AD584

Data Sheet

Rev. C | Page 10 of 12

The AD584 is normally used in the −10 V mode with the AD7574

to give a 0 V to +10 V ADC range. This is shown in Figure 17.

Bipolar output applications and other operating details can be

found in the data sheets for the CMOS products.

Figure 17. AD584 as −10 V Reference for CMOS ADC

PRECISION DAC REFERENCE

The AD565A, like many DACs, can operate with an external

10 V reference element (see Figure 19). This 10 V reference

voltage is converted into a reference current of approximately

0.5 mA via the internal 19.95 kΩ resistor (in series with the external

100 Ω trimmer). The gain temperature coefficient of the AD565A

is primarily governed by the temperature tracking of the 19.95 kΩ

resistor and the 5 kΩ/10 kΩ span resistors; this gain temperature

coefficient is guaranteed to 3 ppm/°C. Therefore, using the AD584K

(at 5 ppm/°C) as the 10 V reference guarantees a maximum full-

scale temperature coefficient of 18 ppm/°C more than the

commercial range. The 10 V reference also supplies the normal

1 mA bipolar offset current through the 9.95 kΩ bipolar offset

resistor. The bipolar offset temperature coefficient thus depends

only on the temperature coefficient matching of the bipolar offset

resistor to the input reference resistor and is guaranteed to

3 ppm/°C. Figure 18 demonstrates the flexibility of the AD584

applied to another popular digital-to-analog configuration.

Figure 18. Current Output, 8-Bit Digital-to-Analog Configuration

Figure 19. Precision 12-Bit DAC

–10V REF

AD584

4

1

8

–15V

V+

10.0V

COMMON

R3

1.2kΩ

5%

0.1µF

+15V

1

18

2

3

4

5

AD7574

(TOP VIEW)

SIGNAL

INPUT

0V TO +10V

ANALOG

GROUND

GROUND

INTERTIE

DIGITAL

SUPPLY

RETURN

R1

2kΩ 10%*

* R1 AND R2 CAN BE OMITTED IF

GAIN TRIM IS NOT REQUIRED.

GAIN TRIM

R2 2kΩ*

C

A1 (MSB)

5

14

A2

6

15

A3

7

A4

8

A5

9

A6

10

A7

11

4

A8 (LSB)

12

COMP

16

1

R15

R14 = R15

V+

13

V–

3

2

AD

DAC08

AD584

4

8

1

3

COMMON

V+

2.5V

10.0V

R14

0.5mA

DAC

AD565A

5kΩ

20V SPAN

10V SPAN

DAC OUT

REF

GND

BIPOLAR OFF

5kΩ

8kΩ

CODE INPUT

LSB

MSB

10V

REF OUT

REF

IN

POWER

GND

19.95

kΩ

20

kΩ

9.95kΩ

0.1µF

0.1µF

OP1177

+15V

–15V

2

3

6

OP AMP

OUTPUT

±10V

+15V

+15V

1

4

8

AD584

R2

100

Ω

15T

GAIN

ADJUST

R1

100

Ω

15T

BIPOLAR OFFSET

ADJUST

–15V