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1.2 V Micropower, Precision Shunt Voltage Reference AD1580
FEATURES
Wide operating range: 50 A to 10 mA Initial accuracy: 0.1% maximum Temperature drift: 50 ppm/C maximum Output impedance: 0.5 maximum Wideband noise (10 Hz to 10 kHz): 20 V rms Operating temperature range: -40C to +85C High ESD rating 4 kV human body model 400 V machine model Compact, surface-mount SOT-23 and SC70 packages
V+ 1
PIN CONFIGURATIONS
AD1580
3
V- 1 NC (OR V-) V+ 2
00700-001
AD1580
3
NC (OR V-)
V- 2 TOP VIEW NC = NO CONNECT
NC = NO CONNECT
Figure 1.
50 45 40
Figure 2.
APPLICATIONS
Portable, battery-powered equipment Cellular phones, notebook computers, PDAs, GPSs, and DMMs Computer workstations Suitable for use with a wide range of video RAMDACs Smart industrial transmitters PCMCIA cards Automotive 3 V/5 V, 8-bit to 12-bit data converters
QUANTITY
35 30 25 20 15 10 5 0 -40 -30 -20 -10 0 10 20 30 40
00700-003
TEMPERATURE DRIFT (ppm/C)
GENERAL DESCRIPTION
The AD1580 is a low cost, 2-terminal (shunt), precision band gap reference. It provides an accurate 1.225 V output for input currents between 50 A and 10 mA. The superior accuracy and stability of the AD1580 is made possible by the precise matching and thermal tracking of onchip components. Proprietary curvature correction design techniques have been used to minimize the nonlinearities in the voltage output temperature characteristics. The AD1580 is stable with any value of capacitive load. The low minimum operating current makes the AD1580 ideal for use in battery-powered 3 V or 5 V systems. However, the wide operating current range means that the AD1580 is extremely versatile and suitable for use in a wide variety of high current applications. The AD1580 is available in two grades, A and B, both of which are provided in the SOT-23 and SC70 packages, the smallest surface-mount packages available. Both grades are specified over the industrial temperature range of -40C to +85C.
1
Figure 3. Reverse Voltage Temperature Drift Distribution
300
1
250
200
QUANTITY
150
100
50
00700-004
0 -10
-8
-6
-4
-2
0
2
4
6
8
10
OUTPUT ERROR (mV)
Figure 4. Reverse Voltage Error Distribution
Protected by U.S. Patent No. 5,969,657; other patents pending.
Rev. C
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)2006 Analog Devices, Inc. All rights reserved.
00700-002
TOP VIEW
AD1580 TABLE OF CONTENTS
Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Pin Configurations ........................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 4 ESD Caution.................................................................................. 4 Typical Performance Characteristics ............................................. 5 Theory of Operation ........................................................................ 6 Applying the AD1580 .................................................................. 6 Temperature Performance........................................................... 6 Voltage Output Nonlinearity vs. Temperature ..........................7 Reverse Voltage Hysteresis...........................................................7 Output Impedance vs. Frequency ...............................................7 Noise Performance and Reduction .............................................8 Turn-On Time ...............................................................................8 Transient Response .......................................................................9 Precision Micropower Low Dropout Reference .......................9 Using the AD1580 with 3 V Data Converters ...........................9 Outline Dimensions ....................................................................... 11 Ordering Guide .......................................................................... 12 Package Branding Information ................................................ 12
REVISION HISTORY
7/06--Rev. B to Rev. C Updated Format..................................................................Universal Changes to Figure 13........................................................................ 7 Changes to Figure 16........................................................................ 8 Updated Outline Dimensions ....................................................... 11 Changes to Ordering Guide .......................................................... 12 7/04--Rev. A to Rev. B Changes to Ordering Guide ............................................................ 2 10/03--Rev. 0 to Rev. A Renumbered Figures and TPCs........................................Universal Edits to Features.................................................................................1 Edits to General Description ...........................................................1 Edits to Ordering Guide ...................................................................2 Updated Figures 5 Through 7..........................................................4 Updated Outline Dimensions..........................................................8
