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2.5 V to 5.0 V Micropower, Precision Series Mode Voltage References AD1582/AD1583/AD1584/AD1585
FEATURES
Series reference (2.5 V, 3 V, 4.096 V, 5 V) Low quiescent current: 70 A maximum Current output capability: 5 mA Wide supply range: VIN = VOUT + 200 mV to 12 V Wideband noise (10 Hz to 10 kHz): 50 V rms Specified temperature range: -40C to +125C Compact, surface-mount SOT-23 package
PIN CONFIGURATION
VOUT 1
AD1582/ AD1583/ AD1584/ AD1585
TOP VIEW (Not to Scale)
3
VIN
00701-001
GND 2
Figure 1. 3-Lead SOT-23-3 (RT Suffix)
900 800 700 600
ISUPPLY (A)
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
500 400 300 200 100 0 2.7
SHUNT REFERENCE 1
AD1582 SERIES REFERENCE 5 SOURCE RESISTOR.
13.076k
Figure 2. Supply Current (A) vs. Supply Voltage (V)
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. 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 A of quiescent current with only a 1.0 A/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 SOT23. All grades are specified over the industrial temperature range of -40C to +125C. Table 1. AD158x Products, Three Electrical Grades
Initial Accuracy Electrical Grade B A AD1582 0.08% 0.80% AD1583/AD1585 0.10% 1.00% AD1584 0.10% 0.98% Temperature Coefficient (ppmC) 50 100
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.
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 (c)1997-2007 Analog Devices, Inc. All rights reserved.
00701-002
VSUPPLY (V)
AD1582/AD1583/AD1584/AD1585 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 SPECIFICATIONS
AD1582 SPECIFICATIONS
TA = TMIN to TMAX, VIN = 5 V, unless otherwise noted. Table 2.
Parameter OUTPUT VOLTAGE (@ 25C) VO INITIAL ACCURACY ERROR (@ 25C) VOERR OUTPUT VOLTAGE TEMPERATURE DRIFT TEMPERATURE COEFFICIENT (TCVO) -40C < TA < +125C 0C < TA < 70C MINIMUM SUPPLY HEADROOM (VIN - VOUT) LOAD REGULATION 0 mA < IOUT < 5 mA (-40C to +85C) 0 mA < IOUT < 5 mA (-40C to +125C) -5 mA < IOUT < 0 mA (-40C to +85C) -5 mA < IOUT < 0 mA (-40C to +125C) -0.1 mA < IOUT < +0.1 mA (-40C to +85C) -0.1 mA < IOUT < +0.1 mA (-40C to +125C) LINE REGULATION VOUT + 200 mV < VIN < 12 V IOUT = 0 mA RIPPLE REJECTION (VOUT/VIN) VIN = 5 V 100 mV (f = 120 Hz) QUIESCENT CURRENT SHORT-CIRCUIT CURRENT TO GROUND NOISE VOLTAGE (@ 25C) 0.1 Hz to 10 Hz 10 Hz to 10 kHz TURN-ON SETTLING TIME TO 0.1% CL = 0.2 F LONG-TERM STABILITY 1000 Hours @ 25C OUTPUT VOLTAGE HYSTERESIS TEMPERATURE RANGE Specified Performance (A, B, C) Operating Performance (A, B, C) Min 2.480 -20 -0.80 AD1582A Typ Max 2.500 2.520 +20 +0.80 100 40 35 200 0.2 0.4 0.25 0.45 2.7 3.5 100 200 0.2 0.4 0.25 0.45 2.7 3.5 Min 2.498 -2 -0.08 AD1582B Typ Max 2.500 2.502 +2 +0.08 50 18 15 50 Unit V mV % ppm/C ppm/C ppm/C mV mV/mA mV/mA mV/mA mV/mA mV/mA mV/mA
25 80 70 15 70 50 100 100 115 -40 -55 +125 +125 -40 -55 100 115 70 50 80
25
V/V dB A mA V p-p V rms
70 15
100
s ppm/1000 hr ppm
+125 +125
C C
Rev. H | Page 3 of 16
AD1582/AD1583/AD1584/AD1585
AD1583 SPECIFICATIONS
TA = TMIN to TMAX, VIN = 5 V, unless otherwise noted. Table 3.
