INA821 datasheet(24/36 Pages) TI1

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DIFF

INA821

SBOS893 – AUGUST 2018

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Table 3. Error Calculation

ERROR SOURCE

ERROR CALCULATION

INA821

SPECIFICATION

G = 1 ERROR

(ppm)

G = 100 ERROR

(ppm)

G = 1000

ERROR (ppm)

ABSOLUTE ACCURACY AT 25°C

Input offset voltage (µV)

VOSI / VDIFF

350

3500

Output offset voltage (µV)

VOSO / (G × VDIFF)

350

Input offset current (nA)

IOS × maximum (RS+, RS–) / VDIFF

0.5

CMRR (dB) (min)

VCM / (10

CMRR/20 × V

DIFF)

90 (G = 1),

110 (G = 10),

130 (G = 100)

316

PSRR (dB) (min)

(VCC -VS)/ (10

PSRR/20 × V

DIFF)

110 (G = 1),

114 (G = 10),

130 (G = 100)

Gain error from INA (%) (max)

GE(%) × 104

0.02 (G = 1),

0.15 (G = 10, 100)

200

1500

Gain error from external resistor RG (%)

(max)

GE(%) × 104

0.01

100

Total absolute accuracy error (ppm) at

25°C, worst case

sum of all errors

1005

2641

5848

Total absolute accuracy error (ppm) at

25°C, average

rms sum of all errors

523

1614

3839

DRIFT TO 105°C

Gain drift from INA (ppm/°C) (max)

GTC × (TA – 25)

5 (G = 1),

50 (G = 10, 100)

400

4000

Gain drift from external resistor RG

(ppm/°C) (max)

GTC × (TA – 25)

800

Input offset voltage drift (µV/°C) (max)

(VOSI_TC / VDIFF) × (TA – 25)

0.4

320

3200

Output offset voltage drift (µV/°C)

[VOSO_TC / ( G × VDIFF)] × (TA – 25)

400

Offset current drift (pA/°C)

IOS_TC × maximum (RS+, RS–) ×

(TA – 25) / VDIFF

160

Total drift error to 105°C (ppm), worst

case

sum of all errors

1634

5536

8560

Total drift error to 105°C (ppm), typical

rms sum of all errors

980

4111

5202

RESOLUTION

Gain nonlinearity (ppm of FS)

10 (G = 1, 10),

15 (G = 100)

Voltage noise (@1 kHz) (µVpp)

eNI = 7,

eNO = 65

871

720

3377

Current noise (@1kHz) (pA/

√Hz)

IN × maximum (RS+, RS–) × sqrt

(BW) / VDIFF

0.17

0.4

Total resolution error (ppm), worst case

sum of all errors

881

730

3392

Total resolution error (ppm), typical

rms sum of all errors

871

720

3377

TOTAL ERROR

Total error (ppm), worst case

sum of all errors

3519

8907

17800

Total error (ppm), typical

rms sum of all errors

1412

4475

7294

8.4 Device Functional Modes

The INA821 has a single functional mode and is operational when the power supply voltage is greater than 4.5 V

(±2.25 V). The maximum power-supply voltage for the INA821 is 36 V (±18 V).

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