AD587

Rev. H | Page 8 of 12

100

90

10

0%

1mV

2µs

10V

Figure 12. Fine-Scale Setting for Transient Load

In some applications, a varying load may be both resistive and

capacitive in nature, or the load may be connected to the

AD587 by a long capacitive cable.

Figure 14 displays the output amplifier characteristics driving a

1000 pF, 0 mA to 10 mA load.

AD587

7.0V

1kΩ

10V

0V

1000pF

Figure 13. Capacitive Load Transient/Response Test Circuit

100

90

10

0%

200mV

1µs

10V

Figure 14. Output Response with Capacitive Load

LOAD REGULATION

The AD587 has excellent load regulation characteristics.

Figure 15 shows that varying the load several milliamperes

changes the output by only a few microvolts.

–6

–4

–2

0

–500

–1000

500

1000

LOAD (mA)

24

6

8

10

Figure 15. Typical Load Regulation Characteristics

TEMPERATURE PERFORMANCE

The AD587 is designed for precision reference applications

where temperature performance is critical. Extensive tempera-

ture testing ensures that the device’s high level of performance is

maintained over the operating temperature range.

Some confusion exists in the area of defining and specifying

reference voltage error over temperature. Historically, references

have been characterized using a maximum deviation per degree

Celsius, such as ppm/°C. However, because of nonlinearities in

temperature characteristics that originated in standard Zener

references (such as S-type characteristics), most manufacturers

have begun to use a maximum limit error-band approach to

specify devices. This technique involves the measurement of the

output at three or more temperatures to specify an output

voltage error band.