Parameter OUTPUT VOLTAGE (@ 25C) VO INITIAL ACCURACY ERROR (@ 25C) VOERR OUTPUT VOLTAGE TEMPERATURE DRIFT TEMPERATURE COEFFICIENT (TCVO) -40C < TA < +125C 0C < TA < 70C MINIMUM SUPPLY HEADROOM (VIN - VOUT) LOAD REGULATION 0 mA < IOUT < 5 mA (-40C to +85C) 0 mA < IOUT < 5 mA (-40C to +125C) -5 mA < IOUT < 0 mA (-40C to +85C) -5 mA < IOUT < 0 mA (-40C to +125C) -0.1 mA < IOUT < +0.1 mA (-40C to +85C) -0.1 mA < IOUT < +0.1 mA (-40C to +125C) LINE REGULATION VOUT + 200 mV < VIN < 12 V IOUT = 0 mA RIPPLE REJECTION (VOUT/VIN) VIN = 5 V 100 mV (f = 120 Hz) QUIESCENT CURRENT SHORT-CIRCUIT CURRENT TO GROUND NOISE VOLTAGE (@ 25C) 0.1 Hz to 10 Hz 10 Hz to 10 kHz TURN-ON SETTLING TIME TO 0.1% CL = 0.2 F LONG-TERM STABILITY 1000 Hours @ 25C OUTPUT VOLTAGE HYSTERESIS TEMPERATURE RANGE Specified Performance (A, B, C) Operating Performance (A, B, C) Min 2.970 -30 -1.0 AD1583A Typ Max 3.000 3.030 +30 +1.0 100 40 35 200 0.25 0.45 0.40 0.6 2.9 3.7 100 200 0.25 0.45 0.40 0.6 2.9 3.7 Min 2.997 -3 -0.1 AD1583B Typ Max 3.000 3.003 +3 +0.1 50 18 15 50 Unit V mV % ppm/C ppm/C ppm/C mV mV/mA mV/mA mV/mA mV/mA mV/mA mV/mA
25 80 70 15 85 60 120 100 115 -40 -55 +125 +125 -40 -55 100 115 85 60 80
25
V/V dB A mA V p-p V rms
70 15
120
s ppm/1000 hr ppm
+125 +125
C C
Rev. H | Page 4 of 16
AD1582/AD1583/AD1584/AD1585
AD1584 SPECIFICATIONS
TA = TMIN to TMAX, VIN = 5 V, unless otherwise noted. Table 4.
Parameter OUTPUT VOLTAGE (@ 25C) VO INITIAL ACCURACY ERROR (@ 25C) VOERR OUTPUT VOLTAGE TEMPERATURE DRIFT TEMPERATURE COEFFICIENT (TCVO) -40C < TA < +125C 0C < TA < 70C MINIMUM SUPPLY HEADROOM (VIN - VOUT) LOAD REGULATION 0 mA < IOUT < 5 mA (-40C to +85C) 0 mA < IOUT < 5 mA (-40C to +125C) -5 mA < IOUT < 0 mA (-40C to +85C) -5 mA < IOUT < 0 mA (-40C to +125C) -0.1 mA < IOUT < +0.1 mA (-40C to +85C) -0.1 mA < IOUT < +0.1 mA (-40C to +125C) LINE REGULATION VOUT + 200 mV < VIN 12 V IOUT = 0 mA RIPPLE REJECTION (VOUT/VIN) VIN = 5 V 100 mV (f = 120 Hz) QUIESCENT CURRENT SHORT-CIRCUIT CURRENT TO GROUND NOISE VOLTAGE (@ 25C) 0.1 Hz to 10 Hz 10 Hz to 10 kHz TURN-ON SETTLING TIME TO 0.1% CL = 0.2 F LONG-TERM STABILITY 1000 Hours @ 25C OUTPUT VOLTAGE HYSTERESIS TEMPERATURE RANGE Specified Performance (A, B, C) Operating Performance (A, B, C) Min 4.056 -40 -0.98 AD1584A Typ Max 4.096 4.136 +40 +0.98 100 40 35 200 0.32 0.52 0.40 0.6 3.2 4.1 100 200 0.32 0.52 0.40 0.6 3.2 4.1 Min 4.092 -4 -0.1 AD1584B Typ Max 4.096 4.100 +4 +0.1 50 18 15 50 Unit V mV % ppm/C ppm/C ppm/C mV mV/mA mV/mA mV/mA mV/mA mV/mA mV/mA
25 80 70 15 110 90 140 100 115 -40 -55 +125 -125 -40 -55 100 115 110 90 80
25
V/V dB A mA V p-p V rms
70 15
140
s ppm/1000 hr ppm
+125 +125
C C
Rev. H | Page 5 of 16
AD1582/AD1583/AD1584/AD1585
AD1585 SPECIFICATIONS
@ TA = TMIN to TMAX, VIN = 6 V, unless otherwise noted. Table 5.
