BU7481G-TR Datasheet, PDF (11/22 Pages) Rohm – High Speed Low Voltage Operation CMOS Operational Amplifiers

BU7481G BU7481SG
Application Information
NULL method condition for Test Circuit 1
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 (V_IO)
2. Large Signal Voltage Gain (A_V)
3. Common-mode Rejection Ration (CMRR)
4. Power Supply Rejection Ratio (PSRR)
Datasheet
VDD, VSS, E_K, V_ICM Unit: V
V_F SW1 SW2 SW3 VDD VSS E_K V_ICM Calculation
V_F1 ON ON OFF 3
0 -1.5 1.8
1
V_F2
-0.5
ON ON ON 3
0
0.9
2
V_F3
-2.5
V_F4
0
ON ON OFF 3
0 -1.5
3
V_F5
1.8
V_F6 ON ON OFF 1.8
0 -0.9 0
4
V_F7 ON ON OFF 5.5
V_IO =
|V_F1|
1 + R_F/R_S
[V]
Av = 20Log ^{EK × (1+RF/RS) [dB]}
|V_F3 - V_F2|
CMRR = 20Log ^{VICM × (1+RF/RS)}
[dB]
|V_F5 - V_F4|
VDD × (1+ R_F/R_S)
PSRR = 20Log
[dB]
|V_F7 - V_F6|
0.1μF
SW1
VDD
R_F=50kΩ
500kΩ
R_S=50Ω
R_I=1MΩ
0.015μF _0.015μF
DUT
E_K
Vo
500kΩ
V_ICM
R_S=50Ω
R_I=1MΩ
SW3
R_L
1000pF
50kΩ
SW2
V_RL
VSS
0.01μF
15V
NULL
-15V
V VF
Figure 24. Test Circuit 1
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TSZ02201-0RAR0G200370-1-2
17.Jan.2014 Rev.001