Manual

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
868
ON ON OFF OFF 5
820
Power supply voltage
rejection ratio
6 —
ON ON OFF OFF 6
18 —
Common-mode signal rejection ratio
(Common-mode input voltage)
VCC 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)