OP200

Data Sheet

Rev. E | Page 14 of 16

PROGRAMMABLE HIGH RESOLUTION WINDOW

COMPARATOR

The programmable window comparator shown in Figure 35 is

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

range. A dual CMOS 12-bit DAC, the DAC8221, is used in the

voltage switching mode to set the upper and lower thresholds

(DAC A and DAC B, respectively).

DAC A

1/2

DAC8221

DAC DATA BUS

PIN 6 (MSB) TO PIN 17 (LSB)

1/2

OP200AZ

1/2

OP200AZ

3

5

4

1

8

7

2

21

2

24

4

22

DGND

18

19

20

10V

REFERENCE

VOLTAGE

15V

6

DAC B

1/2

DAC8221

DAC

CONTROL

SIGNALS

DAC A/DAC B

CS

WR

5

AGND

1

R2

10kΩ

R1

10kΩ

D1

1N4148

D1

1N4148

Q1

2N2222

R4

10kΩ

R2

10kΩ

TTL OUT

5V

15V–

Figure 35. Programmable High Resolution Window Comparator