Datasheet

OP200 Data Sheet
Rev. G | 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).
00322-035
DAC A
1/2
DAC8221
DAC DATA BUS
PIN 6 (MSB) TO PIN 17 (LSB)
1/2
OP200AZ
1/2
OP200AZ
V
REF A
V
DD
V
REF B
I
OUT A
I
OUT B
3
5
4
1
8
7
2
21
2
24
4
22
DGND
18
19
20
10V
REFERENCE
VOLTAGE
V
IN
15
V
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