AD660ARZ datasheet(13/21 Pages) AD

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AD660

Rev. B | Page 12 of 20

It is also possible to use external references other than 10 V with

slightly degraded linearity specifications. The recommended

range of reference voltages is 5 V to 10.24 V, which allows 5 V,

8.192 V, and 10.24 V ranges to be used. For example, by using

the AD586 5 V reference, outputs of 0 V to 5 V unipolar or ±5 V

bipolar can be realized. Using the AD586 voltage reference

makes it possible to operate the AD660 with ±12 V supplies

with 10% tolerances.

Figure 12 shows the AD660 using the AD586 precision 5 V

reference in the bipolar configuration. The highest grade

AD586MN is specified with a drift of 2 ppm/°C, which is a

7.5× improvement over the AD660 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

Configuration section. Use −5.000000 V and +4.999847, as the

output values.

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

using the same configuration shown in Figure 12 to produce a

±10 V output. The highest grade AD587UQ is specified at

5 ppm/°C, which is a 3× improvement over the AD660 internal

reference.

Figure 13 shows the AD660 using the AD688 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 precise

biasing for the offset trim resistor, R4.

HBE

CONTROL

LOGIC

SER

CLR

LDAC

REF IN

GND

TRIM

VOUT

VIN

50Ω

10kΩ

50Ω

REF OUT

AD660

AD586

SOUT

VOUT

AGND

SPAN/

BIPOLAR

OFFSET

DGND

–VEE

+VCC

+VLL

10V REF

16-BIT LATCH

16-BIT DAC

OUTPUT

10kΩ

10.05kΩ

DB1/DB9/

DATADIR

LBE/

CLEAR SELECT

DB0/

DB8/

SIN

DB7/

DB15

16-BIT LATCH

Figure 12. Using the AD660 with the AD586 5 V Reference

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