bu7265g ROHM Co. Ltd., bu7265g Datasheet - Page 12

• Manufacturer Part Number: bu7265g
• Description: General-purpose Operational Amplifier / Comparator Series
• Manufacturer: ROHM Co. Ltd.

●Schematic Diagram
●Test circuit1 NULL method
BU7265G,BU7265SG,BU7271G,BU7271SG,
BU7411G,BU7411SG,BU7421G,BU7421SG
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www.rohm.com
VDD
VSS
IN+
IN-
VDD,VSS,EK,Vicm Unit:[V]
－ Calculation－
1. Input Offset Voltage (Vio)
2. Large Signal Voltage Gain (Av)
3 Common-mode Rejection Ratio (CMRR)
4. Power Supply Rejection Ratio (PSRR)
Input Offset Voltage
Large Signal Voltage Gain
Common-mode Rejection Ratio
(Input Common-mode Voltage Range)
Power Supply Rejection Ratio
Vicm
Parameter
○Input-Output Full Swing
RS＝50[Ω]
RS＝50[Ω]
BU7265/BU7271 family
50[kΩ]
0.015[μF]
Vbias
Vbias
Ri=1[MΩ]
Ri=1[MΩ]
SW2
SW1
0.015[μF]
AB control
class
VF6
VF1
VF2
VF3
VF4
VF5
VF7
VF
BU7265/
BU7271
BU7421
BU7411
VDD
VSS
DUT
Fig.93 Schematic Diagram
PSRR = 20Log
CMRR = 20Log
Vio =
Av = 20Log
Fig.94 Test circuit 1
ON
ON
ON
ON
ON
ON
ON
S1
VRL
SW3
1+Rf/Rs
OUT
|VF1|
RL
12/17
ON
ON
ON
ON
ON
ON
ON
S2
Rf=50[kΩ]
0.1[μF]
VDD
[V]
2 × (1+Rf /Rs)
VSS
|VF2-VF3|
⊿ VDD × (1+Rf /Rs)
⊿ Vicm × (1+Rf /Rs)
OFF
OFF
OFF
OFF
OFF
OFF
IN+
ON
IN-
S3
|VF6-VF7|
EK
|VF4-VF5|
RK=500[kΩ]
1000[pF]
VDD VSS
1.8
1.7
1.6
5.5
RK=500[kΩ]
3
3
3
[dB]
0
0
0
0
[dB]
[dB]
-1.5
-0.5
-2.5
-1.5
-0.9
EK
○Ground Sense
BU7411/BU7421 family
/BU7271
BU7265
Vbias
-15V
Vbias
NULL
15V
1.5
3
0
3
0
0.01[μF]
BU7411 BU7421
Vicm
AB control
2
1
0
2
0
class
Technical Note
2010.03 - Rev.A
V
VF
1.8
0.9
1.8
0
0
Calculation
1
2
3
4
OUT