Analog Devices AD1582 3 4 5 d Datasheet

2.5 V to 5.0 V Micropower, Precision

a

AD1582/AD1583/AD1584/AD1585

FEATURES
Series Reference (2.5 V, 3 V, 4.096 V, 5 V)
Low Quiescent Current: 70 A max
Current Output Capability: 5 mA
Wide Supply Range: V

IN

= V
Wideband Noise (10 Hz to 10 kHz): 50 V rms
Specified Temperature Range: –40C to +125C
Compact, Surface-Mount SOT-23 Package

AD158x Products, Three Electrical Grades

Electrical Tempco
Grade Initial Accuracy (ppmC)

AD1582 AD1583/AD1585 AD1584

B 0.08% 0.10% 0.10% 50
C 0.16% 0.20% 0.20% 50
A 0.80% 1.00% 0.98% 100

GENERAL DESCRIPTION

The AD1582, AD1583, AD1584, and AD1585 are a family of low
cost, low power, low dropout, precision band gap references.
These designs are available as three-terminal (series) devices
and are packaged in the compact SOT-23, 3-lead surface-mount
package. The versatility of these references makes them ideal for
use in battery-powered 3 V or 5 V systems where there may be
wide variations in supply voltage and a need to minimize power
dissipation.

The superior accuracy and temperature stability of the AD1582/
AD1583/AD1584/AD1585 is made possible by the precise
matching and thermal tracking of on-chip components. Patented
temperature drift curvature correction design techniques minimize
the nonlinearities in the voltage output temperature characteristic.

These series mode devices (AD1582/AD1583/AD1584/AD1585)
source or sink up to 5 mA of load current and operate efficiently
with only 200 mV of required headroom supply. This family
draws a maximum 70 µA of quiescent current with only a 1.0 µA/V
variation with supply voltage. The advantage of these designs
over conventional shunt devices is extraordinary. Valuable supply
current is no longer wasted through an input series resistor, and
maximum power efficiency is achieved at all input voltage levels.

The AD1582, AD1583, AD1584, and AD1585 are available in
three grades, A, B, and C, and are provided in a tiny footprint,
the SOT-23. All grades are specified over the industrial tem­perature range of –40°C to +125°C.

+ 200 mV to 12 V

OUT

Series Mode Voltage References

FUNCTIONAL BLOCK DIAGRAM

3-Lead SOT-23

(RT Suffix)

1

V

OUT

GND

TARGET APPLICATIONS

1. Portable, battery-powered equipment, e.g., notebook comput­ers, cellular phones, pagers, PDAs, GPSs, and DMMs.

2. Computer workstations. Suitable for use with a wide range of
video RAMDACs.

3. Smart industrial transmitters

4. PCMCIA cards

5. Automotive

6. Hard disk drives

7. 3 V/5 V, 8-bit/12-bit data converters

900

800

700

600

500

(A)

400

SUPPLY

I

300

200

100

0

2.7 5

Figure 1. Supply Current (µA) vs. Supply Voltage (V)

AD1582/
AD1583/
AD1584/
AD1585

TOP VIEW

2

SHUNT REFERENCE

AD1582 SERIES REFERENCE

V

SUPPLY

*

3

V

IN

*

(V)

3.076k SOURCE RESISTOR

REV. D

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 owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] © 2004 Analog Devices, Inc. All rights reserved.

AD1582/AD1583/AD1584/AD1585

AD1582–SPECIFICATIONS

(@ TA = T

MIN to TMAX

, VIN = 5 V, unless otherwise noted.)

AD1582A AD1582B AD1582C

Parameter Min Typ Max Min Typ Max Min Typ Max Unit

OUTPUT VOLTAGE (@ 25°C)

V

O

2.480 2.500 2.520 2.498 2.500 2.502 2.496 2.500 2.504 V

INITIAL ACCURACY ERROR (@ 25°C)

V

OERR

–20 +20 –2 +2 –4 +4 mV
–0.80 +0.80 –0.08 +0.08 –0.16 +0.16 %

OUTPUT VOLTAGE TEMPERATURE DRIFT 100 50 50 ppm/°C

TEMPERATURE COEFFICIENT (TCV

–40°C < T

< +125°C40100 18 50 18 50 ppm/°C

A

)

