INA159 datasheet(25/51 Pages) TI2

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INA826

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SBOS562G – AUGUST 2011 – REVISED JUNE 2020

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The INA826 offers excellent gain error over temperature for both G > 1 and G = 1 (no external gain resistor).

Table 2 summarizes the major error sources in common INA applications and compares the two cases of G = 1

(no external resistor) and G = 10 (5.49-kΩ external resistor). As can be seen in Table 2, although the static errors

(absolute accuracy errors) in G = 1 are almost twice as great as compared to G = 10, there are much fewer drift

errors because of the much lower gain error drift. In most applications, these static errors can readily be removed

during calibration in production. All calculations refer the error to the input for easy comparison and system

evaluation.

Table 2. Error Calculations

ERROR SOURCE

ERROR CALCULATION

INA826

SPECIFICATION

G = 10 ERROR

(ppm)

G = 1 ERROR

(ppm)

ABSOLUTE ACCURACY AT 25°C

Input offset voltage (µV)

VOSI / VDIFF

150

Output offset voltage (µV)

VOSO / (G × VDIFF)

700

Input offset current (nA)

IOS × maximum (RS+, RS–) / VDIFF

CMRR (dB)

VCM / (10

CMRR/20 × V

DIFF)

104 (G = 10),

84 (G = 1)

631

Total absolute accuracy error (ppm)

333

1531

DRIFT TO 105°C

Gain drift (ppm/°C)

GTC × (TA – 25)

35 (G = 10),

1 (G = 1)

2800

Input offset voltage drift (µV/°C)

(VOSI_TC / VDIFF) × (TA – 25)

160

Output offset voltage drift (µV/°C)

[VOSO_TC / ( G × VDIFF)] × (TA – 25)

800

Offset current drift (pA/°C)

IOS_TC × maximum (RS+, RS–) ×

(TA – 25) / VDIFF

Total drift error (ppm)

3088

1088

RESOLUTION

Gain nonlinearity (ppm of FS)

Voltage noise (1 kHz)

eNI = 18,

eNO = 110

Total resolution error (ppm)

TOTAL ERROR

Total error

Total error = sum of all error sources

3436

2634

8.4 Device Functional Modes

The INA826 has a single functional mode and is operational when the power-supply voltage is greater than 3 V

(±1.5 V). The maximum power-supply voltage for the INA826 is 36 V (±18 V).

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