High Precision Shunt Mode

Voltage References

ADR520/ADR525/ADR530/ADR540/ADR550

Rev. E

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FEATURES

Ultracompact SC70 and SOT-23-3 packages

Temperature coefficient: 40 ppm/°C (maximum)

2× the temperature coefficient improvement over the

LM4040

Pin compatible with the LM4040/LM4050

Initial accuracy: ±0.2%

Low output voltage noise: 14 μV p-p @ 2.5 V output

No external capacitor required

Operating current range: 50 μA to 15 mA

Industrial temperature range: −40°C to +85°C

APPLICATIONS

Portable, battery-powered equipment

Automotive

Power supplies

Data acquisition systems

Instrumentation and process control

Energy measurement

Table 1. Selection Guide

Part

Voltage (V)

Initial

Accuracy (%)

Temperature

Coefficient

(ppm/°C)

ADR520A

2.048

±0.4

70

ADR520B

2.048

±0.2

40

ADR525A

2.5

±0.4

70

ADR525B

2.5

±0.2

40

ADR530A

3.0

±0.4

70

ADR530B

3.0

±0.2

40

ADR540A

4.096

±0.4

70

ADR540B

4.096

±0.2

40

ADR550A

5.0

±0.4

70

ADR550B

5.0

±0.2

40

PIN CONFIGURATION

ADR520/

ADR525/

ADR530/

ADR540/

ADR550

TRIM

3

Figure 1. 3-Lead SC70 (KS) and 3-Lead SOT-23-3 (RT)

GENERAL DESCRIPTION

Designed for space-critical applications, the ADR520/ADR525/

ADR530/ADR540/ADR550 are high precision shunt voltage

references, housed in ultrasmall SC70 and SOT-23-3 packages.

These references feature low temperature drift of 40 ppm/°C,

an initial accuracy of better than ±0.2%, and ultralow output

noise of 14 μV p-p.

Available in output voltages of 2.048 V, 2.5 V, 3.0 V, 4.096 V,

and 5.0 V, the advanced design of the ADR520/ADR525/

ADR530/ADR540/ADR550 eliminates the need for compensa-

tion by an external capacitor, yet the references are stable with

any capacitive load. The minimum operating current increases

from a mere 50 μA to a maximum of 15 mA. This low operating

current and ease of use make these references ideally suited for

handheld, battery-powered applications.

A trim terminal is available on the ADR520/ADR525/ADR530/

ADR540/ADR550 to allow adjustment of the output voltage

over a ±0.5% range, without affecting the temperature coefficient

of the device. This feature provides users with the flexibility to

trim out any system errors.