AD7984

Hello

I have 1 single analog input only, It is ok to connect IN- to GND?

Roi

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  • +1
    •  Analog Employees 
    on Aug 2, 2021 2:49 PM

    Hi Roi,

    Thanks for your query. Unfortunately the answer is no, the AD7984 requires the input common mode voltage of the IN+ and IN- pins be nominally VREF/2. For example, if VREF = 5V, then the common mode voltage must be 2.5V at all times for the ADC to be functional.

    I recommend looking at either the AD4002, AD4006 or AD7980 as a replacement for the AD7984 here. The AD4002/AD4006 are 18-bit, single-ended ADCs that you could connect the IN- input to GND. The AD7980 is also single-ended, but is only 16-bits. All of these ADCs are pin-compatible to the AD7984.

    Thanks,

    Tyler

Reply
  • +1
    •  Analog Employees 
    on Aug 2, 2021 2:49 PM

    Hi Roi,

    Thanks for your query. Unfortunately the answer is no, the AD7984 requires the input common mode voltage of the IN+ and IN- pins be nominally VREF/2. For example, if VREF = 5V, then the common mode voltage must be 2.5V at all times for the ADC to be functional.

    I recommend looking at either the AD4002, AD4006 or AD7980 as a replacement for the AD7984 here. The AD4002/AD4006 are 18-bit, single-ended ADCs that you could connect the IN- input to GND. The AD7980 is also single-ended, but is only 16-bits. All of these ADCs are pin-compatible to the AD7984.

    Thanks,

    Tyler

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