2.5 V to 5.0 V Micropower, Precision
www.BDTIC.com/ADI
FEATURES
Ser ies r efe ren ce ( 2.5 V, 3 V, 4. 096 V, 5 V)
Low quiescent current: 70 μA maximum
Current output capability: ±5 mA
Wide supply range: V
Wideband noise (10 Hz to 10 kHz): 50 μV rms
Specified temperature range: −40°C to +125°C
Compact, surface-mount SOT-23 package
APPLICATIONS
Portable, battery-powered equipment; for example,
notebook computers, cellular phones, pagers, PDAs, GPSs,
and DMMs
Computer workstations; suitable for use with a wide range
of video RAMDACs
Smart industrial transmitters
PCMCIA cards
Automotive
Hard disk drives
3 V/5 V, 8-bit/12-bit data converters
IN
= V
+ 200 mV to 12 V
OUT
Series Mode Voltage References
AD1582/AD1583/AD1584/AD1585
PIN CONFIGURATION
AD1582/
1
V
OUT
AD1583/
AD1584/
AD1585
TOP VIEW
2
GND
(Not t o Scal e)
Figure 1. 3-Lead SOT-23-3 (RT Suffix)
900
800
700
600
500
(µA)
400
SUPPLY
I
300
200
100
0
2.7 5
Figure 2. Supply Current (μA) vs. Supply Voltage (V)
SHUNT REFERENCE
AD1582 SERIES REFERENCE
V
SUPPLY
3
V
IN
0701-001
1
(V)
1
3.076kΩ SOURCE RESISTOR.
00701-002
GENERAL DESCRIPTION
The AD1582/AD1583/AD1584/AD1585 are low cost, low power,
low dropout, precision band gap references. These designs are
available as 3-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 can 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 result from 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.
Rev. H
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.
The AD1582/AD1583/AD1584/AD1585 series mode devices
source or sink up to 5 mA of load current and operate efficiently
with only 200 mV of required headroom supply. These parts
draw 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/AD1585 are available in two
grades, A and B, 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.
Table 1. AD158x Products, Three Electrical Grades
Electrical
Grade
B 0.08% 0.10% 0.10% 50
A 0.80% 1.00% 0.98% 100
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 ©1997–2007 Analog Devices, Inc. All rights reserved.
AD1582 AD1583/AD1585 AD1584
Initial Accuracy Temperature
Coefficient
(ppm°C)
AD1582/AD1583/AD1584/AD1585
www.BDTIC.com/ADI
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Pin Configuration ............................................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
AD1582 Specifications ................................................................. 3
AD1583 Specifications ................................................................. 4
AD1584 Specifications ................................................................. 5
AD1585 Specifications ................................................................. 6
Absolute Maximum Ratings ............................................................ 7
ESD Caution .................................................................................. 7
Terminology ...................................................................................... 8
Typical Performance Characteristics ............................................. 9
Theory of Operation ...................................................................... 10
Applications Information .............................................................. 11
Temperature Performance......................................................... 11
Voltage Output Nonlinearity vs. Temperature ....................... 11
Output Voltage Hysteresis ......................................................... 12
Supply Current vs. Temperature ............................................... 12
Supply Voltage ............................................................................ 12
AC Performance ......................................................................... 12
Noise Performance and Reduction .......................................... 13
Turn-On Time ............................................................................ 13
Dynamic Performance ............................................................... 14
Outline Dimensions ....................................................................... 15
Ordering Guide .......................................................................... 16
Package Branding Information ................................................ 16
REVISION HISTORY
11/07—Rev. G to Rev. H
Deleted C Grade ................................................................. Universal
Changes to VOERR Parameter ....................................................... 3
Changes to Ordering Guide .......................................................... 16
6/06—Rev. F to Rev. G
Changes to Features .......................................................................... 1
Changes to General Description .................................................... 1
2/06—Rev. E to Rev. F
Updated Format .................................................................. Universal
Changes to Features .......................................................................... 1
Changes to Table 6 ............................................................................ 7
Changes to Ordering Guide .......................................................... 16
6/05—Rev. D to Rev. E
Changes to Ordering Guide ........................................................... 7
Moved Package Branding Section .................................................. 7
6/04—Rev. C to Rev. D
Changes to Ordering Guide ............................................................ 6
Updated Outline Dimensions ....................................................... 13
12/02—Rev. B to Rev. C
Changes to Features .......................................................................... 1
Changes to General Description ..................................................... 1
Changes to Specifications ................................................................. 2
Changes to Absolute Maximum Ratings ........................................ 6
Replaced TPC 3 ................................................................................. 8
Changes to Temperature Performance Section ............................. 9
Replaced Figure 4 .............................................................................. 9
Changes to Output Voltage Hysteresis Section .......................... 10
Updated SOT-23 Package .............................................................. 13
3/97—Revision 0: Initial Version
Rev. H | Page 2 of 16
AD1582/AD1583/AD1584/AD1585
www.BDTIC.com/ADI
SPECIFICATIONS
AD1582 SPECIFICATIONS
TA = T
Table 2.
