INA210 maximum Vsense

Ivan,

The INA210 has a gain of 200, and the output is limited by the supply.  See page 7 of the data sheet.  Given that you can almost reach the rail of the supply on the output, you can back calculate the possible input.  With the largest supply allowed, 26V, you can see 26V/200 is 130mV.  That would be the largest Vsense input on the INA210.  There are other INA21x devices, INA211-INA215, which have gains as low as 50 and as high as 1000.  Lower gains have higher input potential, higher gains have lower input limits.  This is assuming uni-directional inputs.

If you want bi-directional, you'll have to scale your input down to have your output represent the Vsense*Gain appropriately while accommodating the reference voltage input.

If you have a 2.7V supply, the lowest the INA21x family allows, then you can only have a 13.5mV Vsense max in unidirectional operation.

Another thing to note is that you can have up to 26V on the Vsense, but it will rail the outputs.  The absolute maximum means it won't be damaged.

The Zero-Drift architecture means that the offset is very low and stable, and that means that you can get good, low-vsense results.   With a maximum Vsense of 10mV, the errors are still very low.  You can also measure down to almost 0V Vsense input.

if you would like to experiment with the INA21x family, there is an EVM available on the eStore at http://www.ti.com/tool/ina210-215evm for $149.

Best regards,

Jason Bridgmon