OP200 Datasheet, PDF (10/12 Pages) Analog Devices – Dual Low Offset, Low Power Operational Amplifier

OP200
DUAL PRECISION VOLTAGE REFERENCE
A dual OP200 and a REF-43, 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 mV/mA. Line regulation is better than 15 mV/V and
output voltage drift is under 20 mV/∞C. Output voltage noise
from 0.1 Hz to 10 Hz is typically 75 mV 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 DAC-8212, 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
OP-200AZ
3
2
6
REF-43A
4
6
1/2
OP200AZ
5
4
–5V
7
R4
5k⍀
R3
10k⍀
–2.5V
Figure 8. Dual Precision Voltage Reference
V_IN
21
V_DD
10V
REFERENCE
2 ^IOUT^A
DAC A
1/2
DAC8212AV
R_REFA ₄
3
R1
10k⍀ ₂
DAC DATA BUS
PINS 6(MSB) – 17(LSB)
DAC
CONTROL
SIGNALS
24 ^IOUT^B
DAC B
1/2
DAC8212AV
R_REFB 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. A