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TLV320ADC3120: I have a very high DC offset in "DC-coupled input"

Part Number: TLV320ADC3120


we like to measurement a DC signal and use the TLV320ADC3120 in the DC-coupled input (CH1_CFG0 Register). We don't have a capacitor in the signal line.

We have a 10% DC offset in the measuring Range.

The configuration:

- Line Input with a differential Amplifier stage.

- LJ (TX_Offset = 0);

- 2 Channel with 2.82Vpp input common-mode

- AVDD 3.3V

- No channel gain

I hope you can help me.

Thanks, Anastasios