BU5281G Datasheet, PDF (12/22 Pages) Rohm – Low Input Offset Voltage Ground Sense CMOS Operational Amplifiers

BU5281G BU5281SG
Application Information
NULL method condition for Test circuit1
Parameter
Input Offset Voltage
Large Signal Voltage Gain
Common-mode Rejection Ratio
(Input Common-mode Voltage Range)
Power Supply Rejection Ratio
- Calculation -
1. Input Offset Voltage (VIO)
2. Large Signal Voltage Gain (AV)
3. Common-mode Rejection Ration (CMRR)
4. Power supply rejection ratio (PSRR)
Datasheet
VDD, VSS, EK, VICM Unit:V
VF SW1 SW2 SW3 VDD VSS EK VICM Calculation
VF1 ON ON OFF 3
0 -1.5 1.5
1
VF2
-0.5
ON ON ON 3
0
0.9
2
VF3
-2.5
VF4
0
ON ON OFF 3
0 -1.5
3
VF5
1.8
VF6
1.8 0 -0.9 0
ON ON OFF
4
VF7
5.5 0 -0.9 0
VIO =
|VF1|
1 + RF/RS
[V]
Av = 20Log ^{∆EK × (1+RF/RS) [dB]}
|VF3 - VF2|
CMRR = 20Log ^{∆VICM × (1+RF/RS)}
[dB]
|VF5 - VF4|
∆VDD × (1+ RF/RS)
PSRR = 20Log
[dB]
|VF7 - VF6|
0.1µF
SW1
VDD
RF=50kΩ
500kΩ
RS=50Ω
RI=1MΩ
0.015µF _0.015µF
DUT
EK
Vo
500kΩ
VICM
RS=50Ω
RI=1MΩ
SW3
RL
1000pF
50kΩ
SW2
VRL
VSS
0.01µF
15V
NULL
-15V
V V_F
Figure 25. Test circuit 1
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