BU7441G Datasheet, PDF (27/44 Pages) Rohm – Ground Sense Low Voltage Operation CMOS Operational Amplifiers

BU7441G BU7441SG BU7442xxx BU7442Sxxx BU7444F BU7444SF Datasheet
Application Information
NULL method condition for Test Circuit 1
VDD, VSS, EK, VICM Unit:V
Parameter
VF S1 S2 S3 VDD VSS EK VICM Calculation
Input Offset Voltage
Large Signal Voltage Gain
Common-mode Rejection Ratio
(Input Common-mode Voltage Range)
Power Supply Rejection Ratio
VF1 ON ON OFF 3
0 -1.5 1.8
1
VF2 _{ON ON ON}
3
-0.5
0
0.9
2
VF3
-2.5
VF4 _{ON ON OFF 3}
0
0 -1.5
3
VF5
1.8
VF6
ON
1.7
ON OFF
0 -0.9
0
4
VF7
5.5
－Calculation－
1. Input Offset Voltage (VIO)
VIO = ^|VF1|
[V]
1+RF/RS
2. Large Signal Voltage Gain (AV)
Av = 20Log ^{ΔEK × (1+RF/RS)} [dB]
|VF2-VF3|
3. Common-mode Rejection Ratio (CMRR)
CMRR= 20Log ^{ΔVICM × (1+RF/RS)}
[dB]
|VF4 - VF5|
4. Power Supply Rejection Ratio (PSRR)
PSRR = 20Log ^{ΔVDD × (1+ RF/RS)} _[dB]
|VF6 - VF7|
0.1µF
SW1
VDD
RF=50kΩ
500kΩ
EK
RS=50Ω
RI=1MΩ
Vo
500kΩ
0.015µF 0.015µF DUT
RS=50Ω
RI=1MΩ
VICM
50kΩ
SW2
VSS
SW3
RL
VRL
1000pF
0.01µF
15V
NULL
VF
-15V
Figure 71. Test Circuit 1 (One Channel Only)
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TSZ02201-0RAR1G200160-1-2
13.Feb.2015 Rev.002