Parameter OUTPUT VOLTAGE (@ 25C) VO INITIAL ACCURACY ERROR (@ 25C) VOERR OUTPUT VOLTAGE TEMPERATURE DRIFT TEMPERATURE COEFFICIENT (TCVO) -40C < TA < 125C 0C < TA < 70C MINIMUM SUPPLY HEADROOM (VIN - VOUT) LOAD REGULATION 0 mA < IOUT < 5 mA (-40C to +85C) 0 mA < IOUT < 5 mA (-40C to +125C) -5 mA < IOUT < 0 mA (-40C to +85C) -5 mA < IOUT < 0 mA (-40C to +125C) -0.1 mA < IOUT < +0.1 mA (-40C to +85C) -0.1 mA < IOUT < +0.1 mA (-40C to +125C) LINE REGULATION VOUT + 200 mV < VIN < 12 V IOUT = 0 mA RIPPLE REJECTION (VOUT/VIN) VIN = 6 V 100 mV (f = 120 Hz) QUIESCENT CURRENT SHORT-CIRCUIT CURRENT TO GROUND NOISE VOLTAGE (@ 25C) 0.1 Hz to 10 Hz 10 Hz to 10 kHz TURN-ON SETTLING TIME TO 0.1% CL = 0.2 F LONG-TERM STABILITY 1000 Hours @ 25C OUTPUT VOLTAGE HYSTERESIS TEMPERATURE RANGE Specified Performance (A, B, C) Operating Performance (A, B, C) Min 4.950 -50 -1.0 AD1585A Typ Max 5.000 5.050 +50 +1.0 100 40 35 200 0.40 0.6 0.40 0.6 4 4.8 100 200 0.40 0.6 0.40 0.6 4 4.8 Min 4.995 -5 -0.10 AD1585B Typ Max 5.000 5.005 +5 +0.10 50 18 15 50 Unit V mV % ppm/C ppm/C ppm/C mV mV/mA mV/mA mV/mA mV/mA mV/mA mV/mA
25 80 70 15 140 100 175 100 115 -40 -55 +125 +125 -40 -55 100 115 140 100 80
25
V/V dB A mA V p-p V rms
70 15
175
s ppm/1000 hr ppm
+125 +125
C C
Rev. H | Page 6 of 16
AD1582/AD1583/AD1584/AD1585 ABSOLUTE MAXIMUM RATINGS
Table 6.
Parameter VIN to Ground Internal Power Dissipation 1 SOT-23-3 (RT-3) Storage Temperature Range Specified Temperature Range AD1582RT/AD1583RT/ AD1584RT/AD1585RT Lead Temperature, Soldering Vapor Phase (60 sec) Infrared (15 sec)
1
Rating 12 V 400 mW 65C to 125C -40C to +125C
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
215C 220C
Specification is for device in free air at 25C; SOT-23 package, JA = 300C.
