AD660

REV. A

–8–

Figure 5 shows the AD660 using the AD586 precision 5 V refer-

ence in the bipolar configuration. The highest grade AD586MN

is specified with a drift of 2 ppm/

°C which is a 7.5× improve-

ment over the AD660’s internal reference. This circuit includes

two optional potentiometers and one optional resistor that can

be used to adjust the gain, offset and bipolar zero errors in a

manner similar to that described in the BIPOLAR CONFIGU-

RATION section. Use –5.000000 V and +4.999847 as the out-

put values.

The AD660 can also be used with the AD587 10 V reference,

using the same configuration shown in Figure 5 to produce a

±10 V output. The highest grade AD587LR, N is specified at

5 ppm/

°C, which is a 3× improvement over the AD660’s inter-

nal reference.

Figure 6 shows the AD660 using the AD680 precision

±10 V

reference, in the unipolar configuration. The highest grade

AD688BQ is specified with a temperature coefficient of

1.5 ppm/

°C. The ±10 V output is also ideal for providing pre-

cise biasing for the offset trim resistor R4.

16-BIT LATCH

16-BIT DAC

CONTROL

LOGIC

+10V REF

16-BIT LATCH

20

24

22

21

5

11

12

16

15

14

13

17

18

19

23

AD660

10k

10.05k

10k

HBE

LBE

CS

SIN/

DB0

MSB/LSB/

DB1

DB7

S

OUT

SPAN/

BIP OFF

V

OUT

AGND

REF OUT

REF IN

LDAC

CLR

SER

DGND

–V

EE

+V

CC

+V

LL

1

2

3

4

OUTPUT

R2

50

Ω

5

6

4

2

AD586

GND

TRIM

V

OUT

+V

CC

R2

10k

Ω

R1

100

Ω

UNI/BIP CLR/

Figure 5. Using the AD660 with the AD586 5 V Reference

16-BIT LATCH

16-BIT DAC

CONTROL

LOGIC

+10V REF

16-BIT LATCH

20

24

22

21

5

11

12

15

14

13

17

18

19

23

AD660

10k

10.05k

10k

HBE

LBE

CS

SIN/

DB0

DB7

S

OUT

SPAN/

BIP OFF

V

OUT

AGND

REF OUT

REF IN

LDAC

CLR

SER

–V

EE

+V

CC

+V

LL

1

2

3

4

MSB/LSB/

DB1

OUTPUT

0 TO +10V

R4

10k

Ω

R2

100

Ω

R3

10k

R1

100

Ω

R1

R2

R5

R6

R3

AD688

A3

A1

A4

A2

R4

1

15

14

2

16

11 13

3

4

6

7

8

9

12

5

10

UNI/BIP CLR/

16

DGND

Ω

Figure 6. Using the AD660 with the AD688 High Precision

±10 V Reference