What is the output voltage range for current sense amplifiers where I can achieve the best accuracy?
Users must be sure to look into the min and max output range of the current sensors being used. This value can be found in the specifications table under the heading Output Voltage Range.
For example, looking at the AD8210, the min and max spec is 0.05V to 4.9V respectively.
As the AD8210 has a gain of 20V/V the following can be deduced.
If we have 1mV differentia input, it means 20mV at the output. But, since the range of the output is specified at 50mV, we can assume that worst case we are unable to measure 1mV input differential accurately.
On the other hand, 3mV input multiplied by the gain of 20, means 60mV output which is above the min output range, and therefore we will achieve an accurate reading.
Same applies for the high end of the out range. That is, 250mV input multiplied by the gain of 20 means an output of 5V. But, the AD8210 output range is specified at a max of 4.9V, therefore our input to output reading will not be accurate.
Designing to within the output range range specifications ensures the highest accuracy for the current being monitored.
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