INA191: Low-Side Sensing accuracy

Hey Kazuhiko,

1. TI does not have data for gain error (EG) for any range besides 0.1V to Vs-0.1V. I would note that customer should not try use measurements when VOUT < VZL (zero-current output voltage). The output could be saturated if VOUT < VZL and thus not even linear.

2. TI does not have EG aging variation data. Although, we do provide reports of industry standard quality testing which involve storing at high temperature and checking parametrics. The reports can be found here: 

3. Most of our devices can be used low-side as long as VCM can operate at 0V. You can search for VCM range, package size, offset, and gain error using the parametric search tool: http://www.ti.com/amplifier-circuit/current-sense/analog-output/products.html#p3278=Analog%20Output;Analog%20Output%20w/%20Integrated%20Comparator;Analog%20Output%20w/Integrated%20Comparator;Analog%20Output%20w/Integrated%20Shunt%20Resistor;Analog%20output&p726min=-22;1&sort=p1170;asc

The INA191 is currently the smallest device with the lowest offset. One interesting alternative is the INA185. It is also very small and has a max 55uV offset at 0-V common-mode with better BW and slew rate.

Hope this helps.

Best,

Peter