Rev. C | Page 2 of 12
AD1580 SPECIFICATIONS
TA = 25C, IIN = 100 A, unless otherwise noted. Table 1. AD1580A
Model REVERSE VOLTAGE OUTPUT (SOT-23) REVERSE VOLTAGE OUTPUT (SC70) REVERSE VOLTAGE TEMPERATURE DRIFT -40C to +85C MINIMUM OPERATING CURRENT, TMIN to TMAX REVERSE VOLTAGE CHANGE WITH REVERSE CURRENT 50 A < IIN < 10 mA, TMIN to TMAX 50 A < IIN < 1 mA, TMIN to TMAX DYNAMIC OUTPUT IMPEDANCE (VR/IR) IIN = 1 mA 100 A (f = 120 Hz) OUTPUT NOISE RMS Noise Voltage: 10 Hz to 10 kHz Low Frequency Noise Voltage: 0.1 Hz to 10 Hz TURN-ON SETTLING TIME TO 0.1% 1 OUTPUT VOLTAGE HYSTERESIS 2 TEMPERATURE RANGE Specified Performance, TMIN to TMAX Operating Range 3
1 2
AD1580B
Max 1.235 Min 1.224 1.2225 Typ 1.225 1.225 Max 1.226 1.2275 50 50 2.5 0.5 0.4 20 5 5 80 +85 +125 -40 -55 +85 +125 6 Unit V V ppm/C A mV mV
Min 1.215
Typ 1.225
100 50 2.5 0.5 0.4 20 5 5 80 -40 -55 6
1
0.5
V rms V p-p s V
C C
Measured with no load capacitor. Output hysteresis is defined as the change in the +25C output voltage after a temperature excursion to +85C and then to -40C. 3 The operating temperature range is defined as the temperature extremes at which the device continues to function. Parts may deviate from their specified performance.
Rev. C | Page 3 of 12
AD1580 ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Reverse Current Forward Current Internal Power Dissipation1 SOT-23 (RT) Storage Temperature Range Operating Temperature Range AD1580/RT Lead Temperature, Soldering Vapor Phase (60 sec) Infrared (15 sec) ESD Susceptibility2 Human Body Model Machine Model
1 2
Rating 25 mA 20 mA 0.3 W -65C to +150C -55C to +125C 215C 220C 4 kV 400 V
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.
Specification is for device in free air at 25C: SOT-23 package: JA = 300C/W. The human body model is a 100 pF capacitor discharged through 1.5 k. For the machine model, a 200 pF capacitor is discharged directly into the device.
ESD 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 this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
Rev. C | Page 4 of 12
AD1580 TYPICAL PERFORMANCE CHARACTERISTICS
1000 100
REVERSE VOLTAGE CHANGE (ppm)
500
80
0
REVERSE CURRENT (A)
60
-500 ~20ppm/C -1000
40
+85C
-1500
00700-005
20
+25C
00700-008
-40C 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
-2000 -55
-35
-15
5
25
45
65
85
105
125
TEMPERATURE (C)
REVERSE VOLTAGE (V)
Figure 5. Output Drift for Different Temperature Characteristics
4
Figure 8. Reverse Current vs. Reverse Voltage
1.0 -40C +25C
REVERSE VOLTAGE CHANGE (mV)
3
0.8
2
TA = +125C
FORWARD VOLTAGE (V)
0.6
+85C
1
0.4
0
TA = -40C TO +85C
00700-006
0.2
00700-009
-1 0.01
0.1 1 REVERSE CURRENT (mA)
10
0 0.01
0.1
1 FORWARD CURRENT (mA)
10
100
Figure 6. Output Voltage Error vs. Reverse Current
Figure 9. Forward Voltage vs. Forward Current
600 NOISE VOLTAGE (nV/ Hz)
400
200
1.0
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
Figure 7. Noise Spectral Density
00700-007
Rev. C | Page 5 of 12
AD1580 THEORY OF OPERATION
The AD1580 uses the band gap concept to produce a stable, low temperature coefficient voltage reference suitable for high accuracy data acquisition components and systems. The device makes use of the underlying physical nature of a silicon transistor base emitter voltage in the forward biased operating region. All such transistors have an approximately -2 mV/C temperature coefficient, which is unsuitable for use directly as a low TC reference; however, extrapolation of the temperature characteristic of any one of these devices to absolute zero (with collector current proportional to absolute temperature) reveals that its VBE goes to approximately the silicon band gap voltage. Thus, if a voltage could be developed with an opposing temperature coefficient to sum with VBE, a zero TC reference would result. The AD1580 circuit in Figure 10 provides such a compensating voltage, V1, 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 provides a stable voltage reference.
