INA198: Full-Scale Input Voltage

Hello Kuramochi-san,

This typical spec for full-scale input voltage is not actually very useful. The 0.15V shown just gives the user an idea of the typical range of input voltage for these devices. For example, 10A of current through a 15mΩ shunt would result in 0.15V.

What is more useful is the max spec, which shows the max input voltage that can be applied before the device output goes into saturation. This is controlled by the swing to V+ power-supply rail spec, and dependent on both power supply voltage VS and gain of the device version.

For example:

If VS = 12V,

• INA193, INA196 - Vsense_max = (12 - 0.2) / 20 = 0.59 V
• INA194, INA197 - Vsense_max = (12 - 0.2) / 50 = 0.236 V
• INA195, INA198 - Vsense_max = (12 - 0.2) / 100 = 0.118 V

Best regards,

Ian Williams
Applications Manager
Current Sensing