O

0°C < TA < 70°C351515ppm/°C

MINIMUM SUPPLY HEADROOM (VIN–V

) 200 200 200 mV

OUT

LOAD REGULATION

0 mA < I
0 mA < I
–5 mA < I
–5 mA < I
–0.1 mA < I
–0.1 mA < I

< 5 mA (–40°C to +85°C) 0.2 0.2 0.2 mV/mA

OUT

< 5 mA (–40°C to +125°C) 0.4 0.4 0.4 mV/mA

OUT

< 0 mA (–40°C to +85°C) 0.25 0.25 0.25 mV/mA

OUT

< 0 mA (–40°C to +125°C) 0.45 0.45 0.45 mV/mA

OUT

< +0.1 mA (–40°C to +85°C) 2.7 2.7 2.7 mV/mA

OUT

< +0.1 mA (–40°C to +125°C) 3.5 3.5 3.5 mV/mA

OUT

LINE REGULATION

V

200 mV < VIN < 12 V

OUT

I

= 0 mA 25 25 25 µV/V

OUT

RIPPLE REJECTION (∆V

OUT

/∆VIN)

VIN = 5 V ± 100 mV (f = 120 Hz) 80 80 80 dB

QUIESCENT CURRENT 70 70 70 µA

SHORT-CIRCUIT CURRENT TO GROUND 15 15 15 mA

NOISE VOLTAGE (@ 25°C)

0.1 Hz to 10 Hz 70 70 70 µV p-p
10 Hz to 10 kHz 50 50 50 µV rms

TURN-ON SETTLING TIME TO 0.1%,

CL = 0.2 µF 100 100 100 µs

LONG-TERM STABILITY

1000 Hours @ 25°C 100 100 100 ppm/1000 hrs.

OUTPUT VOLTAGE HYSTERESIS 115 115 115 ppm

TEMPERATURE RANGE

Specified Performance (A, B, C) –40 +125 –40 +125 –40 +125 °C
Operating Performance (A, B, C) –55 +125 –55 +125 –55 +125 °C

Specifications subject to change without notice.

–2–

REV. D

AD1582/AD1583/AD1584/AD1585

AD1583–SPECIFICATIONS

(@ TA = T

MIN

to T

, VIN = 5 V, unless otherwise noted.)

MAX

AD1583A AD1583B AD1583C

Parameter Min Typ Max Min Typ Max Min Typ Max Unit

OUTPUT VOLTAGE (@ 25°C)

V

O

2.970 3.000 3.030 2.997 3.000 3.003 2.994 3.000 3.006 V

INITIAL ACCURACY ERROR (@ 25°C)

V

OERR

–30 +30 –3 +3 –6 +6 mV
–1.0 +1.0 –0.1 +0.1 –0.20 +0.20 %

OUTPUT VOLTAGE TEMPERATURE DRIFT 100 50 50 ppm/°C

TEMPERATURE COEFFICIENT (TCVO)

–40°C < TA < +125°C40100 18 50 18 50 ppm/°C
0°C < TA < 70°C351515ppm/°C

MINIMUM SUPPLY HEADROOM (VIN–V

) 200 200 200 mV

OUT

LOAD REGULATION

0 mA < I
0 mA < I
–5 mA < I
–5 mA < I
–0.1 mA < I
–0.1 mA < I

< 5 mA (–40°C to +85°C) 0.25 0.25 0.25 mV/mA

OUT

< 5 mA (–40°C to +125°C) 0.45 0.45 0.45 mV/mA

OUT

< 0 mA (–40°C to +85°C) 0.40 0.40 0.40 mV/mA

OUT

< 0 mA (–40°C to +125°C) 0.6 0.6 0.6 mV/mA

OUT

< +0.1 mA (–40°C to +85°C) 2.9 2.9 2.9 mV/mA

OUT

< +0.1 mA (–40°C to +125°C) 3.7 3.7 3.7 mV/mA

OUT

LINE REGULATION

V

200 mV < VIN < 12 V

OUT

I

= 0 mA 25 25 25 µV/V

OUT

RIPPLE REJECTION (∆V

OUT

/∆VIN)

VIN = 5 V ± 100 mV (f = 120 Hz) 80 80 80 dB

QUIESCENT CURRENT 70 70 70 µA

SHORT-CIRCUIT CURRENT TO GROUND 15 15 15 mA

NOISE VOLTAGE (@ 25°C)

0.1 Hz to 10 Hz 85 85 85 µV p-p
10 Hz to 10 kHz 60 60 60 µV rms

TURN-ON SETTLING TIME TO 0.1%

CL = 0.2 µF 120 120 120 µs

LONG-TERM STABILITY

1000 Hours @ 25°C 100 100 100 ppm/1000 hrs.

OUTPUT VOLTAGE HYSTERESIS 115 115 115 ppm

TEMPERATURE RANGE

Specified Performance (A, B, C) –40 +125 –40 +125 –40 +125 °C
Operating Performance (A, B, C) –55 +125 –55 +125 –55 +125 °C

Specifications subject to change without notice.

