Ultralow Noise, High Accuracy

Voltage References

Data Sheet

ADR4520/ADR4525/ADR4530/ADR4533/ADR4540/ADR4550

Rev. D

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FEATURES

0.8 ppm/°C (D grade 0°C to 70°C)

1 ppm/°C (C grade 0°C to 70°C)

2 ppm/°C (B grade −40°C to +125°C)

4 ppm/°C (A grade −40°C to +125°C)

Output noise (0.1 Hz to 10 Hz):

Initial output voltage error:

B, C, D grade: ±0.02% (maximum)

Input voltage range: 3 V to 15 V

Operating temperature:

A grade and B grade: −40°C to +125°C

C grade and D grade: 0°C to +70°C

Output current: +10 mA source/−10 mA sink

Low quiescent current: 950 μA (maximum)

8-lead SOIC and LCC package

AEC-Q100 qualified for automotive applications

Long-term drift: 8 ppm typical at 4500 hours

APPLICATIONS

Precision data acquisition systems

High resolution data converters

High precision measurement devices

Industrial instrumentation

Medical devices

Automotive battery monitoring

GENERAL DESCRIPTION

The ADR4520/ADR4525/ADR4530/ADR4533/ADR4540/

ADR4550 devices are high precision, low power, low noise

voltage references featuring ±0.02% B, C, and D grade

maximum initial error, excellent temperature stability, and low

output noise.

This family of voltage references uses an innovative core topology

to achieve high accuracy while offering industry-leading

temperature stability and noise performance. The low, thermally

induced output voltage hysteresis and low long-term output

voltage drift of the devices also improve system accuracy over

time and temperature variations.

A maximum operating current of 950 μA and a maximum low

dropout voltage of 300 mV allow the devices to function very

well in portable equipment.

The ADR4520/ADR4525/ADR4530/ADR4533/ADR4540/

ADR4550 series of references are each provided in an 8-lead

SOIC and are available in a wide range of output voltages, all of

which are specified over the extended industrial temperature

range of −40°C to +125°C.

PIN CONFIGURATIONS

DNC

8

NIC

7

6

NIC

5

NOTES

1. NIC = NOT INTERNALLY CONNECTED.

THIS PIN IS NOT CONNECTED INTERNALLY.

2. DNC = DO NOT CONNECT. DO NOT CONNECT TO THIS PIN.

ADR4520/ADR4525/

ADR4530/ADR4533/

ADR4540/ADR4550

TOP VIEW

(Not to Scale)

Figure 1. 8-Lead SOIC Pin Configuration

1

2

3

7

6

5

8

4

NOTES

1. NIC = NOT INTERNALLY CONNECTED.

THIS PIN IS NOT CONNECTED INTERNALLY.

2. DNC = DO NOT CONNECT. DO NOT CONNECT TO THIS PIN.

DNC

N I C

DNC

ADR4520/ADR4525/

ADR4530/ADR4533/

ADR4540/ADR4550

Figure 2. 8-Lead LCC Pin Configuration

The ADR4525, ADR4540, and ADR4550 are also available in D,

which are in 8 lead LCC package, and C grade with a temperature

range of 0°C to 70°C. The ADR4525W, available in an 8-lead

SOIC package, is qualified for automotive applications.

Table 1. Selection Guide

Model

Output Voltage (V)

Grade

ADR4520

2.048

A, B

ADR4525

2.5

A, B, C, D

ADR4525W

2.5

B

ADR4530

3.0

A, B

ADR4533

3.3

A, B

ADR4540

4.096

A, B, C, D

ADR4550

5.0

A, B, C, D

Table 2. Voltage Reference Choices from Analog Devices, Inc.

Micropower

Low Power

Ultralow Noise

2.048

ADR3420

ADR360

ADR440

LT6656

LTC6652

LTC6655

LT6654

2.5

ADR3425

ADR361

ADR441

LT1461

LTC6652

LTC6655

LT6656

LT6654

5.0

ADR3450

ADR365

ADR445

LT1461

LTC6652

LTC6655

LT6656

LT6654