AD569

REV. A

–8–

Figure 9. MSB Resistor Divider

Figure 10. Reference Buffer Amplifier Connections

Figure 11. Ultralow Drift

±5 V Tracking Reference

Figure 12. Low-Cost

±5 V Reference

+5 V reference. A dual op amp, the AD712, buffers the refer-

ence input terminals preserving the absolute accuracy of the

AD569. The optional noise-reduction capacitor and gain

adjust trimmer allow further elimination of errors. The low-

cost AD584 offers 2.5 V, 5 V, 7.5 V, and 10 V options and

can be connected for

±5 V tracking outputs as shown in Figure

13. Again, an AD712 is used to buffer the reference input

terminals.

Figures 11, 12, and 13 show reference configurations for various

output ranges. As shown in Figure 11, the pin-programmable

AD588 can be connected to provides tracking

±5 V outputs

with 1-3ppm/

°C temperature stability. Buffer amplifiers are in-

cluded for direct connection to the AD569. The optional gain

and balance adjust trimmers allow bipolar offset and full-scale

errors to be nulled. In Figure 12, the low-cost AD586 provides