BU7291G-TR Datasheet, PDF (19/31 Pages) Rohm – CMOS Operational Amplifiers

BU7291G, BU7291SG, BU7294xx, BU7294Sxx
Datasheet
●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
VDD, VSS, EK, Vicm Unit:V
VF S1 S2 S3 VDD VSS EK Vicm Calculation
VF1 ON ON OFF 3
0 -1.5 3
1
VF2
ON ON ON 3
VF3
-0.5
0
1.5
2
-2.5
VF4
0
ON ON OFF 3
0 -1.5
3
VF5
3
VF6
2.4
ON ON OFF
0 -1.2 0
4
VF7
5.5
－ Calculation－
1. Input Offset Voltage (Vio)
|VF1|
Vio =
[V]
1+RF/RS
2. Large Signal Voltage Gain(Av)
Av = 20Log ^{2 × (1+RF/RS)} [dB]
|VF2-VF3|
3. Common-mode Rejection Ratio (CMRR)
CMRR= 20Log1.8 ^{× (1+RF/RS)} [dB]
|VF4 - VF5|
4. Power Supply Rejection Ratio (PSRR)
PSRR = 20Log ^{3.8 × (1+ RF/RS)} [dB]
|VF6 - VF7|
0.1µF
Vicm
SW1
RS=50Ω ^Ri=10kΩ
0.015µF 0.015µF
RS=50Ω ^Ri=10kΩ
50kΩ
SW2
VDD
DUT
RF=50kΩ
500kΩ
EK
Vo
500kΩ
SW3
RL
1000pF
VSS VRL
0.01µF
15V
NULL
VF
-15V
Figure 48. Test circuit 1 (one channel only)
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22.May.2013 Rev.001