Rev. H | Page 7 of 16
AD1582/AD1583/AD1584/AD1585 TERMINOLOGY
Temperature Coefficient (TCVO) The change of output voltage over the operating temperature change and normalized by the output voltage at 25C, expressed in ppm/C. The equation follows Thermal Hysteresis (VO_HYS) The change of output voltage after the device is cycled through temperatures from +25C to -40C to +85C and back to +25C. This is a typical value from a sample of parts put through such a cycle
TCVO [ppm/C ] =
VO (25C ) x (T2 - T1 )
VO (T2 ) - VO (T1 )
x 10 6
VO _ HYS = VO (25C ) - VO _ TC VO _ HYS [ppm] = VO (25C ) - VO _ TC VO (25C ) x 10 6
where: VO (25C) = VO @ 25C. VO (T1) = VO @ Temperature 1. VO (T2) = VO @ Temperature 2. Line Regulation (VO/VIN) Definition 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/ILOAD) 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 (VO) Typical shift of output voltage at 25C on a sample of parts subjected to an operation life test of 1000 hours at 125C.
where: VO (25C) = VO at 25C. VO_TC = VO at 25C after temperature cycle at +25C to -40C to +85C and back to +25C. Operating Temperature The temperature extremes at which the device can still function. Parts can deviate from their specified performance outside the specified temperature range.
VO = VO (t 0 ) - VO (t 1 )
VO [ppm] =
VO (t 0 ) - VO (t 1 ) VO (t 0 )
x10 6
where: VO (t0) = VO @25C at Time 0. VO (t1) = VO @ 25C after 1000 hours of operation at 125C.
Rev. H | Page 8 of 16
AD1582/AD1583/AD1584/AD1585 TYPICAL PERFORMANCE CHARACTERISTICS
22 20 18
NUMBER OF PARTS
0.40 0.35 0.30 AD1585 0.25
mV/mA
16 14 12 10 8 6 4 2
00701-003
0.20 0.15 0.10 0.05 0
AD1582
-50
-40
-30
-20
-10 0 ppm/C
10
20
30
40
50
0
2
4
6 VIN (V)
8
10
12
Figure 3. Typical Output Voltage Temperature Drift Distribution
50 45 40
NUMBER OF PARTS
Figure 6. Load Regulation vs. VIN
0 -10 -20 -30
V/V
35 30 25 20 15 10 5 -0.6% -0.2% 0.2% VOUT (ERROR) 0.6% 1.0%
00701-004
-40 AD1582 -50 -60 AD1585 -70 -80
00701-007
0 -1.0%
-90
-5
-4
-3
-2
-1
0 1 IOUT (mA)
2
3
4
5
Figure 4. Typical Output Voltage Error Distribution
2.504 2.502 2.500 2.498 2.496 2.494 2.492 2.490
00701-005
Figure 7. Line Regulation vs. ILOAD
10k
IOUT = 1mA
nV/ Hz
VOUT
1k
IOUT = 0mA
-20
0
20 40 60 TEMPERATURE (C)
80
100
120
10
100
1k FREQUENCY (Hz)
10k
100k
Figure 5. Typical Temperature Drift Characteristic Curves
Figure 8. Noise Spectral Density
Rev. H | Page 9 of 16
00701-008
2.488 -40
100
00701-006
0 -60
AD1582/AD1583/AD1584/AD1585 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 VBE that, when extrapolated 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 VBE of a forward-biased 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 VBE difference (VBE, which has a positive TC). The sum of VBE 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 R4 VIN
VOUT R5 VBG + VBE R2 - R1 + V1 - R6
00701-009
GND
Figure 9. Simplified Schematic
Rev. H | Page 10 of 16
AD1582/AD1583/AD1584/AD1585 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 F capacitor attached to the input and a 1 F 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 F capacitor in parallel with the 4.7 F capacitor. While a 1 F output capacitor can provide stable performance for all loading conditions, the AD1582/AD1583/AD1584/AD1585 can operate under low (-100 A < IOUT < +100 A) current conditions with just a 0.2 F output capacitor. The 4.7 F 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/ AD1584/ AD1585
1
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
2.502
2.500
VOUT (V)
2.498
2.496
2.494 2.492 -40
-20
0
20 40 60 TEMPERATURE (C)
80
100
120
Figure 11. Output Voltage vs. Temperature
+ 1F VOUT
00701-010
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
VIN 4.7F
3
2
-
Figure 10. Typical Connection Diagram
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 25C. 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 -40C to +125C. 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 25C to the output values at +125C and -40C determines the performance grade of the device.
