AD588KQ Просмотр технического описания (PDF) - Analog Devices

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AD588KQ

High Precision Voltage Reference

Analog Devices 

AD588

Unity Gain Follower Pulse Response (Large Signal)

Figure 9. Advantage of Kelvin Connection

In such cases, the unused amplifier should be connected as a

unity-gain follower (force + sense pin tied together) and the

input should be connected to ground.

An unused amplifier section may be used for other circuit func-

tions as well. The curves on this page show the typical perfor-

mance of A3 and A4.

Unity Gain Follower Pulse Response (Small Signal)

DYNAMIC PERFORMANCE

The output buffer amplifiers (A3 and A4) are designed to

provide the AD588 with static and dynamic load regulation

superior to less complete references.

Many A/D and D/A converters present transient current loads

to the reference, and poor reference response can degrade the

converter’s performance.

Figure 10 displays the characteristics of the AD588 output

amplifier driving a 0 mA to 10 mA load.

Figure 10a. Transient Load Test Circuit

Common-Mode Rejection vs. Frequency (A3, A4)

Input Noise Voltage Spectral Density

REV. B

–7–

Figure 10b. Large-Scale Transient Response

NOISE

REDUCTION

7

VHIGH

6

A3 IN

4

A3 OUT

SENSE

3

RB

A1

R1

R4

R2

R5

A3

1 A3 OUT

FORCE

14 A4 OUT

SENSE

A4

15

A4 OUT

FORCE

R3

5

GAIN

ADJ

A2

9

GND

SENSE

+IN

10

GND

SENSE

–IN

8

VLOW

R6

2

AD588

16

12

BAL

ADJ

11

VCT

13

A4 IN

+VS

–VS

Figure 10c. Fine Scale Settling for Transient Load

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