Datasheet
Operational Amplifiers
High Speed Low Voltage Operation
CMOS Operational Amplifiers
BU7481G
BU7481SG
Key Specifications
Operating Supply Voltage (single supply):
+1.8V to +5.5V
Slew Rate:
3.2V/µs
Temperature Range:
BU7481G
-40°C to +85°C
BU7481SG
-40°C to +105°C
Input Offset Current:
1pA (Typ)
Input Bias Current:
1pA (Typ)
General Description
The BU7481xx are input ground sense, output full swing,
low voltage operation, low input offset voltage and high
speed operational amplifiers. It has a MOSFET input
with a small input bias current of 1pA(Typ), suitable for
sensor amplifier applications.
Features
Low Operating Supply Voltage
High Large Signal Voltage Gain
Low Input Bias Current
High Slew Rate
Applications
Buffer
Active Filter
Sensor Amplifier
Mobile Equipment
Pin Configuration
BU7481G, BU7481SG : SSOP5
Package
SSOP5
W(Typ) x D(Typ) x H(Max)
2.90mm x 2.80mm x 1.25mm
Pin No.
IN+
VSS
IN-
1
2
3
+
-
4
OUT
5
VDD
Pin Name
IN+
VSS
IN-
OUT
VDD
1
2
3
4
5
Package
SSOP5
BU7481G
BU7481SG
Ordering Information
B
U
7
4
8
1
x
x
Package
G:SSOP5
-
T
R
Part Number
BU7481G
BU7481SG
Packaging and forming specification
TR: Embossed tape and reel
○Product
structure：Silicon monolithic integrated circuit
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○This
product has no designed protection against radioactive rays.
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BU7481G
Line-up
BU7481SG
Datasheet
T
opr
-40°C to +85°C
-40°C to +105°C
SSOP5
SSOP5
Package
Reel of 3000
Reel of 3000
Orderable Part Number
BU7481G-TR
BU7481SG-TR
Absolute Maximum Ratings
(T
A
=25°C)
Parameter
Supply Voltage
Power Dissipation
Differential Input Voltage
(Note 3)
Symbol
VDD - VSS
P
D
V
ID
V
ICM
I
I
V
opr
T
opr
T
stg
T
Jmax
Rating
BU7481G
+7
0.54
(Note 1,2)
BU7481SG
Unit
V
W
V
V
mA
V
VDD - VSS
(VSS - 0.3) to (VDD + 0.3)
±10
+1.8 to +5.5
- 40 to +85
- 55 to +125
+125
- 40 to +105
Input Common-mode Voltage
Range
Input Current
(Note 4)
Operating Supply Voltage
Operating Temperature
Storage Temperature
Maximum Junction Temperature
°C
°C
°C
(Note 1) To use at temperature above T
A
=25C reduce 5.4mW.
(Note 2) Mounted on a FR4 glass epoxy PCB 70mm×70mm×1.6mm (Copper foil area less than 3%).
(Note 3) The voltage difference between inverting input and non-inverting input is the differential input voltage.
Then input pin voltage is set to more than VSS.
(Note 4) An excessive input current will flow when input voltages of more than VDD+0.6V or less than VSS-0.6V are applied.
The input current can be set to less than the rated current by adding a limiting resistor.
Caution: Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open
circuit between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case
the IC is operated over the absolute maximum ratings.
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BU7481G
BU7481SG
Datasheet
Electrical Characteristics
○BU7481G,
BU7481SG (Unless otherwise specified VDD=+3V, VSS=0V, T
A
=25°C)
Limit
Temperature
Parameter
Symbol
Range
Min
Typ
Max
Input Offset Voltage
(Note 5)
Input Offset Current
Input Bias Current
(Note 5)
(Note 5)
Unit
mV
pA
pA
μA
V
V
dB
V
dB
dB
mA
mA
V/μs
MHz
deg
%
Conditions
-
-
-
R
L
=∞
A
V
=0dB, IN+=0.9V
R
L
=10kΩ
R
L
=10kΩ
R
L
=10kΩ
VSS to VDD-1.2V
-
-
OUT=VDD-0.4V
OUT=VSS+0.4V
C
L
=25pF
C
L
=25pF, A
V
=40dB
C
L
=25pF, A
V
=40dB
OUT=0.8V
P-P
, f=1kHz
V
IO
I
IO
I
B
I
DD
V
OH
V
OL
Av
V
ICM
CMRR
PSRR
I
SOURCE
I
SINK
SR
f
T
θ
THD+N
25°C
25°C
25°C
25°C
Full Range
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
-
-
-
-
-
VDD-0.1
-
70
0
45
60
5
9
-
-
-
-
1
1
1
420
-
-
-
105
-
60
80
8
16
3.2
2.8
50
0.03
8
-
-
750
900
-
VSS+0.1
-
1.8
-
-
-
-
-
-
-
-
Supply Current
(Note 6)
High Level Output Voltage
Low Level Output Voltage
Large Signal Voltage Gain
Input Common-mode
Voltage Range
Common-mode Rejection Ratio
Power Supply Rejection Ratio
Output Source Current
(Note 7)
Output Sink Current
(Note 7)
Slew Rate
Unity Gain Frequency
Phase Margin
Total Harmonic Distortion +
Noise
(Note 5) Absolute value
(Note 6) Full range BU7481: T
A
=-40°C to +85°C BU7481S: T
A
=-40°C to +105°C
(Note 7) Consider the power dissipation of the IC under high temperature environment when selecting the output current value.
