Ultralow Noise, LDO XFET Voltage

References with Current Sink and Source

ADR440/ADR441/ADR443/ADR444/ADR445

Rev. E

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FEATURES

Ultralow noise (0.1 Hz to 10 Hz)

ADR440: 1 μV p-p

ADR441: 1.2 μV p-p

ADR443: 1.4 μV p-p

ADR444: 1.8 μV p-p

ADR445: 2.25 μV p-p

Superb temperature coefficient

A grade: 10 ppm/°C

B grade: 3 ppm/°C

Low dropout operation: 500 mV

High output source and sink current

+10 mA and −5 mA, respectively

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

APPLICATIONS

Precision data acquisition systems

High resolution data converters

Battery-powered instrumentation

Portable medical instruments

Industrial process control systems

Precision instruments

Optical control circuits

PIN CONFIGURATIONS

NOTES

1. NC = NO CONNECT

2. TP = TEST PIN (DO NOT CONNECT)

TP

1

NC

3

GND

4

TP

8

NC

7

6

TRIM

5

ADR440/

ADR441/

ADR443/

ADR444/

ADR445

TOP VIEW

(Not to Scale)

Figure 1. 8-Lead SOIC_N (R-Suffix)

NC

3

GND

4

TP

8

NC

7

6

TRIM

5

ADR440/

ADR441/

ADR443/

ADR444/

ADR445

TOP VIEW

(Not to Scale)

NOTES

1. NC = NO CONNECT

2. TP = TEST PIN (DO NOT CONNECT)

Figure 2. 8-Lead MSOP (RM-Suffix)

GENERAL DESCRIPTION

The ADR44x series is a family of XFET® voltage references

featuring ultralow noise, high accuracy, and low temperature

drift performance. Using Analog Devices, Inc., patented

temperature drift curvature correction and XFET (eXtra

implanted junction FET) technology, voltage change vs.

temperature nonlinearity in the ADR44x is greatly minimized.

The XFET references offer better noise performance than

buried Zener references, and XFET references operate off

low supply voltage headroom (0.5 V). This combination of

features makes the ADR44x family ideally suited for precision

signal conversion applications in high-end data acquisition

systems, optical networks, and medical applications.

The ADR44x family has the capability to source up to 10 mA of

output current and sink up to −5 mA. It also comes with a trim

terminal to adjust the output voltage over a 0.5% range without

compromising performance.

Offered in two electrical grades, the ADR44x family is avail-

able in 8-lead MSOP and narrow SOIC packages. All versions

are specified over the extended industrial temperature range of

−40°C to +125°C.

Table 1. Selection Guide

Model

Output

Voltage

(V)

Initial

Accuracy

(mV)

Temperature

Coefficient

(ppm/°C)

ADR440A

2.048

±3

10

ADR440B

2.048

±1

3

ADR441A

2.500

±3

10

ADR441B

2.500

±1

3

ADR443A

3.000

±4

10

ADR443B

3.000

±1.2

3

ADR444A

4.096

±5

10

ADR444B

4.096

±1.6

3

ADR445A

5.000

±6

10

ADR445B

5.000

±2

3