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ADA4930-1 Input DC Adjustment from DAC

Dear Sir/Madam,

I am planning on using AD8336, ADA4930-1 and AD9681.

AD8336 to ADA4930-1 is DC coupled with unipolar signal that has DC offset.

The unipolar signal is connected to the non-inverting input of the ADA4930-1.

What options are available to adjust the unipolar signals DC offset so that it is within the

input common mode range of the ADA4930-1 (0V3 to 1V2) ?
The adjustment would need to be +- using
AD5516.


Regards Grant

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  • Hi,

    The idea is to be able to use the full ADC range for unipolar signals.

    I have included a diagram of what i am trying to achieve. The DC offset of 0.5V was chosen purely for discussion. The 0.5V source is for offset adjustment and would come from the AD5516 DAC.
    Thoughts, ideas potential problems welcome!

    Regards Grant

Reply
  • Hi,

    The idea is to be able to use the full ADC range for unipolar signals.

    I have included a diagram of what i am trying to achieve. The DC offset of 0.5V was chosen purely for discussion. The 0.5V source is for offset adjustment and would come from the AD5516 DAC.
    Thoughts, ideas potential problems welcome!

    Regards Grant

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