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TLV320ADC3101: PGA noise floor

Part Number: TLV320ADC3101

Hello,

Our customer started TLV320ADC3101 evaluation to utilize it to new project.

They have same curiosity about noise floor of PGA frontend.

 

They have seen 12dB noise floor degradation at +20dB PGA gain by increasing input source impedance from 100ohms to 2.2Kohms as below red and blue plot. ADC3101 SNR is specified at short input condition only but is there any way to improve noise floor at realistic 2.2KR biased ECM input source application?