bu7255shfv ROHM Co. Ltd., bu7255shfv Datasheet - Page 20

• Manufacturer Part Number: bu7255shfv
• Description: Operational Amplifiers / Comparators High Speed With Low Voltage Cmos Operational Amplifiers
• Manufacturer: ROHM Co. Ltd.

●Test circuit 1 NULL method
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BU7291G,BU7291SG,BU7255HFV,BU7255SHFV,
BU7495HFV,BU7495SHFV,BU7481G,BU7481SG,BU7485G,BU7485SG,BU5281G,BU5281SG
www.rohm.com
○Input-Output Full Swing BU7291/BU7255 family
○Ground Sense BU7495/BU7481/BU7485/BU5281 family
－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
Input Offset Voltage
Large Signal Voltage Gain
Common-mode Rejection Ratio
(Input Common-mode Voltage Range)
Power Supply
Rejection Ratio
Vicm
RS=50[Ω]
RS=50[Ω]
Parameter
Parameter
BU7495/BU7481/BU5281
BU7485
50[kΩ]
0.015[µF]
Ri=1[MΩ]
Ri=1[MΩ]
SW1
SW2
0.015[µF]
Fig.139 Test circuit 1 (one channel only)
VDD
VSS
DUT
VF1
VF2
VF3
VF4
VF5
VF6
VF7
VF1
VF2
VF3
VF4
VF5
VF6
VF7
VF
VF
VRL
SW3
RL
Vo
PSRR
Vio
CMRR
Av
ON
ON
ON
ON
20/26
S1
ON
ON
ON
ON
S1
Rf=50[kΩ]
=
=
0.1[µF]
20Log
=
=
EK
1+Rf/Rs
20Log
ON
ON
ON
ON
20Log
S2
|VF1|
1000[pF]
500[kΩ]
ON
ON
ON
ON
S2
500[kΩ]
2×(1+Rf/Rs)
|VF2-VF3|
OFF
OFF
OFF
ON
ΔV
1.8×(1+Rf/Rs)
S3
ΔVicm×(1+Rf/Rs)
3.8×(1+Rf/Rs)
|VF6-VF7|
[V]
|VF4-VF5|
OFF
OFF
OFF
ON
DD
S3
×(1+Rf/Rs)
VDD
2.4
5.5
3
3
3
VDD
1.8
3.0
5.5
3
3
3
[dB]
VSS
NULL
15[V]
-15[V]
0
0
0
0
[dB]
[dB]
0.01[µF]
[dB]
VSS
[dB]
0
0
0
0
VDD, VSS, EK, Vicm Unit:[V]
VDD, VSS, EK, Vicm Unit:[V]
-1.5
-0.5
-2.5
-1.5
-1.2
EK
-1.5
-0.5
-2.5
-1.5
-0.9
EK
V
Vicm
VF
1.5
Technical Note
0
2010.12 - Rev.A
3
0
3
Vicm
1.8
0.9
1.8
0
0
Calculation
Calculation
1
2
3
4
1
2
3
4