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INA821: Input Impedance

Takeshi Murase
Prodigy 20 points
Part Number: INA821

Tool/software:

Hi,

How is common mode respectively differential mode input impedance defined?
Is it possible to draw an equivalent schematic?

Also in the datasheet are the given values MIN, TYP or MAX?

Best regards,

/Takeshi

  • 0
    Guru 287800 points

    To simplify, common-mode impedance is a resistor (in parallel with a capacitor) between the input and ground; differential-mode impedance is between the two inputs. However, as shown in figures 16 and 29, a single impedance value does not completely describe the behaviour of the inputs.

    The values are in the TYP column.