ADR1581ARTZ-REEL7 datasheet, PDF

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1.25 V Micropower, Precision Shunt

Voltage Reference

ADR1581

FEATURES

Wide operating range: 60 μA to 10 mA

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

4 kV human body model

400 V machine model

Compact, surface-mount SOT-23 package

PIN CONFIGURATION

V+

1

ADR1581

3

NC (OR V–)

V–

2

NC = NO CONNECT

06672-001

TOP VIEW

Figure 1. SOT-23

20

18

16

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

QUANTITY

14

12

10

8

6

4

2

–10

0

10

TEMPERATURE DRIFT (ppm/°C)

20

06672-002

0

–20

GENERAL DESCRIPTION

The ADR1581

1

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.

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.

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.

1

Figure 2. Reverse Voltage Temperature Drift Distribution

100

90

80

70

QUANTITY

60

50

40

30

20

10

–5

–4

–3

–2

–1

0

1

2

OUTPUT ERROR (mV)

3

4

5

06672-003

0

Figure 3. Reverse Voltage Error Distribution

Protected by U.S. Patent No. 5,969,657.

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

www.analog.com

Fax: 781.461.3113

ADR1581

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

General Description ......................................................................... 1

Pin Configuration............................................................................. 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

Absolute Maximum Ratings............................................................ 4

ESD Caution.................................................................................. 4

Typical Performance Characteristics ............................................. 5

Theory of Operation ........................................................................ 6

Applying the ADR1581................................................................ 6

Temperature Performance............................................................6

Voltage Output Nonlinearity vs. Temperature ..........................7

Reverse Voltage Hysteresis...........................................................7

Output Impedance vs. Frequency ...............................................8

Noise Performance and Reduction .............................................8

Turn-On Time ...............................................................................8

Transient Response .......................................................................9

Precision Micropower Low Dropout Reference .......................9

Using the ADR1581 with 3 V Data Converters ..................... 10

Outline Dimensions ....................................................................... 11

Ordering Guide .......................................................................... 12

REVISION HISTORY

5/07—Revision 0: Initial Version

Rev. 0 | Page 2 of 12

ADR1581

SPECIFICATIONS

T

A

= 25°C, I

IN

= 100 μA, unless otherwise noted.

Table 1.

Parameter

REVERSE VOLTAGE OUTPUT (SOT-23)

REVERSE VOLTAGE TEMPERATURE DRIFT

−40°C to +85°C

MINIMUM OPERATING CURRENT, T

MIN

to T

MAX

REVERSE VOLTAGE CHANGE WITH REVERSE CURRENT

60 μA < I

IN

< 10 mA, T

MIN

to T

MAX

60 μA < I

IN

< 1 mA, T

MIN

to T

MAX

DYNAMIC OUTPUT IMPEDANCE (∆V

R

/ΔI

R

)

I

IN

= 1 mA ± 100 μA (f = 120 Hz)

OUTPUT NOISE

RMS Noise Voltage: 10 Hz to 10 kHz

Low Frequency Noise Voltage: 0.1 Hz to 10 Hz

TURN-ON SETTLING TIME TO 0.1%

1

OUTPUT VOLTAGE HYSTERESIS

2

TEMPERATURE RANGE

Specified Performance, T

MIN

to T

MAX

Operating Range

3

1

2

Min

1.240

ADR1581A

Typ

Max

1.250

1.260

100

60

2.5

0.8

0.4

20

4.5

5

80

6

Min

1.2485

ADR1581B

Typ

Max

1.250

1.2515

50

60

2.5

0.8

0.4

20

4.5

5

80

6

Unit

V

ppm/°C

μA

mV

Ω

μV rms

μV p-p

μs

μV

1

0.5

−40

−55

+85

+125

−40

−55

+85

+125

°C

Measured with a no load capacitor.

Output hysteresis is defined as the change in the +25°C output voltage after a temperature excursion to −40°C, then to +85°C, and back to +25°C.

3

The operating temperature range is defined as the temperature extremes at which the device continues to function. Parts may deviate from their specified

performance.

Rev. 0 | Page 3 of 12

ADR1581

ABSOLUTE MAXIMUM RATINGS

Table 2.

Parameter

Reverse Current

Forward Current

Internal Power Dissipation

1

SOT-23 (RT)

Storage Temperature Range

Operating Temperature Range

ADR1581/RT

Lead Temperature, Soldering

Vapor Phase (60 sec)

Infrared (15 sec)

ESD Susceptibility

2

Human Body Model

Machine Model

1

2

Rating

25 mA

20 mA

0.3 W

−65°C to +150°C

−55°C to +125°C

215°C

220°C

4 kV

400 V

Stresses above those listed under Absolute Maximum Ratings

may cause permanent damage to the device. This is a stress

rating only; functional operation of the device at these or any

other conditions above those indicated in the operational

section of this specification is not implied. Exposure to absolute

maximum rating conditions for extended periods may affect

device reliability.

ESD CAUTION

Specification is for device (SOT-23 package) in free air at 25°C: θ

JA

= 300°C/W.

The human body model is a 100 pF capacitor discharged through 1.5 kΩ. For

the machine model, a 200 pF capacitor is discharged directly into the device.

Rev. 0 | Page 4 of 12

ADR1581

TYPICAL PERFORMANCE CHARACTERISTICS

2000

1500

80

100

REVERSE VOLTAGE CHANGE (ppm)

1000

20ppm/°C

500

0

5ppm/°C

–500

–1000

REVERSE CURRENT (µA)

60

40

+125°C

–40°C

20

+25°C

06672-004

–35

–15

5

25

45

65

TEMPERATURE (°C)

85

105

125

0

0.2

0.4

0.6

0.8

1.0

REVERSE VOLTAGE (V)

1.2

1.4

Figure 4. Output Drift for Different Temperature Characteristics

Figure 7. Reverse Current vs. Reverse Voltage

7

6

1

–40°C

0.8

FORWARD VOLTAGE (µA)

REVERSE VOLTAGE CHANGE (mV)

5

4

3

2

1

0

06672-005

+85°C

0.6

+25°C

+85°C

0.4

+25°C

–40°C

0.2

0.10

1.00

REVERSE CURRENT (mA)

10

0.1

1

10

FORWARD CURRENT (mA)

100

Figure 5. Output Voltage Error vs. Reverse Current

Figure 8. Forward Voltage vs. Forward Current

600

NOISE VOLTAGE (nV/ Hz)

400

200

1.0

10

100

1k

10k

100k

1M

FREQUENCY (Hz)

Figure 6. Noise Spectral Density

06672-006

Rev. 0 | Page 5 of 12

06672-008

–1

0.01

0

0.01

06672-007

–1500

–55

0

Parameter Name	Attribute value
EU restricts the use of certain hazardous substances	Compliant
ECCN (US)	EAR99
Part Status	Active
HTS	8542.39.00.01
Reference Type	Precision
Topology	Shunt
Initial Accuracy	0.12%
Maximum Temperature Coefficient	100ppm/°C
Load Regulation	6mV
Output Voltage (V)	1.25
Maximum Output Current (mA)	10
Minimum Operating Temperature (°C)	-40
Maximum Operating Temperature (°C)	85
Supplier Temperature Grade	Industrial
Packaging	Tape and Reel
Pin Count	3
Standard Package Name	SOT
Supplier Package	SOT-23
Mounting	Surface Mount
Package Height	0.95
Package Length	2.9
Package Width	1.3
PCB changed	3
Lead Shape	Gull-wing

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