with Current Sink and Source Capability

ADR430/ADR431/ADR433/ADR434/ADR435/ADR439

Rev. B

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© 2004 Analog Devices, Inc. All rights reserved.

FEATURES

Low noise (0.1 Hz to 10 Hz): 3.5 µV p-p @ 2.5 V output

No external capacitor required

Low temperature coefficient

A Grade: 10 ppm/°C max

B Grade: 3 ppm/°C max

Load regulation: 15 ppm/mA

Line regulation: 20 ppm/V

Wide operating range

ADR430: 4.1 V to 18 V

ADR431: 4.5 V to 18 V

ADR433: 5.0 V to 18 V

ADR434: 6.1 V to 18 V

ADR435: 7.0 V to 18 V

ADR439: 6.5 V to 18 V

High output current: +30 mA/−20 mA

Wide temperature range: −40°C to +125°C

APPLICATIONS

Precision data acquisition systems

High resolution data converters

Medical instruments

Industrial process control systems

Optical control circuits

Precision instruments

PIN CONFIGURATIONS

NC = NO CONNECT

ADR43x

TOP VIEW

(Not to Scale)

TP

NC

TRIM

8

7

6

5

Figure 1. 8-Lead MSOP

(RM Suffix)

NC = NO CONNECT

ADR43x

TOP VIEW

(Not to Scale)

TP

NC

TRIM

8

7

6

5

Figure 2. 8-Lead SOIC

(R Suffix)

GENERAL DESCRIPTION

The ADR43x series is a family of XFET voltage references

featuring low noise, high accuracy, and low temperature drift

performance. Using ADI’s patented temperature drift curvature

correction and XFET (eXtra implanted junction FET) technology,

the ADR43x’s voltage change versus temperature nonlinearity is

minimized.

The XFET references operate at lower current (800 µA) and

supply headroom (2 V) than buried-Zener references. Buried-

Zener references require more than 5 V headroom for operations.

The ADR43x XFET references are the only low noise solutions

for 5 V systems.

The ADR43x series has the capability to source up to 30 mA

and sink up to 20 mA of output current. It also comes with a

TRIM terminal to adjust the output voltage over a 0.5% range

without compromising performance. The ADR43x is available

in the 8-lead mini SOIC and 8-lead SOIC packages.

All versions are specified over the extended industrial tempera-

ture range (−40°C to +125°C).

Table 1. Selection Guide

Model

Accuracy

(mV)

Temperature Coefficient

(ppm/°C)

ADR430B

2.048

±1

3

ADR430A

2.048

±3

10

ADR431B

2.500

±1

3

ADR431A

2.500

±3

10

ADR433B

3.000

±1.4

3

ADR433A

3.000

±4

10

ADR434B

4.096

±1.5

3

ADR434A

4.096

±5

10

ADR435B

5.000

±2

3

ADR435A

5.000

±6

10

ADR439B

4.500

±2

3

ADR439A

4.500

±5.4

10