is thera a register?