REV. D

–3–

AD1582/AD1583/AD1584/AD1585
AD1584–SPECIFICATIONS

(@ TA = T

MIN

to T

, VIN = 5 V, unless otherwise noted.)

MAX

AD1584A AD1584B AD1584C

Parameter Min Typ Max Min Typ Max Min Typ Max Unit

OUTPUT VOLTAGE (@ 25°C)

V

O

4.056 4.096 4.136 4.092 4.096 4.100 4.088 4.096 4.104 V

INITIAL ACCURACY ERROR (@ 25°C)

V

OERR

–40 +40 –4 +4 –8 +8 mV
–0.98 +0.98 –0.1 +0.1 –0.2 +0.2 %

OUTPUT VOLTAGE TEMPERATURE DRIFT 100 50 50 ppm/°C

TEMPERATURE COEFFICIENT (TCV

–40°C < T

< +125°C40100 18 50 18 50 ppm/°C

A

)

O

0°C < TA < 70°C351515ppm/°C

MINIMUM SUPPLY HEADROOM (VIN–V

) 200 200 200 mV

OUT

LOAD REGULATION

0 mA < I
0 mA < I
–5 mA < I
–5 mA < I
–0.1 mA < I
–0.1 mA < I

< 5 mA (–40°C to +85°C) 0.32 0.32 0.32 mV/mA

OUT

< 5 mA (–40°C to +125°C) 0.52 0.52 0.52 mV/mA

OUT

< 0 mA (–40°C to +85°C) 0.40 0.40 0.40 mV/mA

OUT

< 0 mA (–40°C to +125°C) 0.6 0.6 0.6 mV/mA

OUT

< +0.1 mA (–40°C to +85°C) 3.2 3.2 3.2 mV/mA

OUT

< +0.1 mA (–40°C to +125°C) 4.1 4.1 4.1 mV/mA

OUT

LINE REGULATION

V

200 mV < VIN < 12 V

OUT

I

= 0 mA 25 25 25 µV/V

OUT

RIPPLE REJECTION (∆V

OUT

/∆VIN)

VIN = 5 V ± 100 mV (f = 120 Hz) 80 80 80 dB

QUIESCENT CURRENT 70 70 70 µA

SHORT-CIRCUIT CURRENT TO GROUND 15 15 15 mA

NOISE VOLTAGE (@ 25°C)

0.1 Hz to 10 Hz 110 110 110 µV p-p
10 Hz to 10 kHz 90 90 90 µV rms

TURN-ON SETTLING TIME TO 0.1%

CL = 0.2 µF 140 140 140 µs

LONG-TERM STABILITY

1000 Hours @ 25°C 100 100 100 ppm/1000 hrs.

OUTPUT VOLTAGE HYSTERESIS 115 115 115 ppm

TEMPERATURE RANGE

Specified Performance (A, B, C) –40 +125 –40 +125 –40 +125 °C
Operating Performance (A, B, C) –55 +125 –55 +125 –55 +125 °C

Specifications subject to change without notice.

–4–

REV. D

AD1582/AD1583/AD1584/AD1585

AD1585–SPECIFICATIONS

(@ TA = T

MIN

to T

, VIN = 6 V, unless otherwise noted.)

MAX

AD1585A AD1585B AD1585C

Parameter Min Typ Max Min Typ Max Min Typ Max Unit

OUTPUT VOLTAGE (@ 25°C)

V

O

4.950 5.000 5.050 4.995 5.000 5.005 4.990 5.000 5.010 V

INITIAL ACCURACY ERROR (@ 25°C)

V

OERR

–50 +50 –5 +5 –10 +10 mV
–1.0 +1.0 –0.10 +0.10 –0.20 +0.20 %

OUTPUT VOLTAGE TEMPERATURE DRIFT 100 50 50 ppm/°C

TEMPERATURE COEFFICIENT (TCVO)

–40°C < TA < +125°C40100 18 50 18 50 ppm/°C
0°C < TA < 70°C351515ppm/°C

MINIMUM SUPPLY HEADROOM (VIN–V

) 200 200 200 mV

OUT

LOAD REGULATION

0 mA < I
0 mA < I
–5 mA < I
–5 mA < I
–0.1 mA < I
–0.1 mA < I

< 5 mA (–40°C to +85°C) 0.40 0.40 0.40 mV/mA

OUT

< 5 mA (–40°C to +125°C) 0.6 0.6 0.6 mV/mA

OUT

< 0 mA (–40°C to +85°C) 0.40 0.40 0.40 mV/mA

OUT

< 0 mA (–40°C to +125°C) 0.6 0.6 0.6 mV/mA

OUT

< +0.1 mA (–40°C to +85°C) 4 4 4 mV/mA

OUT

< +0.1 mA (–40°C to +125°C) 4.8 4.8 4.8 mV/mA

OUT

LINE REGULATION

V

200 mV < VIN < 12 V

OUT

I

= 0 mA 25 25 25 µV/V

OUT

RIPPLE REJECTION (∆V

OUT

/∆VIN)

