Data Sheet

OP200

Rev. E | Page 13 of 16

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.

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.

DAC A

1/2

DAC8221

DAC8221

DAC DATA BUS

1/2

OP200AZ

1/2

OP200AZ

OUT A

V–

OUT B

2

6

1

8

4

7

3

3

21

4

22

2

23

24

AGND

DGND

1

5

18

19

20

10V

REFERENCE

VOLTAGE

5V

5

DAC B

1/2

DAC8221

DAC

CONTROL

DAC A/DAC B

CS

WR

Figure 33. Dual 12-Bit Voltage Output DAC

1/2

OP200AZ

REF43

TRIM

GND

1/2

OP200AZ

–2.5V

+2.5V

–5V

R1

22kΩ

D1

1N914

1

7

4

8

2

6

6

5

5

4

2

3

R3

10kΩ

+5V

+5V

R3

10kΩ

R4

5kΩ

Figure 34. Dual Precision Voltage Reference