OP200GZ(2004) Ver la hoja de datos (PDF) - Analog Devices

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OP200GZ
(Rev.:2004)

Dual Low Offset, Low Power Operational Amplifier

Analog Devices 

OP200

Dual Precision Voltage Reference

A dual OP200 and a REF43, a 2.5 V reference, can be used to

build a ± 2.5 V precision voltage reference. Maximum output

current from each reference is ± 10 mA with load regulation

under 25 µV/mA. Line regulation is better than 15 µV/V and

output voltage drift is under 20 µV/°C. Output voltage noise

from 0.1 Hz to 10 Hz is typically 75 µV p-p. R1 and D1 ensure

correct start-up.

Programmable High Resolution Window Comparator

The programmable window comparator shown in Figure 9 is

easily capable of 12-bit accuracy over the full military tempera-

ture range. A dual CMOS 12-bit DAC, the DAC8212, is used

in the voltage switching mode to set the upper and lower thresh-

olds (DAC A and DAC B, respectively).

+5V

–2.5V

R1

22k⍀

D1

1N914

R2

10k⍀

8

2

1/2

OP200AZ

3

2

6

REF43A

4

6

1/2

OP200AZ

4

–5V

7

5

R4

5k⍀

R3

10k⍀

–2.5V

Figure 8. Dual Precision Voltage Reference

VIN

21

VDD

10V

REFERENCE

2 IOUTA

DAC A

1/2

DAC8212AV

RREFA 4

3

R1

10k⍀ 2

DAC DATA BUS

PINS 6(MSB) – 17(LSB)

DAC

CONTROL

SIGNALS

24 IOUTB

DAC B

1/2

DAC8212AV

RREFB 22

18 DAC A/DAC B

19 CS

20 WR

DGND

5

AGND

1

–15V

4

R2

10k⍀

5

15V

8

+

1/2

OP200AZ

–

+

1/2

OP200AZ

–

1

5V

D1

1N4148 R3

10k⍀

D2

1N4148

7

R4

10k⍀

OUTB

TTL OUT

Q1

2N2222

Figure 9. Programmable High Resolution Window Comparator

–10–

REV. B

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