V+
Figure 12 shows a typical connection of the AD1580BRT operating at a minimum of 100 A. This connection can provide 1 mA to the load while accommodating 10% power supply variations.
VS RS VR IR VOUT
00700-011
IR + IL IL
Figure 11. Typical Connection Diagram
+5V(+3V) 10% RS VR VOUT
00700-012
2.94k (1.30k)
V1
Figure 12. Typical Connection Diagram
TEMPERATURE PERFORMANCE
The AD1580 is designed for reference applications where stable temperature performance is important. Extensive temperature testing and characterization ensure that the device's performance is maintained over the specified temperature range.
00700-010
VBE
VBE V-
Figure 10. Schematic Diagram
APPLYING THE AD1580
The AD1580 is simple to use in virtually all applications. To operate the AD1580 as a conventional shunt regulator (see Figure 11), an external series resistor is connected between the supply voltage and the AD1580. For a given supply voltage, the series resistor, RS, determines the reverse current flowing through the AD1580. The value of RS must be chosen to accommodate the expected variations of the supply voltage, VS; load current, IL; and the AD1580 reverse voltage, VR; while maintaining an acceptable reverse current, IR, through the AD1580. The minimum value for RS should be chosen when VS is at its minimum and IL and VR are at their maximum, while maintaining the minimum acceptable reverse current. The value of RS should be large enough to limit IR to 10 mA when VS is at its maximum and IL and VR are at their minimum. The equation for selecting RS is as follows: RS = (VS - VR)/(IR + IL)
Some confusion exists in the area of defining and specifying reference voltage error over temperature. Historically, references have been characterized using a maximum deviation per degree Celsius, for example, 50 ppm/C. However, because of nonlinearities in temperature characteristics that originated in standard Zener references (such as S type characteristics), most manufacturers now use a maximum limit error band approach to specify devices. This technique involves the measurement of the output at three or more different temperatures to guarantee that the voltage falls within the given error band. The proprietary curvature correction design techniques used to minimize the AD1580 nonlinearities allow the temperature performance to be guaranteed using the maximum deviation method. This method is of more use to a designer than the one that simply guarantees the maximum error band over the entire temperature change. Figure 13 shows a typical output voltage drift for the AD1580 and illustrates the methodology. The maximum slope of the two diagonals drawn from the initial output value at +25C to the output values at +85C and -40C determines the performance grade of the device. For a given grade of the AD1580, the
Rev. C | Page 6 of 12
AD1580
designer can easily determine the maximum total error from the initial tolerance plus temperature variation.
1.2258 1.2256 SLOPE = TC = 1.2254 (VMAX - VO) (+85C - +25C) x 1.225 x 10 -6 VMAX
REVERSE VOLTAGE HYSTERESIS
A major requirement for high performance industrial equipment manufacturers is a consistent output voltage at nominal temperature following operation over the operating temperature range. This characteristic is generated by measuring the difference between the output voltage at +25C after operation at +85C and the output, at +25C after operation at -40C. Figure 15 displays the hysteresis associated with the AD1580. This characteristic exists in all references and has been minimized in the AD1580.
