Analog Devices ADR512 Datasheet

1.2 V Precision Low Noise
Shunt Voltage Reference

ADR512

FEATURES
Precision 1.200 V Voltage Reference
Ultracompact 3 mm  3 mm SOT-23 Package
No External Capacitor Required
Low Output Noise: 4 V p-p (0.1 Hz to 10 Hz)
Initial Accuracy: 0.3% Max
Temperature Coefficient: 60 ppm/C Max
Operating Current Range: 100 A to 10 mA
Output Impedance: 0.3  Max
Temperature Range: –40C to +85C

APPLICATIONS
Precision Data Acquisition Systems
Battery-Powered Equipment:

Cellular Phone, Notebook Computer, PDA,

and GPS
3 V/5 V, 8-/12-Bit Data Converters
Portable Medical Instruments
Industrial Process Control Systems
Precision Instruments

GENERAL DESCRIPTION

Designed for space critical applications, the ADR512 is a low
voltage (1.200 V), precision shunt-mode voltage reference in the
ultracompact (3 mm ⫻ 3 mm) SOT-23 package. The ADR512
features low temperature drift (60 ppm/⬚C), high accuracy
(⫾0.30%), and ultralow noise (4 ␮V p-p) performance.

PIN CONFIGURATION

3-Lead SOT-23

ADR512

+

1

V

3

–

V

2

TRIM/NC

ADR512

Output Initial

Temperature

Voltage Accuracy Coefficient

Model (VO) (mV) (%) (ppm/C)

ADR512ART-REEL7 1.200 3.5 0.3 60

A TRIM terminal is available on the ADR512 to provide adjust­ment of the output voltage over ⫾0.5% without affecting the
temperature coefficient of the device. This feature provides
users with the flexibility to trim out any system errors.

The ADR512’s advanced design eliminates the need for an
external capacitor, yet it is stable with any capacitive load. The
minimum operating current increases from a scant 100 ␮A to a
maximum of 10 mA. This low operating current and ease of use
make the ADR512 ideally suited for handheld battery-powered
applications.

V

S

R

IL + I

ADR512

BIAS

Q

I

Q

I

Figure 1. Typical Operating Circuit

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. 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 companies.

L

V

= 1.2V

OUT

C

OUT

(OPTIONAL)

VS – V

R

BIAS

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] © 2003 Analog Devices, Inc. All rights reserved.

OUT

=

IL + I

Q

ADR512–SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

(IIN = 100 A to 10 mA @ TA = 25C, unless otherwise noted.)

Parameter Symbol Conditions Min Typ Max Unit

Output Voltage
Initial Accuracy V

Temperature Coefficient A Grade TCV
Output Voltage Change vs. I
Dynamic Output Impedence (∆V
Minimum Operating Current I
Voltage Noise e
Turn-On Settling Time
Output Voltage Hysteresis V

NOTES

1

The forward diode voltage characteristic at –1 mA is typically 0.65 V.

2

Measured without a load capacitor.

Specifications subject to change without notice.

ABSOLUTE MAXIMUM RATINGS*

Reverse Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 mA

Forward Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA

Storage Temperature Range

RT Package . . . . . . . . . . . . . . . . . . . . . . . . –65°C to +150°C

Operating Temperature Range . . . . . . . . . . . . –40°C to +85°C

Junction Temperature Range

1

IN

2

V

O

OERR

V

OERR%

O

∆V

R

/∆IR)IIN = 1 mA ±100 µA 0.3 Ω

R

IN

p-p f = 0.1 Hz to 10 Hz 4 µV p-p

N

t

R

O_HYS

–40°C < TA < +85°C60ppm/°C
IIN = 0.1 mA to 10 mA 3 mV

–40°C < TA < +85°C 100 µA

To within 0.1% of Output 10 µs

Package Type

1

1.1965 1.2 1.2035 V
–3.5 +3.5 mV
–0.3 +0.3 %

50 ppm

2



JA



JC

Unit

3-SOT-23 (RT) 230 146 °C/W

NOTES

1

Package power dissipation = (T

2

θJA is specified for worst-case conditions, i.e., θ

device soldered.

JMAX

– TA)/θJA.

is specified for

JA

RT Package . . . . . . . . . . . . . . . . . . . . . . . . –65°C to +150°C

Lead Temperature Range (Soldering, 60 Sec) . . . . . . . . 300°C

*Absolute maximum ratings apply at 25°C, unless otherwise noted. 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.

ORDERING GUIDE

Output Initial Temperature Number
Voltage Accuracy Coefficient Package Package of Parts Temperature

Model (VO)(mV) (%) (ppm/C) Description Option Branding per Reel Range

ADR512ART-REEL7 1.2 3.5 0.3 60 SOT-23 RT-3 RGA 3,000 –40°C to +85°C
ADR512ART-R2 1.2 3.5 0.3 60 SOT-23 RT-3 RGA 250 –40°C to +85°C

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although the
ADR512 features proprietary ESD protection circuitry, permanent damage may occur on devices
subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended
to avoid performance degradation or loss of functionality.

REV. 0–2–

1.204

1.203

Typical Performance Characteristics–ADR512

1.202

1.201

(V)

1.200

OUT

V

1.199

1.198

1.197

1.196

TPC 1. Typical V

–15–40 10 35 60 85

TEMPERATURE (C)

vs. Temperature

OUT

VIN = 2V/DIV

V

= 1V/DIV

OUT

V

OUT

TIME (400s/DIV)

TPC 4. Turn Off Time

V

VIN = 2V/DIV

= 1V/DIV

VIN = 2V/DIV

= 1V/DIV

OUT

TIME (100s/DIV)

TPC 2. Turn On Time

VIN = 2V/DIV

V

= 1V/DIV

OUT

TIME (100s/DIV)

TPC 3. Turn On Time with 1 µF Input Capacitor

TIME (200s/DIV)

TPC 5. Turn Off Time with 1 µF Input Capacitor

∆IIN = 100A

V

= 20mV/DIV

OUT

TIME (2s/DIV)

TPC 6. Output Response to 100 µA Input Current Change

REV. 0

–3–