Table 7-3. Total Error Calculation: Example 3 (1) (continued)

TERM

SYMBOL

EQUATION

MAX VALUE

External Gain Resistor

Error + Drift

ErrorG_R

Equation 4

0.707%

Total error

—

ErrorIOS2+ ErrorG_R2+ ErrorG+ErrorLin2 1.1%

(1)

The data for Total Error Example 3 is taken with the INA790x , VS = 5V, VCM = 12V, VREF = 0V, T = 125°C, External Gain = 4 (Total

Gain = 80mV/A), External Resistor Tolerance = 0.25%, External Resistor Drift = 25ppm/°C and ISENSE = 25A.

7.1.1.7 Total Error Curves

INA790A and INA790B Total Error Curve plots are generated using Total Error Examples for Adjustable Gain of

1 (unity gain).

Input Current (A)

0

5

10

15

20

25

30

35

40

45

50

0

1

2

3

4

5

TA = 125 C

TA = -40 C

TA = 25 C

VCM = 48V, VS = 5V, VREF = 2.5V, Adjustable Gain = 1

Figure 7-1. INA790A Total Error vs Input Current

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INA790A, INA790B

SBOSAA6B – MAY 2024 – REVISED JULY 2025

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