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OP290GS Datasheet(PDF) 10 Page - Analog Devices

No. de pieza OP290GS
Descripción Electrónicos  Precision, Low Power, Micropower Dual Operational Amplifier
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OP290GS Datasheet(HTML) 10 Page - Analog Devices

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REV. A
OP290
–10–
1/2
OP290GP
1
1/2
OP290GP
3
2
7
6
5
R1
250k
C1
0.1 F
+15V
–15V
VOUT
R2
100k
R3
1M
D2
D1
DIODES ARE 1N4148
4
R4
25k
C1
4700pF
8
Figure 6. Variable Slew Rate Filter
LOW OVERHEAD VOLTAGE REFERENCE
Figure 7 shows a voltage reference that requires only 0.1 V of
overhead voltage. As shown, the reference provides a stable
4.5 V output with a 4.6 V to 36 V supply. Output voltage drift is
only 12 ppm/
°C. Line regulation of the reference is under 5 HV/V
with load regulation better than 10
µV/mA with up to 50 mA of
output current.
The REF-43 provides a stable 2.5 V which is multiplied by the
OP290. The PNP output transistor enables the output voltage
to approach the supply voltage.
Resistors R1 and R2 determine the output voltage.
VV
R
R
OUT
=+


25
1
2
1
.
The 200
Ω variable resistor is used to trim the output voltage.
For the lowest temperature drift, parallel resistors can be used in
place of the variable resistor and taken out of the circuit as required
to adjust the output voltage.
6
2
4
REF-43FZ
R1B
200
20-TURN
BOURNS 3006P-1-201
VOUT
VIN
VOUT
GND
R1A
2.37
1%
C1
10 F
C2
0.1 F
V+
R2
2k
1%
2N2907A
1
1/2
OP290GP
3
2
8
4
Figure 7. Low Overhead Voltage Reference


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