AD586

Rev. G | Page 9 of 16

5V

50mV

1

µS

Figure 13. Large-Scale Transient Response

5V

1mV

2

µS

Figure 14. 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 AD586

by a long capacitive cable.

Figure 15 and Figure 16 display the output amplifier

characteristics driving a 1000 pF, 0 mA to 10 mA load.

AD586

5V

0V

1000pF

500

Ω

3.5V

Figure 15. Capacitive Load Transient Response Test Circuit

5V

200mV

1

µS

Figure 16. Output Response with Capacitive Load

LOAD REGULATION

The AD586 has excellent load regulation characteristics. Figure 17

shows that varying the load several mA changes the output by a

few µV. The AD586 has somewhat better load regulation per-

formance sourcing current than sinking current.

–6

–4

–2

24

68

10

LOAD (mA)

0

–500

–1000

500

1000

∆V

Figure 17. Typical Load Regulation Characteristics

TEMPERATURE PERFORMANCE

The AD586 is designed for precision reference applications

where temperature performance is critical. Extensive tempera-

ture testing ensures that the device maintains a high level of

performance over the operating temperature range.

Some confusion exists with defining and specifying reference

voltage error over temperature. Historically, references have

been characterized using a maximum deviation per degree

Celsius, that is, 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 measuring the output at

three or more different temperatures to specify an output volt-

age error band.