OP200ARC Datasheet, PDF (13/16 Pages) Analog Devices – Dual Low Offset, Low Power Operational Amplifiernull

Data Sheet
OP200
DUAL 12-BIT VOLTAGE OUTPUT DAC
The dual output DAC shown in Figure 33 is capable of providing
untrimmed 12-bit accurate operation over the entire military
temperature range. Offset voltage, bias current, and gain errors
of the OP200 contribute less than 1/10 of an LSB error at 12 bits
over the military temperature range.
5V
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 startup.
10V
REFERENCE
VOLTAGE
21
V_DD
DAC8221
4 ^VREF A
DAC A
1/2
DAC8221
R_{FB A} 3
I_{OUT A 2}
DAC DATA BUS
PIN 6 (MSB) TO PIN 17 (LSB)
R_{FB B} 23
8
2
1/2
1
OP200AZ
3
4
DAC
CONTROL
22 ^VREF B
DAC B
1/2
DAC8221
18 _{DAC A/DAC B}
19 _CS
20 _WR
DGND
5
I_{OUT B} 24
AGND 1
6
1/2
7
OP200AZ
5
Figure 33. Dual 12-Bit Voltage Output DAC
+5V
R1
22kΩ
D1
1N914
V_{IN 2}
V_OUT ⁶
REF43
TRIM ⁵
GND 4
+5V
2
8
1/2
1
OP200AZ
3
4
–5V
R3
10kΩ
R3
10kΩ
6
1/2
OP200AZ
7
5
R4
5kΩ
+2.5V
Figure 34. Dual Precision Voltage Reference
–2.5V
OUT A
V–
OUT B
Rev. E | Page 13 of 16