Hi.
there is not information about the input impedance of INA240 in the datasheet.
Can you provide information about it?
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Hi.
there is not information about the input impedance of INA240 in the datasheet.
Can you provide information about it?
Hi Shlomi,
the common mode input resistance is not constant but depnds on the common mode input voltage according to figures 7-14 and 7-15 of datasheet. The input resistance can be estimated by calculating the gardient of these curves:
R = dU_common_mode / dI_input_bias
which is about
R = (70 - 10)V / (200 - 80)µA = 500k
for common mode input voltages >10V.
Kai
Hello Shlomi,
As Kai mentioned, the common-mode input resistance at each input pin is variable depending upon what the VCM is and can be easily deduced using Figure 7-14 and 7-15.
There is also a typical 6kΩ (+/-20%) differential input resistance in between IN+ and IN- pins.
Sincerely,
Peter