BU7241G_14 Datasheet, PDF (29/48 Pages) Rohm – CMOS Operational Amplifiers

BU7241G BU7241SG BU7242xxx BU7242Sxxx BU7244xx BU7244Sxx ^Datasheet
Application Information
NULL method condition for Test Circuit 1
Parameter
VDD, VSS, EK, VICM Unit:V
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
- Calculation -
1. Input Offset Voltage (VIO)
VF1 ON ON OFF 3
0 -1.5 3
1
VF2 _{ON ON ON}
3
-0.5
0
1.5
2
VF3
-2.5
VF4 _{ON ON OFF}
3
0
0 -1.5
3
VF5
3
VF6
ON
1.8
ON OFF
0
-0.9 0
4
VF7
5.5
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
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
Figure 71. Test Circuit 1 (One Channel Only)
V V_F
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TSZ02201-0RAR0G200240-1-2
03.Dec.2014 Rev.003