AD1585ARTZRL7 [ADI]
IC 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 5 V, PDSO3, SOT-23, 3 PIN, Voltage Reference;
| 型号： | AD1585ARTZRL7 |
| 厂家： | 
ADI |
| 描述： | IC 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 5 V, PDSO3, SOT-23, 3 PIN, Voltage Reference 光电二极管 输出元件 |
| 文件： | 总12页 (文件大小：167K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
2.5 V to 5.0 V Micropower, Precision
Series Mode Voltage References
a
AD1582/AD1583/AD1584/AD1585
FUNCTIONAL BLOCK DIAGRAM
FEATURES
Series Reference (2.5 V, 3 V, 4.096 V, 5 V)
Initial Accuracy: ؎0.1% max
1
2
V
Temperature Drift: ؎50 ppm/؇C max
Low Quiescent Current: 65 A max
Current Output Capability: ؎5 mA
Wide Supply Range: VIN = VOUT + 200 mV to 12 V
Wideband Noise (10 Hz–10 kHz): 50 V rms
Operating Temperature Range: –40؇C to +85؇C
Compact, Surface-Mount, SOT-23 Package
OUT
3
V
IN
GND
AD1582/3/4/5
TOP VIEW
GENERAL DESCRIPTION
TARGET APPLICATIONS
The AD1582, AD1583, AD1584 and AD1585 are a family of
low cost, low power, low dropout, precision bandgap references.
These designs are available as three-terminal (series) devices and
are packaged in the compact SOT-23, 3-pin, 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.
1. Portable, Battery Powered Equipment. Notebook Comput-
ers, 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.
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 have
been used to minimize the nonlinearities in the voltage output
temperature characteristic.
6. Hard Disk Drives.
7. 3 V/5 V 8-Bit–12-Bit Data Converters.
900
800
700
600
These series mode devices (AD1582/AD1583/AD1584/AD1585)
will source or sink up to 5 mA of load current and operate
efficiently with only 200 mV of required headroom. This family
will draw a maximum 65 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.
SHUNT REFERENCE*
500
400
300
200
100
AD1582 SERIES REFERENCE
The AD1582, AD1583, AD1584 and AD1585 are available in
two grades, A and B, both of which are provided in the smallest
available package on the market, the SOT-23. Both grades are
specified over the industrial temperature range of –40°C to
+85°C.
0
2.7
5
V
– V
SUPPLY
*3.076k⍀ SOURCE RESISTOR
Figure 1. Supply Current (µA) vs. Supply Voltage (V)
REV. A
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
World Wide Web Site: http://www.analog.com
© Analog Devices, Inc., 2000
AD1582/AD1583/AD1584/AD1585
(@ TA = TMIN–TMAX, VIN = 5 V, unless otherwise noted)
AD1582–SPECIFICATIONS
Model
AD1582A
Typ
AD1582B
Typ
Min
Max
2.52
100
Min
Max
2.502
50
Units
V
OUTPUT VOLTAGE (@ +25°C)
OUTPUT VOLTAGE TEMPERATURE DRIFT1
2.48
2.50
2.498
2.500
ppm/°C
MINIMUM SUPPLY HEADROOM (VIN–VOUT
With IOUT = 1 mA
)
200
200
mV
LOAD REGULATION
0 mA < IOUT < 5 mA
–5 mA < IOUT < 0 mA
200
250
200
250
µV/mA
µV/mA
LOAD REGULATION
–100 µA < IOUT < 100 µA
2
2
mV/mA
LINE REGULATION
VOUT +200 mV < VIN < 12 V
IOUT = 0 mA
25
25
µV/V
RIPPLE REJECTION (∆VOUT/∆VIN)
VIN = 5 V 100 mV (f = 120 Hz)2
80
80
dB
µA
QUIESCENT CURRENT
65
15
65
15
SHORT CIRCUIT CURRENT TO GROUND
mA
NOISE VOLTAGE (@ +25°C)
0.1 Hz to 10 Hz
10 Hz to 10 kHz
70
50
70
50
µV p-p
µV rms
TURN-ON SETTLING TIME TO 0.1%3
100
100
µs
LONG-TERM STABILITY
1000 Hours @ +25°C4
100
115
100
115
ppm/1000 hrs.
ppm
OUTPUT VOLTAGE HYSTERESIS5
TEMPERATURE RANGE
Specified Performance (A, B)
Operating Performance (A, B)6
–40
–55
+85
+125
–40
–55
+85
+125
°C
°C
NOTES
1Maximum output voltage drift is guaranteed for all grades.
