ADA4000-1(RevB) Ver la hoja de datos (PDF) - Analog Devices

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Fabricante

ADA4000-1
(Rev.:RevB)

Low Cost, Precision JFET Input Operational Amplifiers

Analog Devices 

Data Sheet

ADA4000-1/ADA4000-2/ADA4000-4

SETTLING TIME

Settling time is the amount of time it takes the amplifier output

to reach and remain within a percentage of the final value. This

is an important parameter in data acquisition systems. Because

most bipolar DAC converters have current output, an external

operational amplifier is required to convert the current to voltage.

Therefore, the amplifier settling time plays a role in the total

settling time of the output signal. A good approximation for the

total settling time is

tS Total  (tS DAC)2  (tS AMP)2

The ADA4000-1/ADA4000-2/ADA4000-4 settle to within 0.1%

of their final value in less than 1.2 μs. The settling time has been

tested by using the configuration circuit in Figure 34.

The input signal is a 10 V pulse and the output is the error

signal for the settling time shown in Figure 33.

+15V

10V p-p

3

V+

0

ADA4000-1 1 10kΩ

10kΩ 2

V–

V1

–15V

10kΩ

10kΩ

5V/DIV

200mV/DIV

200ns/DIV

Figure 33. Settling Time Measurement Using the False Summing Node Method

+15V

8

V+

AD828

V–

4

–15V

20kΩ

1kΩ

VOUT

Figure 34. Settling Time Test Circuit

Rev. B | Page 11 of 16

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