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Dear Guys,
Regarding datasheet, the gain should be 200 +/- 1.4%. I want to learn how to verify the gain. Did you have any suggestions on that? Thanks.Ian.
Hey Ian,
You can quickly verify the general gain of the part by applying a small voltage signal at the input pins (5mV) and measure the voltage from OUT to GND to make sure that the voltage is 200V/V * 5mV = 1V. This assumes you are connecting REF1 and REF2 to GND.
If you actually want to verify the 1.4% gain error, the you will want to emulate the test condition for this gain error spec (see below). Meaning you would apply whatever range of input voltages needed to get the OUT to swing from GND+0.5V to (V+)-0.5V. You would record the measuremens of Vin versus Vout-to-Vref and ensure slope (or gain error) is less than 1.4%.
Best,
Peter Iliya
Current Sensing Applications