40
OUTPUT VOLTAGE (V)
1.2252 1.2250 1.2248 1.2246 1.2244 1.2242 1.2240 1.2238 -55 VMIN -35 -15 5 25 45 65 85 105 125 TEMPERATURE (C) SLOPE = TC = (VMIN - VO)
00700-013
VO
(-40C - +25C) x 1.225 x
10 -6
35 30 25 20 15 10
00700-015
Figure 13. Output Voltage vs. Temperature
For example, the AD1580BRT initial tolerance is 1 mV; a 50 ppm/C temperature coefficient corresponds to an error band of 4 mV (50 x 10-6 x 1.225 V x 65C). Thus, the unit is guaranteed to be 1.225 V 5 mV over the operating temperature range. Duplication of these results requires a combination of high accuracy and stable temperature control in a test system. Evaluation of the AD1580 produces a curve similar to that in Figure 5 and Figure 13.
QUANTITY
5 0 -400
-300
-200
-100
0
100
200
300
400
HYSTERESIS VOLTAGE (V)
Figure 15. Reverse Voltage Hysteresis Distribution
OUTPUT IMPEDANCE VS. FREQUENCY
Understanding the effect of the reverse dynamic output impedance in a practical application may be important to successfully apply the AD1580. A voltage divider is formed by the AD1580 output impedance and the external source impedance. When an external source resistor of about 30 k (IR = 100 A) is used, 1% of the noise from a 100 kHz switching power supply is developed at the output of the AD1580. Figure 16 shows how a 1 F load capacitor connected directly across the AD1580 reduces the effect of power supply noise to less than 0.01%.
1k
VOLTAGE OUTPUT NONLINEARITY VS. TEMPERATURE
When a reference is used with data converters, it is important to understand how temperature drift affects the overall converter performance. The nonlinearity of the reference output drift represents additional error that is not easily calibrated out of the system. This characteristic (see Figure 14) is generated by normalizing the measured drift characteristic to the end point average drift. The residual drift error of approximately 500 ppm shows that the AD1580 is compatible with systems that require 10-bit accurate temperature performance.
600
OUTPUT IMPEDANCE ()
100
RESIDUAL DRIFT ERROR (ppm)
500
CL = 0
400
10 IR = 0.1IR IR = 100A 1 IR = 1mA
00700-016
300
CL = 1F
200
100
00700-014
0.1 10
100
1k
10k
100k
1M
0 -55
FREQUENCY (Hz)
-35
-15
5
25
45
65
85
105
125
TEMPERATURE (C)
Figure 16. Output Impedance vs. Frequency
Figure 14. Residual Drift Error
Rev. C | Page 7 of 12
AD1580
NOISE PERFORMANCE AND REDUCTION
The noise generated by the AD1580 is typically less than 5 V p-p over the 0.1 Hz to 10 Hz band. Figure 17 shows the 0.1 Hz to 10 Hz noise of a typical AD1580. Noise in a 10 Hz to 10 kHz bandwidth is approximately 20 V rms (see Figure 18a). If further noise reduction is desired, a 1-pole low-pass filter can be added between the output pin and ground. A time constant of 0.2 ms has a -3 dB point at about 800 Hz and reduces the high frequency noise to about 6.5 V rms (see Figure 18b). A time constant of 960 ms has a -3 dB point at 165 Hz and reduces the high frequency noise to about 2.9 V rms (see Figure 18c). Upon application of power (cold start), the time required for the output voltage to reach its final value within a specified error is the turn-on settling time. Two components normally associated with this are time for active circuits to settle and time for thermal gradients on the chip to stabilize. This characteristic is generated from cold start operation and represents the true turn-on waveform after power-up. Figure 21 shows both the coarse and fine turn-on settling characteristics of the device; the total settling time to within 1.0 mV is about 6 s, and there is no long thermal tail when the horizontal scale is expanded to 2 ms/div.