AD1582A AD1582B
Parameter Min Typ Max Min Typ Max Unit
OUTPUT VOLTAGE (@ 25°C)
INITIAL ACCURACY ERROR (@ 25°C)
−0.80 +0.80 −0.08 +0.08 %
OUTPUT VOLTAGE TEMPERATURE DRIFT 100 50 ppm/°C
TEMPERATURE COEFFICIENT (TCVO)
MINIMUM SUPPLY HEADROOM (VIN – V
LOAD REGULATION
LINE REGULATION
RIPPLE REJECTION (∆V
QUIESCENT CURRENT 70 70 µA
SHORT-CIRCUIT CURRENT TO GROUND 15 15 mA
NOISE VOLTAGE (@ 25°C)
TURN-ON SETTLING TIME TO 0.1%
LONG-TERM STABILITY
OUTPUT VOLTAGE HYSTERESIS 115 115 ppm
TEMPERATURE RANGE
to T
MIN
VO 2.480 2.500 2.520 2.498 2.500 2.502 V
V
−20 +20 −2 +2 mV
OERR
−40°C < TA < +125°C 40 100 18 50 ppm/°C
0°C < TA < 70°C 35 15 ppm/°C
0 mA < I
0 mA < I
−5 mA < I
−5 mA < I
−0.1 mA < I
−0.1 mA < I
V
+ 200 mV < VIN < 12 V
OUT
I
= 0 mA 25 25 µV/V
OUT
VIN = 5 V ± 100 mV (f = 120 Hz) 80 80 dB
0.1 Hz to 10 Hz 70 70 µV p-p
10 Hz to 10 kHz 50 50 µV rms
CL = 0.2 µF 100 100 µs
1000 Hours @ 25°C 100 100 ppm/1000 hr
Specified Performance (A, B, C) −40 +125 −40 +125 °C
Operating Performance (A, B, C) −55 +125 −55 +125 °C
, VIN = 5 V, unless otherwise noted.
MAX
) 200 200 mV
OUT
< 5 mA (−40°C to +85°C) 0.2 0.2 mV/mA
OUT
< 5 mA (−40°C to +125°C) 0.4 0.4 mV/mA
OUT
< 0 mA (−40°C to +85°C) 0.25 0.25 mV/mA
OUT
< 0 mA (−40°C to +125°C) 0.45 0.45 mV/mA
OUT
< +0.1 mA (−40°C to +85°C) 2.7 2.7 mV/mA
OUT
< +0.1 mA (−40°C to +125°C) 3.5 3.5 mV/mA
OUT
/∆VIN)
OUT
Rev. H | Page 3 of 16
AD1582/AD1583/AD1584/AD1585
www.BDTIC.com/ADI
AD1583 SPECIFICATIONS
TA = T
Table 3.
AD1583A AD1583B
Parameter Min Typ Max Min Typ Max Unit
OUTPUT VOLTAGE (@ 25°C)
INITIAL ACCURACY ERROR (@ 25°C)
−1.0 +1.0 −0.1 +0.1 %
OUTPUT VOLTAGE TEMPERATURE DRIFT 100 50 ppm/°C
TEMPERATURE COEFFICIENT (TCVO)
MINIMUM SUPPLY HEADROOM (VIN – V
LOAD REGULATION
LINE REGULATION
RIPPLE REJECTION (∆V
QUIESCENT CURRENT 70 70 µA
SHORT-CIRCUIT CURRENT TO GROUND 15 15 mA
NOISE VOLTAGE (@ 25°C)
TURN-ON SETTLING TIME TO 0.1%
LONG-TERM STABILITY
OUTPUT VOLTAGE HYSTERESIS 115 115 ppm
TEMPERATURE RANGE
to T
MIN
VO 2.970 3.000 3.030 2.997 3.000 3.003 V
V
−30 +30 −3 +3 mV
OERR
–40°C < TA < +125°C 40 100 18 50 ppm/°C
0°C < TA < 70°C 35 15 ppm/°C
0 mA < I
0 mA < I
–5 mA < I
–5 mA < I
–0.1 mA < I
–0.1 mA < I
V
+ 200 mV < VIN < 12 V
OUT
I
= 0 mA 25 25 µV/V
OUT
VIN = 5 V ± 100 mV (f = 120 Hz) 80 80 dB
0.1 Hz to 10 Hz 85 85 µV p-p
10 Hz to 10 kHz 60 60 µV rms
CL = 0.2 µF 120 120 µs
1000 Hours @ 25°C 100 100 ppm/1000 hr
Specified Performance (A, B, C) −40 +125 −40 +125 °C
Operating Performance (A, B, C) −55 +125 −55 +125 °C
, VIN = 5 V, unless otherwise noted.