There may be a case where the output current value is reduced due to the rise in IC temperature caused by the heat generated inside the IC.
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BU7481G
BU7481SG
Datasheet
Description of Electrical Characteristics
Described below are descriptions of the relevant electrical terms used in this datasheet. Items and symbols used are also
shown. Note that item name and symbol and their meaning may differ from those on another manufacturer’s document or
general document.
1. Absolute maximum ratings
Absolute maximum rating items indicate the condition which must not be exceeded. Application of voltage in excess of absolute
maximum rating or use out of absolute maximum rated temperature environment may cause deterioration of characteristics.
(1) Supply Voltage (VDD/VSS)
Indicates the maximum voltage that can be applied between the VDD terminal and VSS terminal without
deterioration or destruction of characteristics of internal circuit.
(2) Differential Input Voltage (V
ID
)
Indicates the maximum voltage that can be applied between non-inverting and inverting terminals without damaging
the IC.
(3) Input Common-mode Voltage Range (V
ICM
)
Indicates the maximum voltage that can be applied to the non-inverting and inverting terminals without deterioration
or destruction of electrical characteristics. Input common-mode voltage range of the maximum ratings does not assure
normal operation of IC. For normal operation, use the IC within the input common-mode voltage range characteristics.
(4) Power Dissipation (P
D
)
Indicates the power that can be consumed by the IC when mounted on a specific board at the ambient temperature 25°C
(normal temperature). As for package product, P
D
is determined by the temperature that can be permitted by the IC in
the package (maximum junction temperature) and the thermal resistance of the package.
2. Electrical characteristics
(1) Input Offset Voltage (V
IO
)
Indicates the voltage difference between non-inverting terminal and inverting terminals. It can be translated into the
input voltage difference required for setting the output voltage at 0 V.
(2) Input Offset Current (I
IO
)
Indicates the difference of input bias current between the non-inverting and inverting terminals.
(3) Input Bias Current (I
B
)
Indicates the current that flows into or out of the input terminal. It is defined by the average of input bias currents at
the non-inverting and inverting terminals.
(4) Supply Current (I
DD
)
Indicates the current that flows within the IC under specified no-load conditions.
(5) High Level Output Voltage (High) / Low Level Output Voltage (Low) (VOH/VOL)
Indicates the voltage range of the output under specified load condition. It is typically divided into maximum output
voltage high and low. maximum output voltage high indicates the upper limit of output voltage. maximum output
voltage low indicates the lower limit.
(6) Large Signal Voltage Gain (A
V
)
Indicates the amplifying rate (gain) of output voltage against the voltage difference between non-inverting terminal
and inverting terminal. It is normally the amplifying rate (gain) with reference to DC voltage.
A
V
= (Output voltage) / (Differential Input voltage)
(7) Input Common-mode Voltage Range (V
ICM
)
Indicates the input voltage range where IC normally operates.
(8) Common-mode Rejection Ratio (CMRR)
Indicates the ratio of fluctuation of input offset voltage when the input common mode voltage is changed. It is
normally the fluctuation of DC.
CMRR = (Change of Input common-mode voltage)/(Input offset fluctuation)
(9) Power Supply Rejection Ratio (PSRR)
Indicates the ratio of fluctuation of input offset voltage when supply voltage is changed.
It is normally the fluctuation of DC.
PSRR = (Change of power supply voltage)/(Input offset fluctuation)
(10) Output Source Current/ Output Sink Current (I
SOURCE
/ I
SINK
)
The maximum current that can be output from the IC under specific output conditions. The output source current
indicates the current flowing out from the IC, and the output sink current indicates the current flowing into the IC.
(11) Slew Rate (SR)
Indicates the ratio of the change in output voltage with time when a step input signal is applied.
(12) Unity Gain Frequency (f
T
)
Indicates a frequency where the voltage gain of operational amplifier is 1.
(13) Phase Margin (θ)
Indicates the margin of phase from 180 degree phase lag at unity gain frequency.
(14) Total Harmonic Distortion + Noise (THD+N)
Indicates the fluctuation of input offset voltage or that of output voltage with reference to the change of output voltage
of driven channel.
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Test/Measurement
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