2.4V 0V 4.5V p-p CL = 200pF VIN
250mV/DIV 1V/DIV 1s/DIV
00700-017
5s/DIV
Figure 19. Turn-On Response Time
Figure 17. 0.1 Hz to 10 Hz Voltage Noise
40V/DIV 21V rms
RS = 11.5k RL
+ -
20V/DIV 6.5V rms, = 0.2ms
00700-020
00700-021
(a)
VIN
VR
CL
VOUT
Figure 20. Turn-On, Settling, and Transient Test Circuit
(b)
10V/DIV
2.90V rms, = 960ms
Output turn-on time is modified when an external noise reduction filter is used. When present, the time constant of the filter dominates overall settling.
00700-018
(c)
10ms/DIV
2.4V VIN 0V OUTPUT ERROR 1mV/DIV, 2s/DIV
Figure 18. Total RMS Noise
TURN-ON TIME
Many low power instrument manufacturers are becoming increasingly concerned with the turn-on characteristics of components being used in their systems. Fast turn-on components often enable the end user to keep power off when not needed, and yet those components respond quickly when the power is turned on for operation. Figure 19 displays the turn-on characteristic of the AD1580.
OUTPUT 0.5mV/DIV, 2ms/DIV
Figure 21. Turn-On Settling
Rev. C | Page 8 of 12
00700-019
AD1580
TRANSIENT RESPONSE
Many A/D and D/A converters present transient current loads to the reference. Poor reference response can degrade the converter's performance. Figure 22 displays both the coarse and fine settling characteristics of the device to load transients of 50 A.
20mV/DIV 1mV/DIV
PRECISION MICROPOWER LOW DROPOUT REFERENCE
The circuit in Figure 24 provides an ideal solution for making a stable voltage reference with low standby power consumption, low input/output dropout capability, and minimum noise output. The amplifier both buffers and optionally scales up the AD1580 output voltage, VR. Output voltages as high as 2.1 V can supply 1 mA of load current. A one-pole filter connected between the AD1580 and the OP193 input can be used to achieve low output noise. The nominal quiescent power consumption is 200 W.
3V 34.8k 205 4.7F
IR = 100A + 50A STEP
(a)
OP193
(b)
IR = 100A - 50A STEP
VOUT = +1.225V OR VOUT = +1.225 (1 + R2/R3)
00700-022
20mV/DIV
1mV/DIV
1s/DIV
AD1580
R3
R2
00700-024
Figure 22. Transient Settling
Figure 22a shows the settling characteristics of the device for an increased reverse current of 50 A. Figure 22b shows the response when the reverse current is decreased by 50 A. The transients settle to 1 mV in about 3 s. Attempts to drive a large capacitive load (in excess of 1000 pF) may result in ringing, as shown in the step response (see Figure 23). This is due to the additional poles formed by the load capacitance and the output impedance of the reference. A recommended method of driving capacitive loads of this magnitude is shown in Figure 20. A resistor isolates the capacitive load from the output stage, while the capacitor provides a single-pole low-pass filter and lowers the output noise.
2.0V 1.8V VIN
Figure 24. Micropower Buffered Reference
USING THE AD1580 WITH 3 V DATA CONVERTERS
The AD1580 low output drift (50 ppm/C) and compact subminiature SOT-23 package make it ideally suited for today's high performance converters in space critical applications. One family of ADCs for which the AD1580 is well suited is the AD7714-3 and AD7715-3. The AD7714/AD7715 are chargebalancing (-) A/D converters with on-chip digital filtering intended for the measurement of wide dynamic range, low frequency signals such as those representing chemical, physical, or biological processes. Figure 25 shows the AD1580 connected to the AD7714/AD7715 for 3 V operation.