MAX
) 200 200 mV
OUT
< 5 mA (–40°C to +85°C) 0.25 0.25 mV/mA
OUT
< 5 mA (–40°C to +125°C) 0.45 0.45 mV/mA
OUT
< 0 mA (–40°C to +85°C) 0.40 0.40 mV/mA
OUT
< 0 mA (–40°C to +125°C) 0.6 0.6 mV/mA
OUT
< +0.1 mA (–40°C to +85°C) 2.9 2.9 mV/mA
OUT
< +0.1 mA (–40°C to +125°C) 3.7 3.7 mV/mA
OUT
/∆VIN)
OUT
Rev. H | Page 4 of 16
AD1582/AD1583/AD1584/AD1585
www.BDTIC.com/ADI
AD1584 SPECIFICATIONS
TA = T
Table 4.
AD1584A AD1584B
Parameter Min Typ Max Min Typ Max Unit
OUTPUT VOLTAGE (@ 25°C)
INITIAL ACCURACY ERROR (@ 25°C)
−0.98 +0.98 −0.1 +0.1 %
OUTPUT VOLTAGE TEMPERATURE DRIFT 100 50 ppm/°C
TEMPERATURE COEFFICIENT (TCVO)
MINIMUM SUPPLY HEADROOM (VIN – V
LOAD REGULATION
LINE REGULATION
RIPPLE REJECTION (∆V
QUIESCENT CURRENT 70 70 µA
SHORT-CIRCUIT CURRENT TO GROUND 15 15 mA
NOISE VOLTAGE (@ 25°C)
TURN-ON SETTLING TIME TO 0.1%
LONG-TERM STABILITY
OUTPUT VOLTAGE HYSTERESIS 115 115 ppm
TEMPERATURE RANGE
to T
MIN
VO 4.056 4.096 4.136 4.092 4.096 4.100 V
V
−40 +40 −4 +4 mV
OERR
−40°C < TA < +125°C 40 100 18 50 ppm/°C
0°C < TA < 70°C 35 15 ppm/°C
0 mA < I
0 mA < I
−5 mA < I
−5 mA < I
−0.1 mA < I
−0.1 mA < I
V
+ 200 mV < VIN 12 V
OUT
I
= 0 mA 25 25 µV/V
OUT
VIN = 5 V ± 100 mV (f = 120 Hz) 80 80 dB
0.1 Hz to 10 Hz 110 110 µV p-p
10 Hz to 10 kHz 90 90 µV rms
CL = 0.2 µF 140 140 µs
1000 Hours @ 25°C 100 100 ppm/1000 hr
Specified Performance (A, B, C) −40 +125 −40 +125 °C
Operating Performance (A, B, C) −55 −125 −55 +125 °C
, VIN = 5 V, unless otherwise noted.
MAX
) 200 200 mV
OUT
< 5 mA (−40°C to +85°C) 0.32 0.32 mV/mA
OUT
< 5 mA (−40°C to +125°C) 0.52 0.52 mV/mA
OUT
< 0 mA (−40°C to +85°C) 0.40 0.40 mV/mA
OUT
< 0 mA (−40°C to +125°C) 0.6 0.6 mV/mA
OUT
< +0.1 mA (−40°C to +85°C) 3.2 3.2 mV/mA
OUT
< +0.1 mA (−40°C to +125°C) 4.1 4.1 mV/mA
OUT
/∆VIN)
OUT
Rev. H | Page 5 of 16
AD1582/AD1583/AD1584/AD1585
www.BDTIC.com/ADI
AD1585 SPECIFICATIONS
@ TA = T
Table 5.
