BU7265G_13 Datasheet, PDF (19/37 Pages) Rohm – Ultra Low Power CMOS Operational Amplifiers

BU7265G BU7265SG BU7266xxx BU7266Sxxx
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
- Calculation -
1. Input Offset Voltage (V_IO)
2. Large Signal Voltage Gain (A_V)
VDD, VSS, E_K, V_ICM Unit:V
V_F S1 S2 S3 VDD VSS E_K V_ICM Calculation
V_F1 ON ON OFF 3
0 -1.5 3
1
V_F2
-0.5
ON ON ON 3
0
1.5
2
V_F3
-2.5
V_F4
0
ON ON OFF 3
0 -1.5
3
V_F5
3
V_F6
1.8
ON ON OFF
0 -0.9 0
4
V_F7
5.5
V_IO = ^|VF1|
[V]
1+R_F/R_S
Av = 20Log
ΔE_K × (1+R_F/R_S)
[dB]
|V_F2-V_F3|
3. Common-mode Rejection Ratio (CMRR) CMRR= 20Log ^{ΔVICM × (1+RF/RS)} _[dB]
|V_F4 - V_F5|
4. Power Supply Rejection Ratio (PSRR)
PSRR = 20Log ^{ΔVDD × (1+ RF/RS)} _[dB]
|V_F6 - V_F7|
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
Figure 48. Test Circuit 1 (One Channel Only)
0.01μF
15V
NULL
-15V
V V_F
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111ï½¥15ï½¥001
19/33
TSZ02201-0RAR1G200270-1-2
12.Sep.2013 Rev.001