INA821 datasheet(27/41 Pages) TI1

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INA821

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SBOS893A – AUGUST 2018 – REVISED DECEMBER 2018

Product Folder Links: INA821

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Table 5. 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)

92 (G = 1),

112 (G = 10),

132 (G = 100)

251

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

940

2576

5738

Total absolute accuracy error (ppm) at

25°C, average

rms sum of all errors

487

1603

3834

DRIFT TO 105°C

Gain drift from INA (ppm/°C) (max)

GTC × (TA – 25)

5 (G = 1),

35 (G = 10, 100)

400

2800

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

4336

7360

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

rms sum of all errors

980

2957

4348

RESOLUTION

Gain nonlinearity (ppm of FS)

10 (G = 1, 10),

15 (G = 100)

Voltage noise (@1 kHz) (µVpp)

eNI = 7,

eNO = 65

1335

886

3566

Current noise (@1kHz) (pA/

√Hz)

IN × maximum (RS+, RS–) × sqrt

(BW) / VDIFF

0.13

0.4

Total resolution error (ppm), worst case

sum of all errors

1345

896

3581

Total resolution error (ppm), typical

rms sum of all errors

1335

886

3566

TOTAL ERROR

Total error (ppm), worst case

sum of all errors

3919

7808

16724

Total error (ppm), typical

rms sum of all errors

1726

3478

6806

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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