VIN = 6 V ± 100 mV (f = 120 Hz) 80 80 80 dB

QUIESCENT CURRENT 70 70 70 µA

SHORT-CIRCUIT CURRENT TO GROUND 15 15 15 mA

NOISE VOLTAGE (@ 25°C)

0.1 Hz to 10 Hz 140 140 140 µV p-p
10 Hz to 10 kHz 100 100 100 µV rms

TURN-ON SETTLING TIME TO 0.1%

CL = 0.2 µF 175 175 175 µs

LONG-TERM STABILITY

1000 Hours @ 25°C 100 100 100 ppm/1000 hrs.

OUTPUT VOLTAGE HYSTERESIS 115 115 115 ppm

TEMPERATURE RANGE

Specified Performance (A, B, C) –40 +125 –40 +125 –40 +125 °C
Operating Performance (A, B, C) –55 +125 –55 +125 –55 +125 °C

Specifications subject to change without notice.

REV. D

–5–

AD1582/AD1583/AD1584/AD1585

ABSOLUTE MAXIMUM RATINGS

VIN to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 V

Internal Power Dissipation

2

1

SOT-23 (RT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400 mW

Storage Temperature Range . . . . . . . . . . . . –65°C to +125°C

Specified Temperature Range

AD1582RT/AD1583RT/,

AD1584RT/AD1585RT . . . . . . . . . . . . . –40°C to +125°C

Lead Temperature, Soldering

Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . 215°C

PACKAGE BRANDING INFORMATION

Four fields identify the device:

• First field, product identifier, for example, a “2/3/4/5” identifies
the generic as AD1582/AD1583/AD1584/AD1585

• Second field, device grade, which can be “A,” “B,” or “C”

• Third field, calendar year of processing, “7” for 1997...,

“A” for 2001...

• Fourth field, two-week window within the calendar year, for
example, letters A–Z to represent a two-week window starting
with “A” for the first two weeks of January.

Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220°C

NOTES

1

Stresses above those listed under Absolute Maximum Ratings may cause perma-

nent 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.

2

Specification is for device in free air at 25°C: SOT-23 package: θJA = 300°C/W.

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 AD1582/AD1583/AD1584/AD1585 feature 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.

WARNING!

ESD SENSITIVE DEVICE

ORDERING GUIDE

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

Model (V) (mV) (%) (ppm/C) Description Option Mark Parts per Reel

AD1582ART-R2 2.50 20 0.80 100 SOT-23 RT-3 2A0A 250
AD1582ART-Reel7 2.50 20 0.80 100 SOT-23 RT-3 2A0A 3000
AD1582BRT-R2 2.50 2 0.08 50 SOT-23 RT-3 2B0A 250
AD1582BRT-Reel7 2.50 2 0.08 50 SOT-23 RT-3 2B0A 3000
AD1582CRT-Reel7 2.50 4 0.16 50 SOT-23 RT-3 2C0A 3000

AD1583ART-R2 3.00 30 1.00 100 SOT-23 RT-3 3A0A 250
AD1583ART-Reel7 3.00 30 1.00 100 SOT-23 RT-3 3A0A 3000
AD1583BRT-R2 3.00 3 0.10 50 SOT-23 RT-3 3B0A 250
AD1583BRT-Reel7 3.00 3 0.10 50 SOT-23 RT-3 3B0A 3000
AD1583CRT-Reel7 3.00 6 0.20 50 SOT-23 RT-3 3C0A 3000

AD1584ART-R2 4.096 40 0.98 100 SOT-23 RT-3 4A0A 250
AD1584ART-Reel7 4.096 40 0.98 100 SOT-23 RT-3 4A0A 3000
AD1584BRT-R2 4.096 4 0.10 50 SOT-23 RT-3 4B0A 250
AD1584BRT-Reel7 4.096 4 0.10 50 SOT-23 RT-3 4B0A 3000
AD1584CRT-Reel7 4.096 8 0.20 50 SOT-23 RT-3 4C0A 3000