200
150
VOUT (ppm)
100
50
0
-25
0 25 50 TEMPERATURE (C)
75
100
Figure 12. Residual Drift Error
Rev. H | Page 11 of 16
00701-012
-50 -50
00701-011
AD1582/AD1583/AD1584/AD1585
OUTPUT VOLTAGE HYSTERESIS
High performance industrial equipment manufacturers can require the AD1582/AD1583/AD1584/AD1585 to maintain a consistent output voltage error at 25C 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 +25C output voltage after temperature excursions from +125C to +25C and from -40C to +25C. Figure 13 displays the distribution of the AD1582/AD1583/ AD1584/AD1585 output voltage hysteresis.
80 70 60
NUMBER OF PARTS
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 VOUT and up to 12 V. However, if negative voltage is inadvertently applied to VIN with respect to ground, or any negative transient >5 V is coupled to VIN, 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.
VLOAD DC 10k x1 10k 100A 10k 1F 2k DUT 5F
00701-015
50 40 30 20 10
00701-013
5V
2 x VOUT
0 -700
-450
-200
50 ppm
300
550
2V
Figure 13. Output Voltage Hysteresis Distribution
Figure 15. Output Impedance Test Circuit
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 A/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
100
1F CAP
OUTPUT IMPEDANCE ()
10 AD1585 AD1582 1
100
80 TA = +85C
1k 10k FREQUENCY (Hz)
100k
1M
Figure 16. Output Impedance vs. Frequency
60
IQ (A)
TA = +25C
10V 10k x1 5V 100mV 0.22F VOUT 0.22F
00701-017
40 TA = -40C 20
200mV
10k
DUT
Figure 17. Ripple Rejection Test Circuit
3 4 5 6 7 VIN (V) 8 9 10 11
00701-014
0
Figure 14. Typical Supply Current over Temperature
Rev. H | Page 12 of 16
00701-016
0.1 10
AD1582/AD1583/AD1584/AD1585
100 90 80 70
PSRR (dB)
100 90
100V
10ms
60 50
AD1582
AD1585 40 30 20 10
00701-018
10 0%
00701-020
0 1 10 100 1k 10k FREQUENCY (Hz) 100k 1M
Figure 20. 1 Hz to 10 Hz Voltage Noise
Figure 18. Ripple Rejection vs. Frequency
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 s. 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.
0V OR 10V 10k 5V OR 10V 0V OR 5V 0V TO 10V 10k 0.22F DUT VOUT 0.22F
00701-021
NOISE PERFORMANCE AND REDUCTION
The noise generated by the AD1582/AD1583/AD1584/AD1585 is typically less than 70 V 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 V 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.
10V
100 90
1s
10 0%
00701-019
Figure 21. Turn-On/Transient Response Test Circuit
Figure 19. 10 Hz to 10 kHz Wideband Noise
Rev. H | Page 13 of 16
AD1582/AD1583/AD1584/AD1585
5V
100 90
20s
100 90
5V
50s
10 0%
00701-022
10 0%
1V
20s
200mV
50s
Figure 22. Turn-On Characteristics
5V
100 90
Figure 24. Line Transient Response
5V
100 90
20s
20s
10 0%
00701-023
10 0%
1mV
20s
5mV
20s
Figure 23. Turn-On Settling
Figure 25. Load Transient Response (0 mA to 5 mA Load)
5V
100 90
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.