2Ripple Rejection over a wide frequency spectrum is shown in Figure 15.
3Measured with a capacitance load of 0.2 µF.
4Long-term stability at +125°C = 1600 ppm/1000 hours.
5Hysteresis is defined as the change in the 25°C output voltage, caused by bringing the device to +85°C, taking a 25°C measurement and then bringing it to –40°C, followed
by another 25°C measurement. Refer to Figure 12.
6The operating temperature range is defined as the temperature extremes at which the device will still function. Parts may deviate from their specified performance outside
the specified temperature range.
Specifications subject to change without notice.
REV. A
–2–
AD1582/AD1583/AD1584/AD1585
(@ TA = TMIN–TMAX, VIN = 5 V, unless otherwise noted)
AD1583–SPECIFICATIONS
Model
AD1583A
Typ
AD1583B
Typ
Min
Max
3.03
100
Min
Max
3.003
50
Units
V
OUTPUT VOLTAGE (@ +25°C)
OUTPUT VOLTAGE TEMPERATURE DRIFT1
2.97
3.00
2.997
3.000
ppm/°C
MINIMUM SUPPLY HEADROOM (VIN–VOUT
With IOUT = 1 mA
)
200
200
mV
LOAD REGULATION
0 mA < IOUT < 5 mA
–5 mA < IOUT < 0 mA
250
400
250
400
µV/mA
µV/mA
LOAD REGULATION
–100 µA < IOUT < 100 µA
2.4
25
2.4
25
mV/mA
LINE REGULATION
VOUT +200 mV < VIN < 12 V
IOUT = 0 mA
µV/V
RIPPLE REJECTION (∆VOUT/∆VIN)
VIN = 5 V 100 mV (f = 120 Hz)2
80
80
dB
µA
QUIESCENT CURRENT
65
15
65
15
SHORT CIRCUIT CURRENT TO GROUND
mA
NOISE VOLTAGE (@ +25°C)
0.1 Hz to 10 Hz
10 Hz to 10 kHz
85
60
85
60
µV p-p
µV rms
TURN-ON SETTLING TIME TO 0.1%3
120
120
µs
LONG-TERM STABILITY
1000 Hours @ +25°C
OUTPUT VOLTAGE HYSTERESIS4
100
115
100
115
ppm/1000 hrs.
ppm
TEMPERATURE RANGE
Specified Performance (A, B)
Operating Performance (A, B)5
–40
–55
+85
+125
–40
–55
+85
+125
°C
°C
NOTES
1Maximum output voltage drift is guaranteed for all grades.
2Ripple Rejection over a wide frequency spectrum is shown in Figure 15.
3Measured with a capacitance load of 0.2 µF.
4Hysteresis is defined as the change in the 25°C output voltage, caused by bringing the device to +85°C, taking a 25°C measurement and then bringing it to –40°C, followed
by another 25°C measurement. Refer to Figure 12.
5The operating temperature range is defined as the temperature extremes at which the device will still function. Parts may deviate from their specified performance outside
the specified temperature range.
Specifications subject to change without notice.
REV. A
–3–
AD1582/AD1583/AD1584/AD1585
(@ TA = TMIN–TMAX, VIN = 5 V, unless otherwise noted)
AD1584–SPECIFICATIONS
Model
AD1584A
Typ
AD1584B
Typ
Min
Max
4.136
100
Min
Max
4.100
50
Units
V
OUTPUT VOLTAGE (@ +25°C)
OUTPUT VOLTAGE TEMPERATURE DRIFT1
4.056
4.096
4.092
4.096
ppm/°C
MINIMUM SUPPLY HEADROOM (VIN–VOUT
With IOUT = 1 mA
)
200
200
mV
LOAD REGULATION
0 mA < IOUT < 5 mA
–5 mA < IOUT < 0 mA
320
320
320
320
µV/mA
µV/mA
LOAD REGULATION
–100 µA < IOUT < 100 µA
3.2
25
3.2
25
mV/mA
LINE REGULATION
VOUT +200 mV < VIN < 12 V
IOUT = 0 mA
µV/V
RIPPLE REJECTION (∆VOUT/∆VIN)
VIN = 5 V 100 mV (f = 120 Hz)2
80
80
dB
µA
QUIESCENT CURRENT
65
15
65
15
SHORT CIRCUIT CURRENT TO GROUND
mA
NOISE VOLTAGE (@ +25°C)
0.1 Hz to 10 Hz
10 Hz to 10 kHz
110
90
110
90
µV p-p
µV rms
TURN-ON SETTLING TIME TO 0.1%3
140
140
µs
LONG-TERM STABILITY
1000 Hours @ +25°C
OUTPUT VOLTAGE HYSTERESIS4
100
115
100
115
ppm/1000 hrs.
