AD586

Rev. G | Page 11 of 16

5 V REFERENCE WITH MULTIPLYING

CMOS DACs OR ADCs

The AD586 is ideal for applications with 10- and 12-bit

multiplying CMOS DACs. In the standard hookup, as shown

in Figure 20, the AD586 is paired with the AD7545 12-bit

multiplying DAC and the AD711 high speed BiFET op amp.

The amplifier DAC configuration produces a unipolar 0 V to

−5 V output range. Bipolar output applications and other

operating details can be found in the individual product data

sheets.

AD586

GND

AD711K

0.1

µF

0.1

µF

–15V

0 V TO –5V

+15V

OUT 1

AGND

DGND

DB11 TO DB0

C1

33pF

R2

68

Ω

+15V

AD7545K

10k

Ω

TRIM

+15V

20

18

19

6

5

4

2

3

1

2

7

4

6

3

2

Figure 20. Low Power 12-Bit CMOS DAC Application

The AD586 can also be used as a precision reference for multi-

ple DACs. Figure 21 shows the AD586, the AD7628 dual DAC,

and the AD712 dual op amp hooked up for single-supply opera-

tion to produce 0 V to −5 V outputs. Because both DACs are on

the same die and share a common reference and output op

amps, the DAC outputs will exhibit similar gain TCs.

AD586

GND

AD712

OUT A

DGND

AGND

DAC A

DB0

DB7

DATA

INPUTS

OUT B

DAC B

RFB B

RFB A

AD7628

0TO–5V

0TO–5V

+15V

+15V

6

4

4

7

14

2

5

3

17

1

19

20

2

4

Figure 21. AD586 as a 5 V Reference for a CMOS

STACKED PRECISION REFERENCES FOR

MULTIPLE VOLTAGES

Often, a design requires several reference voltages. Three

AD586s can be stacked, as shown in Figure 22, to produce

5.000 V, 10.000 V, and 15.000 V outputs. This scheme can be

extended to any number of AD586s, provided the maximum

load current is not exceeded. This design provides the addi-

tional advantage of improved line regulation on the 5.0 V

that are below the noise level of the references.

22V TO 46V

AD586

GND

TRIM

10k

Ω

AD586

GND

TRIM

AD586

GND

TRIM

10k

Ω

10k

Ω

15V

10V

5V

2

4

5

6

2

4

5

6

2

4

5

6

Figure 22. Multiple AD586s Stacked for Precision 5 V, 10 V, and 15 V Outputs

PRECISION CURRENT SOURCE

The design of the AD586 allows it to be easily configured as a

the user can vary the load current from the quiescent current

(typically, 2 mA) to approximately 10 mA. The compliance volt-

age of this circuit varies from about 5 V to 21 V, depending on

AD586

GND

5V

(500

Ω MIN)

2

4

6

Figure 23. Precision Current Source

PRECISION HIGH CURRENT SUPPLY

For higher currents, the AD586 can easily be connected to a

power PNP or power Darlington PNP device. The circuit in

Figure 24 and Figure 25 can deliver up to 4 amps to the load.

The 0.1 µF capacitor is required only if the load has a significant

capacitive component. If the load is purely resistive, improved

high frequency supply rejection results can be obtained by

removing the capacitor.