1.25 V Micropower, Precision Shunt

Voltage Reference

ADR1581

Rev. 0

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PIN CONFIGURATION

FEATURES

Wide operating range: 60 μA to 10 mA

NC = NO CONNECT

TOP VIEW

NC (OR V–)

3

ADR1581

Initial accuracy: ±0.12% maximum

Temperature drift: ±50 ppm/°C maximum

Output impedance: 0.5 Ω maximum

Wideband noise (10 Hz to 10 kHz): 20 μV rms

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

High ESD rating

Figure 1. SOT-23

4 kV human body model

0

2

4

6

8

10

12

14

16

18

20

TEMPERATURE DRIFT (ppm/°C)

–20

–10

0

10

20

400 V machine model

Compact, surface-mount SOT-23 package

APPLICATIONS

Portable, battery-powered equipment

Cellular phones, notebook computers, PDAs, GPSs,

and DMMs

Computer workstations

Suitable for use with a wide range of video RAMDACs

Smart industrial transmitters

PCMCIA cards

Automotive

3 V/5 V, 8-bit to 12-bit data converters

GENERAL DESCRIPTION

Figure 2. Reverse Voltage Temperature Drift Distribution

The ADR15811 is a low cost, 2-terminal (shunt), precision band

gap reference. It provides an accurate 1.250 V output for input

currents between 60 μA and 10 mA.

0

10

20

30

40

50

60

70

80

90

100

OUTPUT ERROR (mV)

–5

–4

–3

–2

–1

0

1

2

3

4

5

The superior accuracy and stability of the ADR1581 is made

possible by the precise matching and thermal tracking of on-

chip components. Proprietary curvature correction design

techniques have been used to minimize the nonlinearities in

the voltage output temperature characteristics. The ADR1581

is stable with any value of capacitive load.

The low minimum operating current makes the ADR1581 ideal

for use in battery-powered 3 V or 5 V systems. However, the wide

operating current range means that the ADR1581 is extremely

versatile and suitable for use in a wide variety of high current

applications.

Figure 3. Reverse Voltage Error Distribution

The ADR1581 is available in two grades, A and B, both of which

are provided in the SOT-23 package. Both grades are specified

over the industrial temperature range of −40°C to +85°C.