ppm
TEMPERATURE RANGE
Specified Performance (A, B)
Operating Performance (A, B)5
–40
–55
+85
+125
–40
–55
+85
+125
°C
°C
NOTES
1Maximum output voltage drift is guaranteed for all grades.
2Ripple Rejection over a wide frequency spectrum is shown in Figure 15.
3Measured with a capacitance load of 0.2 µF.
4Hysteresis is defined as the change in the 25°C output voltage, caused by bringing the device to +85°C, taking a 25°C measurement and then bringing it to –40°C, followed
by another 25°C measurement. Refer to Figure 12.
5The operating temperature range is defined as the temperature extremes at which the device will still function. Parts may deviate from their specified performance outside
the specified temperature range.
Specifications subject to change without notice.
REV. A
–4–
AD1582/AD1583/AD1584/AD1585
(@ TA = TMIN–TMAX, VIN = 6 V, unless otherwise noted)
AD1585–SPECIFICATIONS
Model
AD1585A
Typ
AD1585B
Typ
Min
Max
5.05
100
Min
Max
5.005
50
Units
V
OUTPUT VOLTAGE (@ +25°C)
OUTPUT VOLTAGE TEMPERATURE DRIFT1
4.95
5.00
4.995
5.000
ppm/°C
MINIMUM SUPPLY HEADROOM (VIN–VOUT
With IOUT = 1 mA
)
200
200
mV
LOAD REGULATION
0 mA < IOUT < 5 mA
–5 mA < IOUT < 0 mA
400
400
400
400
µV/mA
µV/mA
LOAD REGULATION
–100 µA < IOUT < 100 µA
4
4
mV/mA
LINE REGULATION
VOUT +200 mV < VIN < 12 V
IOUT = 0 mA
25
25
µV/V
RIPPLE REJECTION (∆VOUT/∆VIN)
VIN = 6 V 100 mV (f = 120 Hz)2
80
80
dB
µA
QUIESCENT CURRENT
65
15
65
15
SHORT CIRCUIT CURRENT TO GROUND
mA
NOISE VOLTAGE (@ +25°C)
0.1 Hz to 10 Hz
10 Hz to 10 kHz
140
100
140
100
µV p-p
µV rms
TURN-ON SETTLING TIME TO 0.1%3
175
175
µs
LONG-TERM STABILITY
1000 Hours @ +25°C
OUTPUT VOLTAGE HYSTERESIS4
100
115
100
115
ppm/1000 hrs.
ppm
TEMPERATURE RANGE
Specified Performance (A, B)
Operating Performance (A, B)5
–40
–55
+85
+125
–40
–55
+85
+125
°C
°C
NOTES
1Maximum output voltage drift is guaranteed for all grades.
2Ripple Rejection over a wide frequency spectrum is shown in Figure 15.
3Measured with a capacitance load of 0.2 µF.
4Hysteresis is defined as the change in the 25°C output voltage, caused by bringing the device to +85°C, taking a 25°C measurement and then bringing it to –40°C, followed
by another 25°C measurement. Refer to Figure 12.
5The operating temperature range is defined as the temperature extremes at which the device will still function. Parts may deviate from their specified performance outside
the specified temperature range.
Specifications subject to change without notice.
REV. A
–5–
AD1582/AD1583/AD1584/AD1585
ABSOLUTE MAXIMUM RATINGS1
PACKAGE BRANDING INFORMATION
VIN to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 V
Four marking fields identify the device generic, grade and date
of processing. The first field is the product identifier. A “2/3/4/5”
identifies the generic as the AD1582/3/4/5. The second field
indicates the device grade; “A” or “B.” In the third field a
numeral or letter indicates the calendar year; “7” for 1997. . . ,
“A” for 2001. . . The fourth field uses letters A-Z to represent a
two week window within the calendar year, starting with “A” for
the first two weeks of January.