AD1585ART-R2 5.00 50 1.00 100 SOT-23 RT-3 5A0A 250
AD1585ART-Reel7 5.00 50 1.00 100 SOT-23 RT-3 5A0A 3000
AD1585BRT-R2 5.00 5 0.10 50 SOT-23 RT-3 5B0A 250
AD1585BRT-Reel7 5.00 5 0.10 50 SOT-23 RT-3 5B0A 3000
AD1585CRT-R2 5.00 10 0.20 50 SOT-23 RT-3 5C0A 250
AD1585CRT-Reel7 5.00 10 0.20 50 SOT-23 RT-3 5C0A 3000

–6–

REV. D

AD1582/AD1583/AD1584/AD1585

PARAMETER DEFINITIONS
Temperature Coefficient (TCV

)

O

The change of output voltage over the operating temperature
change and normalized by the output voltage at 25⬚C, expressed
in ppm/⬚C. The equation follows:

TCV

ppm CC/]°[=

O

O2 O1

°

VTT

O21

×−

()

()

×2510

6

VT VT

()−()

where:

V

(25⬚C) = VO at 25⬚C

O

V

) = VO at temperature 1

O(T1

V

) = VO at temperature 2

O(T2

Line Regulation (∆VO/∆VIN)

The change in output voltage due to a specified change in input
voltage. It includes the effects of self-heating. Line regulation is
expressed in either percent per volt, parts per million per volt, or
microvolts per volt change in input voltage.

Load Regulation (∆VO/∆I

LOAD

)

The change in output voltage due to a specified change in load
current. It includes the effects of self-heating. Load regulation is
expressed in either microvolts per milliampere, parts per million
per milliampere, or Ω of dc output resistance.

Long-Term Stability (∆VO)

Typical shift of output voltage at 25⬚C on a sample of parts
subjected to an operation life test of 1000 hours at 125⬚C:

Thermal Hysteresis (V

O_HYS

)

The change of output voltage after the device is cycled through
temperatures from +25⬚C to –40⬚C to +85°C and back to +25⬚C.
This is a typical value from a sample of parts put through such
a cycle:

VV V

V

where:

V

(25⬚C) = VO at 25⬚C

O

V

= VO at 25⬚C after temperature cycle at +25⬚C to

O_TC

=°

O_HYS O O_TC

ppm

[]

O_HYS

−

C

25

()

VV

C

°

−

25

()

OO_TC

=

V

C

°

25

()

O

6

×

10

–40⬚C to +85⬚C and back to +25⬚C

Operating Temperature

The temperature extremes at which the device can still function.
Parts may deviate from their specified performance outside the
specified temperature range.

∆∆VVt Vt

=

()−()

OO0 O1

Vt Vt

()−()

O0 O1

V

O

where:

V

) = VO at 25⬚C at time 0

O(t0

V

) = VO at 25⬚C after 1000 hours operation at 125⬚C

O(t1

=

[]

Vt

()

O0

×ppm 10

6

REV. D

–7–

AD1582/AD1583/AD1584/AD1585

–Typical Performance Characteristics

22

20

18

16

14

12

10

# OF PARTS

8

6

4

2

0

–60 50–50 –10 10

–40 –30 –20 0 20

ppm/C

30

40

TPC 1. Typical Output Voltage Temperature Drift
Distribution

50

45

40

35

30

25

# OF PARTS

20

15

10

5

0
–1.00% 1.00%–0.60% –0.20% 0.20% 0.60%

V

OUT

(ERROR)

TPC 2. Typical Output Voltage Error Distribution

0.40

0.35

0.30

0.25

0.20

mV/mA

0.15

0.10

0.05

0

0 24681012

AD1582

TPC 4. Load Regulation vs. V

0

–10

–20

–30

–40

V/V

–50

–60

–70

–80

–90

–5 1–4 –3 –2 –1 0 2 3 4 5

AD1582

AD1585

TPC 5. Line Regulation vs. I

I

OUT

AD1585

VIN (V)

IN

(mA)

LOAD

2.504

2.502

2.500

2.498

2.496

OUT

V

2.494

2.492

2.490

2.488
–40 –20 0 20 40 60 80 100 120

TEMPERATURE ( C)

TPC 3. Typical Temperature Drift Characteristic Curves

–8–

10k

1k

nV/ Hz

100

I

I

= 0

OUT

1k10010

FREQUENCY (Hz)

