BA3131FS

Standard ICs

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!Measurement conditions

(Figure 1)

Measurement Item

EK

Equation

Input offset voltage

8

—

ON

ON

OFF OFF

1

Input offset current

8

—

OFF OFF OFF OFF

2

Input bias current

8

—

OFF

ON

OFF OFF

3

ON

OFF

High-amplitude voltage gain

8

5.5

ON

ON

ON

OFF

4

2.5

86

8

ON

ON

OFF OFF

5

82

0

Power supply voltage

rejection ratio

6

—

ON

ON

OFF OFF

6

18

—

Common-mode signal rejection ratio

(Common-mode input voltage)

VR

Vref

Vref

Vref

Vref

Vref

Vref

VF1

VF

VF2

VF3

VF4

VF5

VF6

VF7

VF8

VF9

VF10

S1

S2

S3

S4

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!Equations

(1) Input offset voltage (Vio)

Vio = | VF1 | / (1 + Rf / Rs)

(2) Input offset current (Iio)

Iio = | VF2 - VF1 | / (Ri (1 + Rf / Rs) )

(3) Input bias current (Ib)

Ib = | VF4 - VF3 | / (2 Ri (1 + Rf / Rs) )

(4) High-amplitude voltage gain (Avol)

Avol = 20log (3 (1 + Rf / Rs) / | VF6 - VF5 | ) (dB)

(5) In-phase signal rejection ratio (CMRR)

CMRR = 20log (4 (1 + Rf / Rs) / | VF8 - VF7 | ) (dB)

(6) (In-phase input voltage range) (PSRR)

PSRR = 20log (12 (1 + Rf / Rs) / | VF10 - VF9 | ) (dB)