AD1585A AD1585B
Parameter Min Typ Max Min Typ Max Unit
OUTPUT VOLTAGE (@ 25°C)
VO 4.950 5.000 5.050 4.995 5.000 5.005 V
INITIAL ACCURACY ERROR (@ 25°C)
V
−1.0 +1.0 −0.10 +0.10 %
OUTPUT VOLTAGE TEMPERATURE DRIFT 100 50 ppm/°C
TEMPERATURE COEFFICIENT (TCVO)
−40°C < TA < 125°C 40 100 18 50 ppm/°C
0°C < TA < 70°C 35 15 ppm/°C
MINIMUM SUPPLY HEADROOM (VIN – V
LOAD REGULATION
0 mA < I
0 mA < I
−5 mA < I
−5 mA < I
−0.1 mA < I
−0.1 mA < I
LINE REGULATION
V
I
OUT
RIPPLE REJECTION (∆V
VIN = 6 V ± 100 mV (f = 120 Hz) 80 80 dB
QUIESCENT CURRENT 70 70 µA
SHORT-CIRCUIT CURRENT TO GROUND 15 15 mA
NOISE VOLTAGE (@ 25°C)
0.1 Hz to 10 Hz 140 140 µV p-p
10 Hz to 10 kHz 100 100 µV rms
TURN-ON SETTLING TIME TO 0.1%
CL = 0.2 F 175 175 µs
LONG-TERM STABILITY
1000 Hours @ 25°C 100 100 ppm/1000 hr
OUTPUT VOLTAGE HYSTERESIS 115 115 ppm
TEMPERATURE RANGE
Specified Performance (A, B, C) −40 +125 −40 +125 °C
Operating Performance (A, B, C) −55 +125 −55 +125 °C
to T
MIN
−50 +50 −5 +5 mV
OERR
OUT
OUT
+ 200 mV < VIN < 12 V
OUT
= 0 mA 25 25 µV/V
, VIN = 6 V, unless otherwise noted.
MAX
) 200 200 mV
OUT
< 5 mA (−40°C to +85°C) 0.40 0.40 mV/mA
< 5 mA (−40°C to +125°C) 0.6 0.6 mV/mA
< 0 mA (−40°C to +85°C) 0.40 0.40 mV/mA
OUT
< 0 mA (−40°C to +125°C) 0.6 0.6 mV/mA
OUT
< +0.1 mA (−40°C to +85°C) 4 4 mV/mA
OUT
< +0.1 mA (−40°C to +125°C) 4.8 4.8 mV/mA
OUT
/∆VIN)
OUT
Rev. H | Page 6 of 16
AD1582/AD1583/AD1584/AD1585
www.BDTIC.com/ADI
ABSOLUTE MAXIMUM RATINGS
Table 6.
Parameter Rating
VIN to Ground 12 V
Internal Power Dissipation
SOT-23-3 (RT-3) 400 mW
Storage Temperature Range 65°C to 125°C
Specified Temperature Range
AD1582RT/AD1583RT/
AD1584RT/AD1585RT
Lead Temperature, Soldering
Vapor Phase (60 sec) 215°C
Infrared (15 sec) 220°C
1
Specification is for device in free air at 25°C; SOT-23 package, θJA = 300°C.
1
−40°C to +125°C
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
Rev. H | Page 7 of 16
AD1582/AD1583/AD1584/AD1585
(
−°=
(
www.BDTIC.com/ADI
TERMINOLOGY
Temperature Coefficient (TCVO)
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
() ()
−
TVTV
[]
TCV
O
=°
Cppm/ ×
2
O
()
25
O
1
O
−×°
()
6
10
TTCV
12
where:
V
(25°C) = VO @ 25°C.
O
(T1) = VO @ Temperature 1.
V
O
V
(T2) = VO @ Temperature 2.
O
Line Regulation (ΔV
/ΔVIN) Definition
O
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 (ΔV
O
/ΔI
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 ohms of dc output resistance.
Long-Term Stability (ΔV
)
O
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.
()
OO
()
tVtVV −=Δ
0
1
O
Thermal Hysteresis (V
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
25
_
V
_
OHYSO
[]
ppm ×
HYSO
=
where:
(25°C) = VO at 25°C.
V
O
V
= VO at 25°C after temperature cycle at +25°C to −40°C to
O_TC
+85°C and back to +25°C.
Operating Temperature
The temperature extremes at which the device can still function.
Parts can deviate from their specified performance outside the
specified temperature range.
O_HYS
)
O
)
VCVV
25
O
TCO
_
)
−°
VCV
_
TCO
()
25
°
CV
10
6
−
[]
V
O
=Δ
()
0
O
()
tV
0
O
tVtV
()
1
O
6
10ppm ×
where:
V
(t0) = VO @25°C at Time 0.