Internal Power Dissipation2
SOT-23 (RT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400 mW
Storage Temperature Range . . . . . . . . . . . . –65°C to +125°C
Operating Temperature Range
AD1582/AD1583/AD1584/AD1585RT . . . –40°C to +85°C
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . .+215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+220°C
NOTES
1Stresses 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.
2Specification is for device in free air at 25°C: SOT-23 Package: θJA = 300°C/W.
ORDERING GUIDE
Initial Output
Error
Temperature
Coefficient
Model1
AD1582/AD1583/AD1584/AD1585ART
AD1582/AD1583/AD1584/AD1585ARTRL2
AD1582/AD1583/AD1584/AD1585ARTRL73
AD1582/AD1583/AD1584/AD1585BRT
AD1582/AD1583/AD1584/AD1585BRTRL2
AD1582/AD1583/AD1584/AD1585BRTRL73
1.0%
1.0%
1.0%
0.1%
0.1%
0.1%
100 ppm/°C
100 ppm/°C
100 ppm/°C
50 ppm/°C
50 ppm/°C
50 ppm/°C
NOTES
1Package Option for all Models; RT = Surface Mount, SOT-23.
2Provided on a 13-inch reel containing 10,000 pieces.
3Provided on a 7-inch reel containing 3,000 pieces.
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.
REV. A
–6–
Typical Performance Characteristics–
AD1582/AD1583/AD1584/AD1585
0.40
0.35
0.30
22
20
18
16
14
12
10
8
1585
0.25
0.20
1582
0.15
0.10
0.05
0
6
4
2
0
0
2
4
6
8
10
12
–60 –50 –40 –30 –20 –10
0
10
20 30
50
40
ppm/؇C
V
– Volts
IN
Figure 2. Typical Output Voltage Temperature Drift
Distribution
Figure 5. Load Regulation vs. VIN
50
45
40
35
30
25
20
15
10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
1582
1585
5
0
–100%
–0.60%
–0.20%
0.20%
– ERROR
0.60%
1.00%
–5
–4
–3
–2
–1
0
1
2
3
4
5
V
I
– mA
OUT
OUT
Figure 3. Typical Output Voltage Error Distribution
Figure 6. Line Regulation vs. ILOAD
1E+04
2.510
2.508
2.506
2.504
2.502
2.500
2.498
2.496
2.494
2.492
I
= 1mA
OUT
I
= 0
OUT
1E+03
1E+02
1E+01
1E+05
–60
–40
–20
0
20
40
60
80
100
120
1E+02
1E+03
FREQUENCY – Hz
1E+04
TEMPERATURE – ؇C
Figure 4. Typical Temperature Drift Characteristic Curves
Figure 7. Noise Spectral Density
REV. A
–7–
AD1582/AD1583/AD1584/AD1585
THEORY OF OPERATION
The AD1582/AD1583/AD1584/AD1585 family uses the
“bandgap” concept to produce stable, low temperature coeffi-
cient voltage references suitable for high accuracy data acquisi-
tion components and systems. This family of precision references
makes use of 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 VBE that, when
extrapolated to absolute zero, 0°K, (with collector current propor-
tional to absolute temperature) approximates the silicon bandgap
voltage. By summing a voltage that has an equal and opposite
temperature coefficient of +2 mV/°C with the VBE of a forward-
biased transistor, a zero TC reference can be developed. In the
AD1582/AD1583/AD1584/AD1585 simplified circuit diagram
shown in Figure 8, such a compensating voltage, V1, is derived
by driving two transistors at different current densities and
amplifying the resultant VBE difference (∆VBE—which has a
positive TC). The sum (VBG) of VBE and V1 is then buffered
and amplified to produce stable reference voltage outputs of
2.5 V, 3 V, 4.096 V, and 5 V.
+
1
2
3
V
V
1F
IN
OUT
4.7F
–
Figure 9. 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.
Some confusion exists, however, in the area of defining and
specifying reference voltage error over temperature. Historically,
references have been characterized using a maximum deviation
per degree centigrade, i.e., 50 ppm/°C. However, because of the
inconsistent nonlinearities in standard zener references (such as
“S” type characteristics), most manufacturers use a maximum
limit error band approach to characterize their references. Using
this technique, the voltage reference output voltage error band is
specified by taking output voltage measurements at three or
more different temperatures.