20s
10 0%
5mV
20s
Figure 26. Load Transient Response (0 mA to -1 mA Load)
Rev. H | Page 14 of 16
00701-026
00701-025
00701-024
AD1582/AD1583/AD1584/AD1585 OUTLINE DIMENSIONS
3.04 2.90 2.80 1.40 1.30 1.20
1
3
2.64 2.10
2
PIN 1 0.95 BSC 1.90 BSC 1.12 0.89 0.10 0.01 SEATING PLANE 0.50 0.30 0.60 0.50 0.40 0.20 0.08
COMPLIANT TO JEDEC STANDARDS TO-236-AB
Figure 27. 3-Lead Small Outline Transistor Package [SOT-23-3] (RT-3) Dimensions shown in millimeters
1.55 1.50 1.45
4.10 4.00 3.90
2.05 2.00 1.95
1.10 1.00 0.90
1.10 1.00 0.90
7" REEL 100.00 OR 13" REEL 330.00 0.35 0.30 0.25 20.20 MIN
14.40 MIN
8.30 8.00 7.70
3.55 3.50 3.45 3.20 3.10 2.90 1.00 MIN 0.75 MIN
2.80 2.70 2.60
1.50 MIN
13.20 13.00 12.80
7" REEL 50.00 MIN OR 13" REEL 100.00 MIN
DIRECTION OF UNREELING
Figure 28. SOT-23 Tape and Reel Outline Dimension (RT-3) Dimensions shown in millimeters
Rev. H | Page 15 of 16
053006-0
9.90 8.40 6.90
AD1582/AD1583/AD1584/AD1585
ORDERING GUIDE
Model AD1582ART-R2 AD1582ART-REEL7 AD1582ARTZ-R2 2 AD1582ARTZ-REEL72 AD1582BRT-R2 AD1582BRT-REEL7 AD1582BRTZ-REEL72 AD1583ART-R2 AD1583ART-REEL7 AD1583ARTZ-R22 AD1583ARTZ-REEL72 AD1583BRT-R2 AD1583BRT-REEL7 AD1583BRTZ-REEL72 AD1584ART-R2 AD1584ART-REEL7 AD1584ARTZ-R22 AD1584ARTZ-REEL72 AD1584BRT-R2 AD1584BRT-REEL7 AD1584BRTZ-REEL72 AD1585ART-R2 AD1585ART-REEL72 AD1585ARTZ-R22 AD1585ARTZ-REEL72 AD1585BRT-R2 AD1585BRT-REEL7 AD1585BRTZ-REEL72
1 2
Output Voltage (V) 2.50 2.50 2.50 2.50 2.50 2.50 2.50 3.00 3.00 3.00 3.00 3.00 3.00 3.00 4.096 4.096 4.096 4.096 4.096 4.096 4.096 5.00 5.00 5.00 5.00 5.00 5.00 5.00
Accuracy (mV) 20 20 20 20 2 2 2 30 30 30 30 3 3 3 40 40 40 40 4 4 4 50 50 50 50 5 5 5
Initial Accuracy (%) 0.80 0.80 0.80 0.80 0.08 0.08 0.08 1.00 1.00 1.00 1.00 0.10 0.10 0.10 0.98 0.98 0.98 0.98 0.10 0.10 0.10 1.00 1.00 1.00 1.00 0.10 0.10 0.10
Initial Temp. Coefficient (ppm/C) 100 100 100 100 50 50 50 100 100 100 100 50 50 50 100 100 100 100 50 50 50 100 100 100 100 50 50 50
Package Description SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3
Package Option RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3
Branding 1 2A 2A R1Z R1Z 2B 2B R20 3A 3A R22 R22 3B 3B R23 4A 4A R25 R25 4B 4B R26 5A 5A R28 R28 5B 5B R29
No. of Parts Banding per Reel 250 3,000 250 3,000 250 3,000 3,000 250 3,000 250 3,000 250 3,000 3,000 250 3,000 250 3,000 250 3,000 3,000 250 3,000 250 3,000 250 3,000 3,000
See Package Branding Information section. Z = RoHS Compliant Part.
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.
(c)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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