OP290(RevB) 데이터 시트보기 (PDF) - Analog Devices

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OP290
(Rev.:RevB)

Precision, Low Power, Micropower Dual Operational Amplifier

Analog Devices 

+15V

R1

250k⍀

C1

0.1␮F

2

8

1/2

1

OP290GP

3

R2

100k⍀

OP290

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.

V+

D1

D2

R3

1M⍀

R4

C1

6

25k⍀ 4700pF

1/2

7

OP290GP

5

4

VOUT

–15V

DIODES ARE 1N4148

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 µV/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.

VOUT = 2.5V 1 + RR21

2

VIN

REF-43FZ

VOUT 6

GND

4

2

8

1/2

1

OP290GP

3

4

R1B

200⍀

20-TURN

BOURNS 3006P-1-201

R1A

2.37⍀

1%

R2

2k⍀

1%

2N2907A

VOUT

C1

10␮F

C2

0.1␮F

Figure 7. Low Overhead Voltage Reference

REV. B

–9–

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