ADC selection for single-ended source

Hi,

I'm looking for ADC of 14 bit, with two channels simultaneous sampling. Sampling rate has to be over 100 until saveral handreds of ksps, and input signals are single-ended and unipolar voltage from 0 to 3.3V.  However, I could only find ADC with differential input among ADI products. I know single-ended-to-differential conversion circuitry can be placed between signal source and ADC, however at the same time, another manufacturer is making single-end input ADC along with above requirements.

So question is, is there any merit to place single-ended-to-differential ADC driver before differential input ADC, compare to be using single-ended input ADC directly from signal source ?

Please presume single-ended input ADC is allowed to be input range of 0 to 3.3V, so no need to level shift, and also in case there is basically no need to amplify or attenuate the source signal.

Any of your instructions/suggestions are always very much appreciated.

Best Regards,

Parents
  • Hi Jonathan,

    Thank you very much for your reply and answers. I add a couple of questions and comment to your answers, as follows.

    A) ADC selection for 14bit

    a-1) AD7949 : As looking at functional block of the part, is it able to simultaneously sample data which is input to IN0 and IN1 ? If yes, how to do ?

    a-2) AD7485 : The part has single channel input. We need two(or more) channel input simultaneous sampling.

    B) I understand the merit you mentioned about differential input compare to single-ended.

    However in my case, signal source is single-ended and already be susceptible to noise. The noise which is captured in this stage can not be removed even if single-ended-to-differential conversion is placed afterward, can be ?  Even so, do you still think single-ended-to-differential conversion is effective and having a merit compare to directly connecting single-ended signal to ADC ?   

    Thank you very much for your kind helps again for my fundamental questions,

    Best Regards,

Reply
  • Hi Jonathan,

    Thank you very much for your reply and answers. I add a couple of questions and comment to your answers, as follows.

    A) ADC selection for 14bit

    a-1) AD7949 : As looking at functional block of the part, is it able to simultaneously sample data which is input to IN0 and IN1 ? If yes, how to do ?

    a-2) AD7485 : The part has single channel input. We need two(or more) channel input simultaneous sampling.

    B) I understand the merit you mentioned about differential input compare to single-ended.

    However in my case, signal source is single-ended and already be susceptible to noise. The noise which is captured in this stage can not be removed even if single-ended-to-differential conversion is placed afterward, can be ?  Even so, do you still think single-ended-to-differential conversion is effective and having a merit compare to directly connecting single-ended signal to ADC ?   

    Thank you very much for your kind helps again for my fundamental questions,

    Best Regards,

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