V
IN
R3
R4
V
OUT
The error band guaranteed with the AD1582/AD1583/AD1584/
AD1585 family is the maximum deviation from the initial value
at +25°C; this method is of more use to a designer than the one
which simply guarantees the maximum error band over the
entire temperature change. 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
+85°C).
R5
V
BG
+
V
R2
–
BE
R6
+
V1
–
R1
GND
Figure 8. Simplified Schematic
APPLYING THE AD1582/AD1583/AD1584/AD1585
Figure 10 shows the typical output voltage drift for the AD1582
and illustrates the methodology. The box in Figure 10 is bounded
on the x-axis by operating temperature extremes, and 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 +85°C and –40°C determines the performance grade
of the device.
The AD1582/AD1583/AD1584/AD1585 is a family of series
references that can be utilized for many applications. To achieve
optimum performance with these references, only two external
components are required. Figure 9 shows the AD1582 config-
ured 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 will achieve specified perfor-
mance 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. While a 1 µF output capacitor will provide stable
performance for all loading conditions, the AD1582 can operate
under low (–100 µA < I OUT < 100 µA) current conditions with
just a 0.2 µF output capacitor. The 4.7 µF capacitor on the input
can be reduced to 1 µF in this condition.
Duplication of these results requires a test system that is highly
accurate with stable temperature control. Evaluation of the
AD1582 will produce curves similar to those in Figures 4 and
10, but output readings may vary depending upon the test
methods and test equipment utilized.
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 9, these devices can be applied to
any circuit and provide superior low power solutions.
REV. A
–8–
AD1582/AD1583/AD1584/AD1585
2.510
2.509
2.508
2.507
2.506
2.505
2.504
2.503
2.502
2.501
hysteresis, the AD1582/AD1583/AD1584/AD1585 family
is designed to minimize this characteristic. This phenom-
enon can be quantified by measuring the change in the
+25°C output voltage after temperature excursions from
+85°C to +25°C, and –40°C to +25°C. Figure 12 displays
the distribution of the AD1582 output voltage hysteresis.
80
70
60
50
40
30
20
10
0
–60
–40
–20
0
20
40
60
80
100 120
TEMPERATURE – ؇C
Figure 10. Output Voltage vs. Temperature
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 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 under-
stand the impact such a drift can have on a data converter, refer
to Figure 11 where the measured drift characteristic is normal-
ized to the end point 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.
–700
–450
–200
50
ppm
300
550
Figure 12. Output Voltage Hysteresis Distribution
SUPPLY CURRENT VS. TEMPERATURE
The quiescent current for the AD1582/AD1583/AD1584/
AD1585 family of references will vary slightly over tempera-
ture and input supply range. Figure 13 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 applica-
tions where there may be wide variations in supply voltage
and a need to minimize power dissipation.
250
200
150
100
50
100
80
T
= 85؇C
T
= 25؇C
A
A
60
40
20
0
0
–50
–50
–25
0
25
50
75
100
T
= –40؇C
A
TEMPERATURE – ؇C
Figure 11. Residual Drift Error
OUTPUT VOLTAGE HYSTERESIS
3
4
5
6
7
8
9
10
11
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
V
– Volts
IN
Figure 13. Typical Supply Current over Temperature
REV. A
–9–
AD1582/AD1583/AD1584/AD1585
100
90
80
70
60
50
40
30
20
10
0
AC PERFORMANCE
To successfully 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 14a, a voltage divider is formed by the AD1582’s output
impedance and the external source impedance. Figure 14b
shows the effect of varying the load capacitor on the reference
output. Power supply rejection ratio (PSRR) should be deter-
mined when characterizing the ac performance of a series
voltage reference. Figure 15a shows a test circuit used to
measure PSRR, and Figure 15b demonstrates the AD1582’s
ability to attenuate line voltage ripple.
1582
1585
V
DC
1.E+00 1.E+01
1.E+02
1.E+03
1.E+04
1.E+05
1.E+06
LOAD
5V
FREQUENCY – Hz
2k⍀
10k⍀
10k⍀
Figure 15b. Ripple Rejection vs. Frequency
2X V
10k⍀
OUT
5F
X1
DUT
؎100A
1F
NOISE PERFORMANCE AND REDUCTION
؎2V
The noise generated by the AD1582 is typically less then
70 µV p-p over the 0.1 Hz to 10 Hz frequency band. Figure 16
shows the 0.1 Hz to 10 Hz noise of a typical AD1582. The noise
measurement is made with a high gain bandpass filter. Noise in
a 10 Hz to 10 kHz region is approximately 50 µV rms. Figure 17
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 ground. A time constant of 0.2 ms
will have a –3 dB point at roughly 800 Hz, and will reduce 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.
