INA226: About Shunt voltage gain Error vs Temperature

Ozawa

Part Number: INA226

I have a question.

Please see INA 226 data sheet p.3 【Shunt voltage gain Error vs Temperature】.
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[DataSheet]: << www.tij.co.jp/.../ina226.pdf >>
Shunt voltage gain Error vs Temperature
TYP 10 [ppm / ° C.]
MAX 50 [ppm / ° C]
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In 【SHUNT INPUT GAIN ERROR vs TEMPERATURE】 on page 6, a negative slope is shown in the range of + 25 ° C or less around + 25 ° C, and a positive slope is shown in the range of + 25 ° C or more.

It seems to be contradictory compared to TYP: 10 [ppm / ℃] shown in the table on page 3, which is correct?

over 7 years ago

0 Peter Iliya over 7 years ago

TI__Mastermind 32395 points

Hello Ozawa,

The Shunt Voltage Gain Error vs. Temperature specs (Typical 10 ppm/C and Max 50 ppm/C) are absolute specifications over the range of -40C to to 125C. Thus, we are not specifying a direction of slope with these specification, only the typical and maximum absolute slopes you can expect in this temperature range.

The Shunt Input Gain Error vs. Temperature plot (Figure 6) in the datasheet is the usual gain error drift of the part, but will not apply to every single part. In order to design a robust system, you must assume that the gain error can drift in either direction (+-50ppm/C) at any temperature.

Hope this helps,

Peter Iliya
Current Sense Applications

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INA226: About Shunt voltage gain Error vs Temperature