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ADC input -1V to 1V can be configured to 0v to 2V input

Other Parts Discussed in Thread: ADS6142

Hi ,

In our application ,the input to ADC is 0V to 2V  pulses , instead of -1V to 1V. The ADC part which supports 2Vp-p can be used?. By using VCM pin of ADC, is it possible or we have to choose ADC which support input 4Vp-p. Pl suggest.

regards

Keshava Rajesh

  • Hi Keshava,

    Can you please provide a part number? If you can tell us which ADC are you using in your project, we'd be happy to assist you.
  • Dear Tom,

    Thank you for reply. We have used ADS6142 in our old design,this part was used for  -1V to 1V  input signal range. Now requirement is input signal range 0 to 2V . Now we can go to any other new part. My doubt is any ADC which supports 2Vp-p input range can be used for 0 to 2V input range application.

    regards

    Keshava Rajesh

  • Hey Keshava,

    Am i understanding you correctly? The input signal requirement for you application has changed from a -1V to 1V swing (2Vpp) to 0 to 2V swing, and you are wondering if the ADS6142 will still support this? Yes it should work. The differential voltage max of the device is 2Vpp and your new input range still satisfies this parameter as well as the dynamic range of the device.

    Yusuf
  • Dear Yusuf,

    Thank you for reply. Yes what you said is correct. Can you pl suggest input circuit of the ADC for getting input signal range 0 to 2V .

    regards

    Keshava Rajesh

  • Hey Keshava,

    You will need an amplifier for the input stage. Please post to high speed amplifier team for device and circuit recommendation.

    Yusuf
  • Hi yousuf,

    Thank you for reply. Is it  not possible with transformer ?

    regards

    Keshava Rajesh

  • Hey Keshava,

    The data sheet says 2Vpp is the recommended operating range but its actually the max Vpp. Therefore, have an amplifier in input stage to condition the signals amplitude before it reaches the ADC would be ideal.

    Yusuf