O
(t1) = VO @ 25°C after 1000 hours of operation at 125°C.
V
O
Rev. H | Page 8 of 16
AD1582/AD1583/AD1584/AD1585
V
www.BDTIC.com/ADI
TYPICAL PERFORMANCE CHARACTERISTICS
22
20
18
16
14
12
10
8
NUMBER OF PARTS
6
4
2
0
–60 –50 –40 –30 –20 –10 0 10 20 30 40 50
ppm/°C
Figure 3. Typical Output Voltage Temperature Drift Distribution
00701-003
0.40
0.35
0.30
0.25
0.20
mV/mA
0.15
0.10
0.05
0
024681012
AD1582
V
IN
AD1585
(V)
Figure 6. Load Regulation vs. VIN
0701-006
50
45
40
35
30
25
20
NUMBER OF PARTS
15
10
5
0
V
(ERROR)
OUT
Figure 4. Typical Output Voltage Error Distribution
2.504
2.502
2.500
2.498
2.496
OUT
V
2.494
0
–10
–20
–30
–40
µV/
–50
–60
–70
–80
1.0%0.6%0.2%–0.2%–0.6%–1.0%
00701-004
–90
–5 –4 –3 –2 –1 0 1 2 3 4 5
10k
1k
nV/ Hz
AD1582
AD1585
I
(mA)
OUT
Figure 7. Line Regulation vs. I
I
OUT
LOAD
= 0mA
00701-007
I
= 1mA
OUT
2.492
2.490
2.488
–40 0–20 20 40 60 80 100 120
TEMPERATURE (°C)
Figure 5. Typical Temperature Drift Characteristic Curves
00701-005
100
Figure 8. Noise Spectral Density
Rev. H | Page 9 of 16
1k10010
FREQUENCY (Hz)
10k 100k
0701-008
AD1582/AD1583/AD1584/AD1585
www.BDTIC.com/ADI
THEORY OF OPERATION
The AD1582/AD1583/AD1584/AD1585 use the band gap
concept to produce stable, low temperature coefficient voltage
references suitable for high accuracy data acquisition components and systems. These parts of precision references use 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
BE
to absolute 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
BE
transistor, an almost 0 TC reference can be developed. In the
AD1582/AD1583/AD1584/AD1585 simplified circuit diagram
shown in Figure 9, 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
BE
difference (∆VBE, which has a positive
BE
and V1 (VBG) is then buffered and amplified
to produce stable reference voltage outputs of 2.5 V, 3 V, 4.096 V,
and 5 V.
R3
+
R2
V
BE
–
R1
R4
+
V1
–
Figure 9. Simplified Schematic
V
IN
V
OUT
R5
V
BG
R6
GND
00701-009
Rev. H | Page 10 of 16
AD1582/AD1583/AD1584/AD1585
V
www.BDTIC.com/ADI
APPLICATIONS INFORMATION
The AD1582/AD1583/AD1584/AD1585 are series references
that can be used for many applications. To achieve optimum
performance with these references, only two external components are required. Figure 10 shows the AD1582/AD1583/
AD1584/AD1585 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/AD1583/AD1584/AD1585 can operate under low
(−100 µA < I
< +100 µA) current conditions with just a
OUT
0.2 µF output capacitor. The 4.7 µF capacitor on the input can
be reduced to 1 F in this condition.
Unlike conventional shunt reference designs, the AD1582/
AD1583/AD1584/AD1585 provide stable output voltages at
constant operating current levels. When properly decoupled,
as shown in Figure 10, these devices can be applied to any
circuit and provide superior low power solutions.
AD1582/
AD1583/
IN
4.7µF
3
AD1584/
AD1585
Figure 10. Typical Connection Diagram
1
2
1µF
+
V
OUT
–
00701-010
TEMPERATURE PERFORMANCE
The AD1582/AD1583/AD1584/AD1585 are designed for
applications where temperature performance is important.
Extensive temperature testing and characterization ensure
that device performance is maintained over the specified
temperature range.
The error band guaranteed with the AD1582/AD1583/AD1584/
AD1585 is the maximum deviation from the initial value at 25°C.
Therefore, 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. For
example, for the AD1582BRT, the initial tolerance is ±2 mV,
and the temperature error band is ±8 mV; therefore, the reference
is guaranteed to be 2.5 V ± 10 mV from −40°C to +125°C.
