AD688SQ AD [Analog Devices], AD688SQ Datasheet - Page 7

• Manufacturer Part Number: AD688SQ
• Description: High Precision -+10 V Reference
• Manufacturer: AD [Analog Devices]

REV. A
Figure 11 displays the output amplifier characteristic driving a
5 mA-to-10 mA load, a common situation found when the
reference is shared among multiple converters or is used to
provide bipolar offset current.
Figure 11a. Transient and Constant Load Test Circuit
Figure 10c. Fine-Scale Settling for Transient Load
Figure 11b. Transient Response 5–10 mA Load
Figure 10b. Large-Scale Transient Response
–7–
In some applications, a varying load may be both resistive and
capacitive in nature, or be connected to the AD688 by a long
capacitive cable. Figure 12 displays the output amplifier charac-
teristics driving a 1,000 pF, 0-to-10 mA load.
Figure 12a. Capacitive Load Transient Response Test
Circuit
Figure 13 displays the crosstalk between output amplifiers. The
top trace shows the output of A4, dc-coupled and offset by 10
volts, while the output of A3 is subjected to a 0-to-10 mA load
current step. The transient at A4 settles in about 1 s, and the
load-induced offset is about 100 V.
Figure 12b. Output Response with Capacitive Load
Figure 13a. Load Crosstalk Test Circuit
Figure 13b. Load Crosstalk
AD688