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STRUCTURE
FUNCTION
SILICON MONOLITHIC INTEGRATED CIRCUIT
LOW INPUT OFFSET VOLTAGE CMOS OPERATIONAL AMPLIFIER
PRODUCT SERIES
BU5281G
BU5281SG
・Wide output voltage range(VSS½VDD)
・Low input bias current(1[pA] typ.)
・Low input offset voltage(2.5[mV] Max.)
・Slew Rate(2.0[V/μs] typ.)
・Low supply current(750[μA] typ.)
・Low
power supply voltage operation(1.8[V]½5.5[V])
FEATURES
○ABSOLUTE MAXIMUM RATINGS(Ta=25[℃])
Parameter
Supply Voltage
Power dissipation
Differential Input Voltage(*3)
Input Common-mode Voltage Range
Operating Temperature range
Topr
BU5281S
Storage Temperature Range
Maximum junction Temperature
Tstg
Tjmax
-40½+105
-55½+125
+125
℃
℃
Symbol
VDD-VSS
Pd
Vid
Vicm
BU5281
Rating
＋7
540(*1)(*2)
VDD-VSS
(VSS-0.3)½VDD+0.3
-40½+85
℃
Unit
V
mW
V
V
・This IC is not designed for protection against radioactive rays.
(*1) To use at temperature above Ta＝25[℃] reduce 5.4[mW].
(*2) Mounted on a glass epoxy PCB(70[mm]×70[mm]×1.6[mm]).
(*3) The voltage difference between inverting input and non-inverting input is the differential input voltage.
Then input terminal voltage is set to more than VSS.
○OPERATING CONDITION(BU5281:Ta=-40[℃]½+85[℃] BU5281S:Ta=-40[℃]½+105[℃])
Parameter
Supply Voltage
Symbol
VDD
Rating
＋1.8½＋5.5 (Single Supply)
Unit
V
REV. B
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○ELECTRICAL CHARACTERISTICS (unless otherwise specified VDD=+3[V]、VSS=0[V])
Parameter
Input offset voltage(*4)
Input offset voltage drift(*4)
Input offset current(*4)
Input bias current(*4)
Supply current(*6)
IDD
Full range
High level output voltage
Low level output voltage
Large signal voltage gain
Input common mode voltage
Common mode rejection ratio
Power supply rejection ratio
Output source current (*5)
Output sink current (*5)
Slew rate
Gain band width
Phase margin
Input referred noise voltage
Vni
Total harmonics distortion
THD
25℃
-
25℃
-
3.2
0.003
-
-
μVrms
%
AV=40[dB],DINAUDIO
VOUT=0.4[Vp-p],f=1[kHz]
VOH
VOL
AV
Vicm
CMRR
PSRR
IOH
IOL
SR
FT
θ
25℃
25℃
25℃
25℃
25℃
25℃
25℃
25℃
25℃
25℃
25℃
-
VDD-0.1
-
70
0
45
60
5
10
-
-
-
-
-
-
-
110
-
60
80
8
16
2.0
3
40°
18
1200
-
VSS+0.1
-
1.8
-
-
-
-
-
-
-
-
V
V
dB
V
dB
dB
mA
mA
V/μs
MHz
VDD-0.4[V]
VSS+0.4[V]
CL=25[pF]
CL=25[pF], AV=40[dB]
CL=25[pF], AV=40[dB]
nV/(Hz)
1/2
AV=40[dB],f=1[kHz]
Symbol
Vio
ΔVio/ΔT
Iio
Ib
Temperature
range
Guaranteed Limit
Min.
-
-
-
-
-
Typ.
0.1
0.8
1
1
750
Max.
2.5
-
-
-
1000
Unit
mV
μV/℃
pA
pA
μA
Condition
25℃
-
25℃
25℃
25℃
RL=∞ All Op-Amps
AV=0[dB],VIN=0.9[V]
RL=10[kΩ]
RL=10[kΩ]
RL=10[kΩ]
VSS½VDD-1.2
(*4) Absolute value
(*5) Reference to power dissipation under the high temperature environment and decide the output current.
Continuous short circuit is occurring the degenerate of output current characteristics.
(*6) Full range BU5281:Ta=-40[℃]½+85[℃] BU5281S:Ta=-40[℃]½+105[℃]
REV. B
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○
Physical Dimensions
BU5281G(SSOP5) (Unit：[mm])
BU5281SG(SSOP5) (Unit：[mm])
○Block diagram
○Pin No.・Pin Name
Pin No.
Pin Name
IN+
VSS
IN-
OUT
VDD
IN+
VSS
IN-
1
2
3
G:SSOP5
5
＋
－
VDD
1
2
3
4
5
4
OUT
○Application example
(1) Absolute maximum ratings
Absolute maximum ratings are the values which indicate the limits,
within which the given voltage range can be safely charged to the terminal.
However, it does not guarantee the circuit operation.
(2) Applied voltage to the input terminal
For normal circuit operation of operational amplifier, please input voltage for its
input terminal within input common mode voltage VDD+0.3[V].
Then, regardless of power supply voltage,VSS-0.3[V] can be applied to input
terminals without deterioration or destruction of its characteristics.
(3) Operating power supply (split power supply/single power supply)
The operational amplifier operates if a given level of voltage is applied between VDD and
VSS. Therefore, the operational amplifier can be operated under single power supply
or split power supply.
(4) Power dissipation (pd)
If the IC is used under excessive power dissipation. An increase in the chip temperature will cause
deterioration of the radical characteristics of IC.
For example, reduction of current capability. Take consideration of the effective power dissipation and
thermal design with a sufficient margin. Pd is reference to the provided power dissipation curve.
(5) Short circuits between pins and incorrect mounting
Short circuits between pins and incorrect mounting when mounting the IC on a printed circuits board,
take notice of the direction and positioning of the IC.
If IC is mounted erroneously, It may be damaged. Also, when a foreign object is inserted between
output, between output and VDD terminal or VSS terminal which causes short circuit, the IC may be damaged.
REV. B
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(6) Output short circuit
If short circuit occurs between the output terminal and VDD terminal, excessive
in output current may flow and generate heat, causing destruction of the IC. Take due care.
(7) Using under strong electromagnetic field
Be careful when using the IC under strong electromagnetic field because it may malfunction.
(8) Usage of IC
When stress is applied to the IC through warp of the printed circuit board,
The characteristics may fluctuate due to the piezo effect.
Be careful of the warp of the printed circuit board.
(9) Testing IC on the set board
When testing IC on the set board, in cases where the capacitor is connected to the low impedance,
make sure to discharge per fabrication because there is a possibility that IC may be damaged by stress.
When removing IC from the set board, it is essential to cut supply voltage.
As a countermeasure against the static electricity, observe proper grounding during fabrication process
and take due care when carrying and storage it.
(10) The IC destruction caused by capacitive load
The transistors in circuits may be damaged when VDD terminal and VSS terminal is shorted with the charged
output terminal capacitor.
When IC is used as a operational amplifier or as an application circuit, where oscillation is not activated
by an output capacitor,the output capacitor must be kept below 0.1[μF] in order to prevent the damage
mentioned above.
(11) Decupling capacitor
Insert the deculing capacitance between VDD and VSS, for stable operation of operational amplifier.
(12) Latch up
Be careful of input vltage that exceed the VDD and VSS. When CMOS device have sometimes occur
latch up operation. And protect the IC from abnormaly noise
REV. B
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