Figure 11 shows the typical output voltage drift for the AD1582/
AD1583/AD1584/AD1585 and illustrates the methodology. The
box in Figure 11 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/AD1583/AD1584/AD1585 produces curves similar
to those in Figure 5 and Figure 11, but output readings can vary
depending on the test methods and test equipment used.
2.504
2.504
2.502
2.502
2.500
2.500
(V)
(V)
2.498
2.498
OUT
OUT
V
V
2.496
2.496
2.494
2.494
2.492
2.492
–40 –20 0 20 40 60 80 100 120
–40 –20 0 20 40 60 80 100 120
Figure 11. Output Voltage vs. Temperature
TEMPERATURE (°C)
TEMPERATURE (°C)
00701-011
VOLTAGE OUTPUT NONLINEARITY VS. TEMPERATURE
When using a voltage reference with data converters, it is
important to understand the impact that temperature drift can
have on converter performance. The nonlinearity of the reference
output drift represents additional error that cannot be easily
calibrated out of the overall system. To better understand the
impact such a drift can have on a data converter, refer to Figure 12,
where the measured drift characteristic is normalized to the
endpoint average drift. The residual drift error for the AD1582/
AD1583/AD1584/AD1585 of approximately 200 ppm demonstrates that these parts are compatible with systems that require
12-bit accurate temperature performance.
250
200
150
(ppm)
100
OUT
ΔV
50
0
–50
–50 –25 0 25 50 75 100
TEMPERATURE (° C)
Figure 12. Residual Drift Error
0701-012
Rev. H | Page 11 of 16
AD1582/AD1583/AD1584/AD1585
V
www.BDTIC.com/ADI
OUTPUT VOLTAGE HYSTERESIS
High performance industrial equipment manufacturers can
require the AD1582/AD1583/AD1584/AD1585 to maintain a
consistent output voltage error at 25°C after the references are
operated over the full temperature range. All references exhibit
a characteristic known as output voltage hysteresis; however, the
AD1582/AD1583/AD1584/AD1585 are 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 13 displays the distribution of the AD1582/AD1583/
AD1584/AD1585 output voltage hysteresis.
80
70
60
50
40
30
NUMBER OF PARTS
20
10
0
–700 –450 –200 50 300 550
Figure 13. Output Voltage Hysteresis Distribution
ppm
0701-013
SUPPLY CURRENT VS. TEMPERATURE
The quiescent current for the AD1582/AD1583/AD1584/
AD1585 varies slightly over temperature and input supply
range. Figure 14 illustrates the typical performance for the
AD1582/AD1583/AD1584/AD1585 reference when varying
both temperature and supply voltage. As is evident from
Figure 14, the AD1582/AD1583/AD1584/AD1585 supply
current increases only 1.0 µA/V, making this device extremely
attractive for use in applications where there can be wide
variations in supply voltage and a need to minimize power
dissipation.
100
80
60
(µA)
Q
I
40
20
0
34567891011
TA= +85°C
TA= –40°C
Figure 14. Typical Supply Current over Temperature
VIN(V)
TA= +25°C
00701-014
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
if negative voltage is inadvertently applied to V
ground, or any negative transient >5 V is coupled to V
and up to 12 V. However,
OUT
with respect to
IN
IN
, the
device can be damaged.
AC PERFORMANCE
To apply the AD1582/AD1583/AD1584/AD1585, it is important to understand the effects of dynamic output impedance
and power supply rejection. In Figure 15, a voltage divider
is formed by the AD1582/AD1583/AD1584/ AD1585 output
impedance and by the external source impedance. Figure 16
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 17 shows a test circuit used to measure PSRR,
and Figure 18 demonstrates the ability of the AD1582/AD1583/
AD1584/AD1585 to attenuate line voltage ripple.
DC
LOAD
±2V
OUT
10kΩ
10kΩ
±100µA
10kΩ
1µF
×1
2×V
Figure 15. Output Impedance Test Circuit
100
10
AD1585
AD1582
1
OUTPUT I MPEDANCE (Ω)
0.1
10
100
1k 10k 100k 1M
FREQUENCY (Hz)
Figure 16. Output Impedance vs. Frequency
10kΩ
10V
×1
±200mV
10kΩ
Figure 17. Ripple Rejection Test Circuit
5V ± 100mV
0.22µF
2kΩ
1µF CAP
DUT
5V
DUT
V
OUT
0.22µF
5µF
0701-015
0701-016
0701-017
Rev. H | Page 12 of 16
AD1582/AD1583/AD1584/AD1585
V
V
www.BDTIC.com/ADI
100
90
80
70
60
50
PSRR (dB)
40
30
20
10
0
110 100 1k 10k 100k
Figure 18. Ripple Rejection vs. Frequency
FREQUENCY (Hz)
AD1585
AD1582
1M
00701-018
NOISE PERFORMANCE AND REDUCTION
The noise generated by the AD1582/AD1583/AD1584/AD1585 is
typically less than 70 µV p-p over the 0.1 Hz to 10 Hz frequency
band. Figure 19 shows the 0.1 Hz to 10 Hz noise of a typical
AD1582/AD1583/AD1584/AD1585. 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 20 shows the
broadband noise of a typical AD1582/AD1583/AD1584/AD1585.
