ad5941 EIS impedance

Hi, I want to ask whether the gain factor should be calibrated when using ad5941 to measure impedance spectrum, just like ad5933

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  • 0
    •  Analog Employees 
    on Mar 21, 2021 2:09 PM

    Hi,

     In AD5940, ADC voltage channel is calibrated in production with PGA gain = 1.5 in Low mode mode, with the following endpoint errors:

    PGA Gain = 1 to 2 :

                                       min= -0.2%, Typical= +0.1%, Max= +0.3%

    PGA Gain = 2 to 4:

                                        min= -0.3%, Typical= +0.2%, Max= +0.8%

    PGA Gain = 4 to 9:

                                        min= -0.55%, Typical= +0.2%, Max= +0.55%

    Gain drift = -3uV/degC to 3uV/degC             (Refer to ADC ENDPOINT ERRORS in AD5940 datasheet)

    If this range is not acceptable for your design, ADC voltage channel must be calibrated for the corresponding gain and corresponding power mode.

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  • 0
    •  Analog Employees 
    on Mar 21, 2021 2:09 PM

    Hi,

     In AD5940, ADC voltage channel is calibrated in production with PGA gain = 1.5 in Low mode mode, with the following endpoint errors:

    PGA Gain = 1 to 2 :

                                       min= -0.2%, Typical= +0.1%, Max= +0.3%

    PGA Gain = 2 to 4:

                                        min= -0.3%, Typical= +0.2%, Max= +0.8%

    PGA Gain = 4 to 9:

                                        min= -0.55%, Typical= +0.2%, Max= +0.55%

    Gain drift = -3uV/degC to 3uV/degC             (Refer to ADC ENDPOINT ERRORS in AD5940 datasheet)

    If this range is not acceptable for your design, ADC voltage channel must be calibrated for the corresponding gain and corresponding power mode.

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