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PDF OP482 Data sheet ( Hoja de datos )

Número de pieza OP482
Descripción Dual/Quad Low Power / High Speed JFET Operational Amplifiers
Fabricantes Analog Devices 
Logotipo Analog Devices Logotipo



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a
Dual/Quad Low Power, High Speed
JFET Operational Amplifiers
OP282/OP482
FEATURES
High Slew Rate: 9 V/s
Wide Bandwidth: 4 MHz
Low Supply Current: 250 A/Amplifier
Low Offset Voltage: 3 mV
Low Bias Current: 100 pA
Fast Settling Time
Common-Mode Range Includes V+
Unity Gain Stable
APPLICATIONS
Active Filters
Fast Amplifiers
Integrators
Supply Current Monitoring
GENERAL DESCRIPTION
The OP282/OP482 dual and quad operational amplifiers feature
excellent speed at exceptionally low supply currents. Slew rate
exceeds 7 V/µs with supply current under 250 µA per amplifier.
These unity gain stable amplifiers have a typical gain bandwidth
of 4 MHz.
The JFET input stage of the OP282/OP482 insures bias current
is typically a few picoamps and below 500 pA over the full
temperature range. Offset voltage is under 3 mV for the dual
and under 4 mV for the quad.
With a wide output swing, within 1.5 volts of each supply, low
power consumption and high slew rate, the OP282/OP482 are
ideal for battery-powered systems or power restricted applica-
tions. An input common-mode range that includes the positive
supply makes the OP282/OP482 an excellent choice for high-
side signal conditioning.
The OP282/OP482 are specified over the extended industrial
temperature range. Both dual and quad amplifiers are available
in plastic and ceramic DIP plus SOIC surface mount packages.
PIN CONNECTIONS
8-Lead Narrow-Body SOIC
8-Lead Epoxy DIP
(S Suffix)
(P Suffix)
OUT A 1
–IN A 2
+IN A 3
V– 4
OP282
8 V+
7 OUT B
6 –IN B
5 +IN B
OUT A 1
–IN A 2
+IN A 3
V– 4
OP282
OP-482
8 V+
7 OUT B
6 –IN B
5 +IN B
14-Lead Epoxy DIP
(P Suffix)
14-Lead Narrow-Body SOIC
(S Suffix)
OUT A 1
–IN A 2
+IN A 3
V+ 4
+IN B 5
–IN B 6
OUT B 7
OP482
14 OUT D
13 –IN D
12 +IN D
11 V–
10 +IN C
9 –IN C
8 OUT C
OUT A 1
–IN A 2
+IN A 3
V+ 4
+IN B 5
–IN B 6
OUT B 7
OP482
14 OUT B
13 –IN D
12 +IN D
11 V–
10 +IN C
9 –IN C
8 OUT C
REV. B
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703

1 page




OP482 pdf
The circuit shown in Figure 3 can be used to accurately
program the “Q,” the cutoff frequency fC, and the gain of a two
pole state-variable filter. OP482s have been used in this design
because of their high bandwidths, low power and low noise.
This circuit takes only three packages to build because of the
quad configuration of the op amps and DACs.
The DACs shown are all used in the voltage mode so all values
are dependent only on the accuracy of the DAC and not on the
absolute values of the DAC’s resistive ladders. This make this
circuit unusually accurate for a programmable filter.
Adjusting DAC 1 changes the signal amplitude across R1;
therefore, the DAC attenuation times R1 determines the
amount of signal current that charges the integrating capacitor,
C1. This cutoff frequency can now be expressed as:
OP282/OP482
fc
=
1
2πR1C1

D1
256

where D1 is the digital code for the DAC.
Gain of this circuit is set by adjusting D3. The gain equation is:
Gain
=
R4
R5

D3
256

DAC 2 is used to set the “Q” of the circuit. Adjusting this DAC
controls the amount of feedback from the bandpass node to the
input summing node. Note that the digital value of the DAC is
in the numerator, therefore zero code is not a valid operating point.
Q
=
R2
R3
256
 D2 
1/4
DAC8408
VIN
-
+
1/4
OP482
R5
2k
R7
2k
R4
2k 1/4
DAC8408
-
+
1/4
OP482
HIGH PASS
-
+
1/4
OP482
R1
2k
C1
1000pF
1/4
DAC8408
-
+
1/4
OP482
C1
1000pF
R1
- 2k
+
1/4
OP482
-
+ LOW
1/4 PASS
OP482
R6
2k 1/4
R3 DAC8408
2k
R2
BANDPASS
-
+
1/4
OP482
1k -
+
1/4
OP482
Figure 3.
REV. B
–5–

5 Page





OP482 arduino
8-Lead Narrow-Body SOIC
(S Suffix)
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
OP282/OP482
8-Lead Epoxy DIP
(P Suffix)
14-Lead Narrow-Body SOIC
(S Suffix)
14-Lead Epoxy DIP
(P Suffix)
20-Position Chip Carrier
(RC Suffix)
REV. B
–11–

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