How to design an ADC driver for sensing +- 10V bipolar signals and drive AD7380?

Hi, we want to use AD7380 for motor control. However, the two channel signals are bipolar with +- 10V range. How could I design an ADC driver (for example, using ADA4940 or other chips) for AD7380 in this application? Is there any reference designs?

Thanks!

Parents
  • 0
    •  Analog Employees 
    on Oct 23, 2019 2:59 AM

    Hi,

       Apologies for late response on this. Here is a circuit for the +/-10V range that you can consider. The gain of the diff amp, ADA4940 should be G=0.33 and reference for the AD7380 is set at 3.3V and deriving VCM = 1.65V  from the reference. Any RF and RG combination you want as long as the gain is 0.33,

    Regards,

    Jonathan

Reply
  • 0
    •  Analog Employees 
    on Oct 23, 2019 2:59 AM

    Hi,

       Apologies for late response on this. Here is a circuit for the +/-10V range that you can consider. The gain of the diff amp, ADA4940 should be G=0.33 and reference for the AD7380 is set at 3.3V and deriving VCM = 1.65V  from the reference. Any RF and RG combination you want as long as the gain is 0.33,

    Regards,

    Jonathan

Children
No Data