3V 34.8k REFIN(+) RSW 5k (TYP)
AD7714/AD7715-3
HIGH IMPEDANCE >1G
AD1580
REFIN(-)
CREF (3pF TO 8pF) SWITCHING FREQUENCY DEPENDS ON fCLKIN
CL = 0.01F
Figure 25. Reference Circuit for the AD7714/AD7715-3
10mV/DIV 50s/DIV
00700-023
Figure 23. Transient Response with Capacitive Load
Rev. C | Page 9 of 12
00700-025
AD1580
The AD1580 is ideal for creating the reference level to use with 12-bit multiplying DACs, such as the AD7943, AD7945, and AD7948. In the single-supply bias mode (see Figure 26), the impedance seen looking into the IOUT2 terminal changes with DAC code. If the AD1580 drives IOUT2 and AGND directly, less than 0.2 LSBs of additional linearity error results. The buffer amp eliminates any linearity degradation that could result from variations in the reference level.
3.3V
VDD VREF
RBF IOUT1
C1 IOUT2 AGND A1 A1: OP295 AD822 OP2283 VOUT
VIN
DAC
AD7943/ AD7945/ AD7948
DGND
3.3V 41.2k
A1
00700-026
AD1580
SIGNAL GROUND
Figure 26. Single-Supply System
Rev. C | Page 10 of 12
AD1580 OUTLINE DIMENSIONS
3.04 2.90 2.80 1.40 1.30 1.20
1
3
2.64 2.10
2
1.35 1.25 1.15
1
2.20 2.00 1.80 2.40 2.10 1.80
3 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
0.10 MAX PIN 1 1.00 0.80
0.65 BSC 1.10 0.80
0.40 0.10 0.30 0.20 0.10
111505-0
0.40 0.25
0.10 COPLANARITY
SEATING PLANE
0.26 0.10
COMPLIANT TO JEDEC STANDARDS TO-236-AB
ALL DIMENSIONS COMPLIANT WITH EIAJ SC70
Figure 27. 3-Lead Small Outline Transistor Package [SOT-23-3] (RT-3) Dimensions shown in millimeters
Figure 28. 3-Lead Thin Shrink Small Outline Transistor Package [SC70] (KS-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 29. Tape and Reel Dimensions (RT-3 and KS-3) Dimensions shown in millimeters
Rev. C | Page 11 of 12
053006-0
9.90 8.40 6.90
AD1580
ORDERING GUIDE
Model AD1580ART-R2 AD1580ART-REEL AD1580ART-REEL7 AD1580ARTZ-REEL 1 AD1580ARTZ-REEL71 AD1580BRT-R2 AD1580BRT-REEL AD1580BRT-REEL7 AD1580BRTZ-REEL71 AD1580BKSZ-REEL1 AD1580BKSZ-REEL71
1
Temperature Range -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C
Initial Output Error 10 mV 10 mV 10 mV 10 mV 10 mV 1 mV 1 mV 1 mV 1 mV 2.5 mV 2.5 mV
Temperature Coefficient 100 ppm/C 100 ppm/C 100 ppm/C 100 ppm/C 100 ppm/C 50 ppm/C 50 ppm/C 50 ppm/C 50 ppm/C 50 ppm/C 50 ppm/C
Package Description 3-Lead SOT-23-3 3-Lead SOT-23-3 3-Lead SOT-23-3 3-Lead SOT-23-3 3-Lead SOT-23-3 3-Lead SOT-23-3 3-Lead SOT-23-3 3-Lead SOT-23-3 3-Lead SOT-23-3 3-Lead SC70 3-Lead SC70
Package Option RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 RT-3 KS-3 KS-3
Branding 0Axx 0Axx 0Axx R0Y R0Y 0Bxx 0Bxx 0Bxx R2E R2E R2E
Z = Pb-free part.
PACKAGE BRANDING INFORMATION
In the SOT-23 package (RT), four marking fields identify the device generic, grade, and date of processing. The first field is the product identifier. A 0 identifies the generic as the AD1580. The second field indicates the device grade: A or B. In the third field, a numeral or letter indicates a calendar year: 5 for 1995, A for 2001. In the fourth field, letters A through Z represent a two-week window within the calendar year, starting with A for the first two weeks of January.
(c)2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C00700-0-7/06(C)
Rev. C | Page 12 of 12

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