10k

TPC 6. Noise Spectral Density

OUT

= 1mA

100k

REV. D

THEORY OF OPERATION

The AD1582/AD1583/AD1584/AD1585 family uses the band gap
concept to produce stable, low temperature coefficient voltage
references suitable for high accuracy data acquisition components
and systems. This family of precision references uses the underlying
temperature characteristics of a silicon transistor’s base emitter
voltage in the forward-biased operating region. Under this
condition, all such transistors have a –2 mV/°C temperature
coefficient (TC) and a V

that, when extrapolated to absolute

BE

zero, 0°K (with collector current proportional to absolute
temperature), approximates the silicon band gap voltage. By
summing a voltage that has an equal and opposite temperature
coefficient of 2 mV/°C with the V

of a forward-biased transistor,

BE

an almost zero TC reference can be developed. In the AD1582/
AD1583/AD1584/AD1585 simplified circuit diagram shown in
Figure 2, such a compensating voltage, V1, is derived by
driving two transistors at different current densities and
amplifying the resultant V
TC). The sum of V

difference (∆VBE, which has a positive

BE

and V1(VBG) is then buffered and ampli-

BE

fied to produce stable reference voltage outputs of 2.5 V, 3 V,

4.096 V, and 5 V.

V

R3

+

V

R2

BE

–

R1

R4

+

V1

–

IN

V

OUT

R5

V

BG

R6

GND

Figure 2. Simplified Schematic

APPLYING THE AD1582/AD1583/AD1584/AD1585

The AD1582/AD1583/AD1584/AD1585 is a family of series
references that can be used for many applications. To achieve
optimum performance with these references, only two external
components are required. Figure 3 shows the AD1582 configured
for operation under all loading conditions. With a simple 4.7 µF
capacitor attached to the input and a 1 µF capacitor applied
to the output, the devices can achieve specified performance for
all input voltage and output current requirements. For best
transient response, add a 0.1 µF capacitor in parallel with the 4.7 µF
capacitor. While a 1 µF output capacitor can provide stable
performance for all loading conditions, the AD1582 can operate
under low (–100 µA < I

< +100 µA) current conditions with

OUT

just a 0.2 µF output capacitor. The 4.7 µF capacitor on the input can
be reduced to 1 µF in this condition.

Unlike conventional shunt reference designs, the AD1582/
AD1583/AD1584/AD1585 family provides stable output voltages
at constant operating current levels. When properly decoupled,
as shown in Figure 3, these devices can be applied to any circuit
and provide superior low power solutions.

AD1582/AD1583/AD1584/AD1585

1

2

V

IN

4.7F

3

AD1582/
AD1583/
AD1584/
AD1585

Figure 3. Typical Connection Diagram

TEMPERATURE PERFORMANCE

The AD1582/AD1583/AD1584/AD1585 family of references is
designed for applications where temperature performance is
important. Extensive temperature testing and characterization
ensures that the device’s performance is maintained over the
specified temperature range.

The error band guaranteed with the AD1582/AD1583/AD1584/
AD1585 family is the maximum deviation from the initial value at
25°C. Thus, for a given grade of the AD1582/AD1583/AD1584/
AD1585, the designer can easily determine the maximum total
error by summing initial accuracy and temperature variation,
e.g., for the AD1582BRT, the initial tolerance is ±2 mV, the
temperature error band is ±8 mV, thus the reference is guaranteed
to be 2.5 V ± 10 mV from –40°C to +125°C.

Figure 4 shows the typical output voltage drift for the AD1582
and illustrates the methodology. The box in Figure 4 is bounded on
the x-axis by operating temperature extremes. It is bounded
on the y-axis by the maximum and minimum output voltages
observed over the operating temperature range. The slope of the
diagonal drawn from the initial output value at 25°C to the output
values at +125°C and –40°C determines the performance grade of
the device.

Duplication of these results requires a test system that is highly
accurate with stable temperature control. Evaluation of the
AD1582 produces curves similar to those in TPC 3 and Figure 4,
but output readings may vary depending upon the test methods
and test equipment used.

2.504

2.502

2.500

(V)

2.498

OUT

V

2.496

2.494

2.492
–40 –20 0 20 40 60 80 100 120

TEMPERATURE ( C)

Figure 4. Output Voltage vs. Temperature

+

V

OUT1F

–

REV. D

–9–

AD1582/AD1583/AD1584/AD1585

pp

VOLTAGE OUTPUT NONLINEARITY VERSUS TEMPERATURE

When using a voltage reference with data converters, it is impor­tant to understand the impact that temperature drift can have on
the converter’s performance. The nonlinearity of the reference
output drift represents additional error that cannot easily be
calibrated out of the overall system. To better understand the
impact such a drift can have on a data converter, refer to Figure 5
where the measured drift characteristic is normalized to the
endpoint average drift. The residual drift error of the AD1582
of approximately 200 ppm demonstrates that this family of
references is compatible with systems that require 12-bit
accurate temperature performance.

