INA821 datasheet(25/50 Pages) TI2

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INA821

www.ti.com

SBOS893D – AUGUST 2018 – REVISED JUNE 2020

Product Folder Links: INA821

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Table 4. System Specifications for Error Calculation

QUANTITY

VALUE

UNIT

VOUT

VCM

RS+

1000

RS–

999

RG tolerance

0.01

RG drift

ppm/°C

Temperature range upper limit

105

°C

Table 5. Error Calculation

ERROR SOURCE

ERROR CALCULATION

INA821 VALUES

SPECIFICATION

UNIT

G = 1

ERROR

(ppm)

G = 100

ERROR

(ppm)

G = 1000

ERROR

(ppm)

ABSOLUTE ACCURACY AT 25°C

Input offset voltage

VOSI / VDIFF

µV

350

3500

Output offset voltage

VOSO / (G × VDIFF)

300

µV

350

Input offset current

IOS × maximum (RS+, RS–) / VDIFF

0.5

CMRR (min)

VCM / (10

CMRR/20 × V

DIFF)

92 (G = 1),

112 (G = 10),

132 (G = 100)

251

PSRR (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 (max)

GTC × (TA – 25)

5 (G = 1),

35 (G = 10, 100)

ppm/°C

400

2800

Gain drift from external resistor RG (max)

GTC × (TA – 25)

ppm/°C

800

Input offset voltage drift (max)

(VOSI_TC / VDIFF) × (TA – 25)

0.4

µV/°C

320

3200

Output offset voltage drift

[VOSO_TC / ( G × VDIFF)] × (TA – 25)

µV/°C

400

Offset current drift

IOS_TC × maximum (RS+, RS–) ×

(TA – 25) / VDIFF

pA/°C

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

10 (G = 1, 10),

15 (G = 100)

ppm of FS

Voltage noise (at 1 kHz)

eNI = 7,

eNO = 65

µVPP

1335

886

3566

Current noise (at 1kHz)

IN × maximum (RS+, RS–) × √BW /

VDIFF

0.13

pA/

√Hz

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

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