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Unipolar input to Differential ADC

Question asked by lopez.zoni on Jun 27, 2018
Latest reply on Jun 27, 2018 by JinoL

Hi,

 

I have a linear image sensor application where the output signal from the sensor is a unipolar signal ranging from 0-3V. I want to convert this signal into a differential signal for ADC (1.8V such as LTC2188). The input signal can be considered as a DC signal since I am sampling the charge accumulated on a capacitor. 

 

The problem I have seen in using FDA such as ADA4932 was that the output signal clips due to the input range being high. I cannot put a series capacitor eliminate the DC since my signal is actually a DC.

 

Are there any recommendations about how to interface the sensor and the differential ADC?

 

Thx

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