If further noise reduction is desired, add a 1-pole, low-pass
filter between the output pin and 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 V rms. It should be noted,
however, that while additional filtering on the output can
improve the noise performance of the AD1582/AD1583/
AD1584/AD1585, the added output impedance can degrade
the ac performance of the references.
10µV 1s
100
90
10
0%
100µV
100
90
10
0%
Figure 20. 1 Hz to 10 Hz Voltage Noise
TURN-ON TIME
Many low power instrument manufacturers are concerned
with the turn-on characteristics of the components used in their
systems. Fast turn-on components often enable the end user to
save power by keeping power off when 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 21 shows the
turn-on settling and transient response test circuit. Figure 22
shows the turn-on characteristics of the AD1582/AD1583/
AD1584/AD1585. These characteristics are generated from coldstart operation and represent the true turn-on waveform after
power-up. Figure 23 shows the fine settling characteristics of
the AD1582/AD1583/AD1584/AD1585. 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
Power supply resistance must be low enough to ensure reliable
turn-on. Fast power supply edges minimize this effect.
0
0V TO 10V
is slightly below the minimum specified level.
SUPPLY
OR 10
10kΩ
10kΩ
Figure 21. Turn-On/Transient Response Test Circuit
0.22µF
DUT
10ms
V
OUT
5V OR 10V
0V OR 5V
0.22µF
00701-020
00701-021
00701-019
Figure 19. 10 Hz to 10 kHz Wideband Noise
Rev. H | Page 13 of 16
AD1582/AD1583/AD1584/AD1585
www.BDTIC.com/ADI
100
100
5V
90
10
0%
1V
20µs
20µs
5V
100
90
10
0%
200mV
00701-022
50µs
50µs
00701-024
Figure 22. Turn-On Characteristics Figure 24. Line Transient Response
5V
90
10
0%
1mV 20µs
Figure 23. Turn-On Settling
20µs
5V
100
90
10
0%
5mV
00701-023
20µs
20µs
0701-025
Figure 25. Load Transient Response (0 mA to 5 mA Load)
DYNAMIC PERFORMANCE
Many ADCs and DACs present transient current loads to the
reference and poor reference response can degrade converter
performance. The AD1582/AD1583/AD1584/AD1585 provide
superior static and dynamic line and load regulation. Because
these series references are capable of both sourcing and sinking
large current loads, they exhibit excellent settling characteristics.
Figure 24 displays the line transient response for the AD1582/
AD1583/AD1584/AD1585. The circuit used to perform such
a measurement is shown in Figure 21, where the input supply
voltage is toggled from 5 V to 10 V, and the input and output
capacitors are each 0.22 F.
Figure 25 and Figure 26 show the load transient settling characteristics for the AD1582/AD1583/AD1584/AD1585 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 F and 1 F,
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 of less than 10 mV.