250

200

150

100

(ppm)

OUT

50

V

0

80

70

60

50

40

# OF PARTS

30

20

10

0

–700 –450 –200 50 300 550

m

Figure 6. Output Voltage Hysteresis Distribution

SUPPLY CURRENT VERSUS TEMPERATURE

The quiescent current for the AD1582/AD1583/AD1584/AD1585
family of references varies slightly over temperature and input
supply range. Figure 7 demonstrates the typical performance
for the AD1582 reference when varying both temperature and
supply voltage. As is evident from the graph, the AD1582 supply
current increases only 1.0 µA/V, making this device extremely
attractive for use in applications where there may be wide varia­tions in supply voltage and a need to minimize power dissipation.

–50

–50 100–25 0 25 5075

TEMPERATURE (C)

Figure 5. Residual Drift Error

OUTPUT VOLTAGE HYSTERESIS

High performance industrial equipment manufacturers may
require the AD1582/AD1583/AD1584/AD1585 family to maintain
a consistent output voltage error at 25°C after the references are
operated over the full temperature range. While all references
exhibit a characteristic known as output voltage hysteresis, the
AD1582/AD1583/AD1584/AD1585 family is designed to minimize
this characteristic. This phenomenon can be quantified by
measuring the change in the +25°C output voltage after
temperature excursions from +125°C to +25°C, and from –40°C
to +25°C. Figure 6 displays the distribution of the AD1582
output voltage hysteresis.

100

80

60

(A)

Q

I

40

20

0

34567891011

TA = +85C

TA = –40C

TA = +25C

V

(V)

IN

Figure 7. Typical Supply Current over Temperature

SUPPLY VOLTAGE

One of the ideal features of the AD1582/AD1583/AD1584/AD1585
is low supply voltage headroom. The parts can operate at
supply voltages as low as 200 mV above V
However, if negative voltage is inadvertently applied to V

and up to 12 V.

OUT

IN

with

respect to ground or any negative transient, >5 V is coupled to

and the device may be damaged.

V

IN

–10–

REV. D

AD1582/AD1583/AD1584/AD1585

)

AC PERFORMANCE

To apply the AD1582/AD1583/AD1584/AD1585 family of
references, it is important to understand the effects of dynamic
output impedance and power supply rejection. In Figure 8a, a
voltage divider is formed by the AD1582’s output impedance and
by the external source impedance. Figure 8b shows the effect of
varying the load capacitor on the reference output. Power supply
rejection ratio (PSRR) should be determined when characterizing
the ac performance of a series voltage reference. Figure 9a shows a
test circuit used to measure PSRR, and Figure 9b demonstrates
the AD1582’s ability to attenuate line voltage ripple.

V

DC

2  V

2V

OUT

10k

10k

1

100A

LOAD

10k

1F

2k

5V

DUT

5F

Figure 8a. Output Impedance Test Circuit

100

1F CAP

10

AD1585

AD1582

1

OUTPUT IMPEDANCE ()

0.1
10 100 1k 10k 100k 1M

FREQUENCY (Hz)

Figure 8b. Output Impedance vs. Frequency



10k

10V

200mV

10k

1



0.22



F

5V 100mV

DUT

V

OUT

0.22F

NOISE PERFORMANCE AND REDUCTION

The noise generated by the AD1582 is typically less than
70 µV p-p over the 0.1 Hz to 10 Hz frequency band. Figure 10
shows the 0.1 Hz to 10 Hz noise of a typical AD1582. The noise
measurement is made with a high gain band-pass filter. Noise in
a 10 Hz to 10 kHz region is approximately 50 µV rms. Figure 11
shows the broadband noise of a typical AD1582. If further noise
reduction is desired, a 1-pole low-pass filter may be added
between the output pin and the ground. A time constant of 0.2 ms
has a –3 dB point at roughly 800 Hz, and reduces the high
frequency noise to about 16 µV rms. It should be noted,
however, that while additional filtering on the output may improve
the noise performance of the AD1582/AD1583/AD1584/AD1585
family, the added output impedance could degrade the ac
performance of the references.