Figure 14a. Output Impedance Test Circuit
100
1F CAP
10
1585
1582
1
10V
1s
0.1
100
90
1E+01
1E+02
1E+03
FREQUENCY – Hz
1E+04
1E+05
1E+06
Figure 14b. Output Impedance vs. Frequency
10k⍀
10
0%
10V
5V ؎100mV
X1
V
0.22F
OUT
10k⍀
DUT
؎200mV
0.22F
Figure 16. 0.1–10 Hz Voltage Noise
Figure 15a. Ripple Rejection Test Circuit
100V
10ms
100
90
10
0%
Figure 17. 10 Hz to 10 kHz Wideband Noise
REV. A
–10–
AD1582/AD1583/AD1584/AD1585
TURN-ON TIME
DYNAMIC PERFORMANCE
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 compo-
nents 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 18a shows the turn-on settling and transient
response test circuit. Figure 18b displays the turn-on character-
istic of the AD1582. This characteristic is generated from cold-
start operation and represents the true turn-on waveform after
power up. Figure 18c shows the fine settling characteristics of
the AD1582. Typically, the reference settles to within 0.1% of
its final value in about 100 µs.
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 AD1582/3/4/5 family of refer-
ences has been designed to provide 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 19 displays the line transient response for the AD1582.
The circuit utilized to perform such a measurement is displayed
in Figure 18a, 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 20 and 21 show the load transient settling characteris-
tics 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.
The device can momentarily draw excessive supply current
when VSUPPLY is slightly below the minimum specified level.
Power supply resistance must be low enough to ensure reliable
turn-on. Fast power supply edges minimize this effect.
10k⍀
5V
50s
5V OR 10V
0V OR 5V
0V OR 10V
0V TO 10V
100
90
X1
0.22F
V
OUT
10k⍀
DUT
0.22F
Figure 18a. Turn-On/Transient Response Test Circuit
10
0%
200mV
50s
5V
20s
Figure 19. Line Transient Response
100
90
5V
20s
100
90
10
0%
1V
20s
Figure 18b. Turn-On Characteristics
10
0%
5mV
20s
5V
20s
Figure 20. Load Transient Response (0 mA to 5 mA Load)
100
90
20s
5V
100
90
10
0%
1mV
20s
Figure 18c. Turn-On Settling
10
0%
5mV
20s
Figure 21. Load Transient Response
(0 mA to –1 mA Load)
REV. A
–11–
AD1582/AD1583/AD1584/AD1585
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
Surface Mount Package
SOT-23
0.1200 (3.048)
0.1102 (2.799)
3
0.1040 (2.642)
0.0827 (2.101)
0.055 (1.397)
0.0470 (1.194)
1
2
PIN 1
0.0236 (0.599)
0.0177 (0.450)
0.0413 (1.049)
0.0374 (0.950)
0.0807 (2.050)
0.0701 (1.781)
0.0059 (0.150)
0.0034 (0.086)
0.0440 (1.118)
0.0320 (0.813)
0.0040 (0.102)
0.0005 (0.013)
0.0210 (0.533)
0.0146 (0.371)
0.0100 (0.254)
0.0050 (0.127)
0.027 (0.686)
REF
SEATING
PLANE
TAPE AND REEL DIMENSIONS
Dimensions shown in millimeters.
1.8 ؎ 0.1
14.4 MAX
0.30
؎ 0.05
+0.05
–0.00
4.0 ؎ 0.10
1.5 MIN
1.5
2.0 ؎ 0.05
2.7
؎ 0.1
1.75
؎ 0.10
180 (7")
OR
330 (13")
50 (7" REEL) MIN
OR
100 (13" REEL) MIN
13.0
؎ 0.2
20.2
MIN
3.5
؎ 0.05
8.0
؎ 0.30
0.75
MIN
3.1 ؎ 0.1
DIRECTION OF UNREELING
1.0 MIN
+1.5
–0.0
8.4
–12–
REV. A
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