20µs
20µs
100
5V
90
10
0%
5mV
Figure 26. Load Transient Response (0 mA to −1 mA Load)
00701-026
Rev. H | Page 14 of 16
AD1582/AD1583/AD1584/AD1585
www.BDTIC.com/ADI
OUTLINE DIMENSIONS
3.04
2.90
1.40
1.30
1.20
PIN 1
0.10
0.01
Figure 27. 3-Lead Small Outline Transistor Package [SOT-23-3]
4.10
3.20
3.10
2.90
4.00
3.90
2.05
2.00
1.95
1.00 MIN
1.10
1.00
0.90
3.55
3.50
3.45
0.75 MIN
8.30
8.00
7.70
1.55
1.50
1.45
DIRECTION O F UNREELI NG
2.80
3
1
1.90 BSC
SEATING
PLANE
COMPLIANT TO JEDEC STANDARDS TO-236-AB
2
0.95 BSC
2.64
2.10
0.50
0.30
1.12
0.89
0.60
0.50
0.40
(RT-3)
Dimensions shown in millimeters
7” REEL 100.00
OR
13” REEL 330.00
1.50 MIN
2.80
2.70
2.60
1.10
1.00
0.90
0.35
0.30
0.25
20.20
MIN
Figure 28. SOT-23 Tape and Reel Outline Dimension
(RT-3)
Dimensions shown in millimeters
0.20
0.08
14.40 MIN
13.20
13.00
12.80
7” REEL 50.00 MIN
OR
13” REEL 100.00 MIN
9.90
8.40
6.90
053006-0
Rev. H | Page 15 of 16
AD1582/AD1583/AD1584/AD1585
www.BDTIC.com/ADI
ORDERING GUIDE
Output
Accuracy
(mV)
Model
Vol tage
(V)
AD1582ART-R2 2.50 20 0.80 100 SOT-23-3 RT-3 2A 250
AD1582ART-REEL7 2.50 20 0.80 100 SOT-23-3 RT-3 2A 3,000
AD1582ARTZ-R2
AD1582ARTZ-REEL7
2
2.50 20 0.80 100 SOT-23-3 RT-3 R1Z 250
2
2.50 20 0.80 100 SOT-23-3 RT-3 R1Z 3,000
AD1582BRT-R2 2.50 2 0.08 50 SOT-23-3 RT-3 2B 250
AD1582BRT-REEL7 2.50 2 0.08 50 SOT-23-3 RT-3 2B 3,000
2
AD1582BRTZ-REEL7
2.50 2 0.08 50 SOT-23-3 RT-3 R20 3,000
AD1583ART-R2 3.00 30 1.00 100 SOT-23-3 RT-3 3A 250
AD1583ART-REEL7 3.00 30 1.00 100 SOT-23-3 RT-3 3A 3,000
AD1583ARTZ-R2
AD1583ARTZ-REEL7
2
3.00 30 1.00 100 SOT-23-3 RT-3 R22 250
2
3.00 30 1.00 100 SOT-23-3 RT-3 R22 3,000
AD1583BRT-R2 3.00 3 0.10 50 SOT-23-3 RT-3 3B 250
AD1583BRT-REEL7 3.00 3 0.10 50 SOT-23-3 RT-3 3B 3,000
AD1583BRTZ-REEL7
2
3.00 3 0.10 50 SOT-23-3 RT-3 R23 3,000
AD1584ART-R2 4.096 40 0.98 100 SOT-23-3 RT-3 4A 250
AD1584ART-REEL7 4.096 40 0.98 100 SOT-23-3 RT-3 4A 3,000
AD1584ARTZ-R2
AD1584ARTZ-REEL7
2
4.096 40 0.98 100 SOT-23-3 RT-3 R25 250
2
4.096 40 0.98 100 SOT-23-3 RT-3 R25 3,000
AD1584BRT-R2 4.096 4 0.10 50 SOT-23-3 RT-3 4B 250
AD1584BRT-REEL7 4.096 4 0.10 50 SOT-23-3 RT-3 4B 3,000
AD1584BRTZ-REEL7
2
4.096 4 0.10 50 SOT-23-3 RT-3 R26 3,000
AD1585ART-R2 5.00 50 1.00 100 SOT-23-3 RT-3 5A 250
AD1585ART-REEL7
AD1585ARTZ-R2
AD1585ARTZ-REEL7
2
5.00 50 1.00 100 SOT-23-3 RT-3 5A 3,000
2
5.00 50 1.00 100 SOT-23-3 RT-3 R28 250
2
5.00 50 1.00 100 SOT-23-3 RT-3 R28 3,000
AD1585BRT-R2 5.00 5 0.10 50 SOT-23-3 RT-3 5B 250
AD1585BRT-REEL7 5.00 5 0.10 50 SOT-23-3 RT-3 5B 3,000
AD1585BRTZ-REEL7
1
See Package Branding Information section.
2
Z = RoHS Compliant Part.
2
5.00 5 0.10 50 SOT-23-3 RT-3 R29 3,000
PACKAGE BRANDING INFORMATION
This branding information is only for nonPb-free versions. 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 to Z to represent a two-week window starting with “A” for
the first two weeks of January.
Initial
Accuracy
(%)
Initial Temp.
Coefficient
(ppm/°C)
Package
Description
Package
Option
Branding
No. of Parts
Banding
1
per Reel
©1997–2007 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D00701-0-11/07(H)
Rev. H | Page 16 of 16
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