10V 1s

100

90

10

0%

Figure 10. 0.1 Hz to 10 Hz Voltage Noise

100V

100

90

10

0%

10ms

Figure 11. 10 Hz to 10 kHz Wideband Noise

REV. D

Figure 9a. Ripple Rejection Test Circuit

100

90

80

70

60

50

40

PSRR (dB)

30

20

10

0

11M10 100 1k 10k 100k

FREQUENCY (Hz

AD1582

AD1585

Figure 9b. Ripple Rejection vs. Frequency

–11–

AD1582/AD1583/AD1584/AD1585

TURN-ON TIME

Many low power instrument manufacturers are becoming increas­ingly concerned with the turn-on characteristics of the components
being used in their systems. Fast turn-on components often enable
the end user to save power by keeping power off when it is not
needed. Turn-on settling time is defined as the time required, after
the application of power (cold start), for the output voltage to
reach its final value within a specified error. The two major factors
affecting this are the active circuit settling time and the time
required for the thermal gradients on the chip to stabilize.
Figure 12a shows the turn-on settling and transient response test
circuit. Figure 12b shows the turn-on characteristic of the
AD1582. This characteristic is generated from cold-start operation
and represents the true turn-on waveform after power-up.
Figure 12c shows the fine settling characteristics of the AD1582.
Typically, the reference settles to within 0.1% of its final value
in about 100 µs.

The device can momentarily draw excessive supply current
when V

is slightly below the minimum specified level.

SUPPLY

Power supply resistance must be low enough to ensure reliable
turn-on. Fast power supply edges minimize this effect.

0V OR 10V

0V TO 10V

10k

10k

1

0.22F
DUT

V

OUT

5V OR 10V
0V OR 5V

0.22F

DYNAMIC PERFORMANCE

Many A/D and D/A converters present transient current loads
to the reference, and poor reference response can degrade the
converter’s performance. The AD1582/AD1583/AD1584/AD1585
family of references provides superior static and dynamic line
and load regulation. Since these series references are capable of
both sourcing and sinking large current loads, they exhibit
excellent settling characteristics.

Figure 13 displays the line transient response for the AD1582.
The circuit used to perform such a measurement is shown in
Figure 12a, where the input supply voltage is toggled from 5 V
to 10 V and the input and output capacitors are each 0.22 µF.

Figures 14 and 15 show the load transient settling characteristics
for the AD1582 when load current steps of 0 mA to +5 mA
and 0 mA to –1 mA are applied. The input supply voltage
remains constant at 5 V, the input decoupling and output load
capacitors are 4.7 µF and 1 µF, respectively, and the output current
is toggled. For both positive and negative current loads, the
reference responses settle very quickly and exhibit initial voltage
spikes less than 10 mV.

5V

100

90

50s

Figure 12a. Turn-On/Transient Response Test Circuit

5V

100

90

10

0%

1V

20s

20s

Figure 12b. Turn-On Characteristics

5V

100

90

10

0%

1mV

20s

20s

10

0%

200mV

50s

Figure 13. Line Transient Response

5V

100

90

10

0%

5mV

20s

20s

Figure 14. Load Transient Response (0 mA to 5 mA Load)

5V

100

90

20s

Figure 12c. Turn-On Settling

10

0%

5mV

20s

Figure 15. Load Transient Response (0 mA to –1 mA Load)

–12–

REV. D

AD1582/AD1583/AD1584/AD1585

OUTLINE DIMENSIONS

3-Lead Small Outline Transistor Package [SOT-23-3]

(RT-3)

Dimensions shown in millimeters

3.04

2.90

1.40

1.30

1.20

PIN 1

0.10

0.01

2.80

3

1

1.90 BSC

SEATING
PLANE

COMPLIANT TO JEDEC STANDARDS TO-236AB

2

0.95 BSC

2.64

2.10

0.50

0.30

1.12

0.89

0.60

0.50

0.40

0.20

0.08

1.55

1.50

1.50

8.30

8.00

7.70

DIRECTION OF UNREELING

3.20

3.10

2.90

4.10

4.00

3.90

2.05

2.00

1.95

1.00 MIN

3.55

3.50

3.45

0.75 MIN

1.85

1.75

1.65

SOT-23 Tape and Reel

Dimensions shown in millimeters

1.10

1.00

0.90

2.80

2.70

2.60

0.35

0.30

0.25

7" REEL 100.00

13" REEL 330.00

20.20
MIN

OR

1.50 MIN

13.20

13.00

12.80

14.40 MAX

7" REEL 50.00 MIN
OR
13" REEL 100.00 MIN

9.90

8.40

8.40

REV. D

–13–

AD1582/AD1583/AD1584/AD1585

Revision History

Location Page

6/04—Data Sheet Changed from REV. C to REV. D.

Changes to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Updated OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

12/02—Data Sheet Changed from REV. B to REV. C.

Changes to FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Changes to GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Changes to SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Changes to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

TPC 3 replaced . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Changes to TEMPERATURE PERFORMANCE section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 4 replaced . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Changes to OUTPUT VOLTAGE HYSTERESIS section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

SOT-23 package updated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

–14–

REV. D

–15–

C00701–0–6/04(D)

–16–