1.2 V Micropower, Precision
Shunt Voltage Reference
AD1580
Rev. F
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FEATURES
Wide operating range: 50 µA to 10 mA
Initial accuracy: ±0.1% maximum
Temperature drift: ±50 ppm/°C maximum
Output impedance: 0.5 Ω maximum
Wideband noise (10 Hz to 10 kHz): 20 µV rms
Operating temperature range: −40°C to +85°C
High ESD rating
4 kV human body model
400 V machine model
Compact, surface-mount SOT-23 and SC70 packages
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
GENERAL DESCRIPTION
The AD15801
The superior accuracy and stability of the AD1580 is made
possible by the precise matching and thermal tracking of
on-chip components. Proprietary curvature correction
design techniques have been used to minimize the nonli-
nearities in the voltage output temperature characteristics.
The AD1580 is stable with any value of capacitive load.
is a low cost, 2-terminal (shunt), precision band
gap reference. It provides an accurate 1.225 V output for input
currents between 50 μA and 10 mA.
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 −40°C to +85°C.
1 Protected by U.S. Patent No. 5,969,657.
PIN CONFIGURATIONS
NC = NO CONNECT
TOP VIEW
V+
1
V–
2
NC (OR V–)
3
AD1580
00700-001
NC = NO CONNECT
TOP VIEW
V–
1
V+
2
NC (OR V–)
3
AD1580
00700-002
Figure 1. SOT-23 Figure 2. SC70
50
0
QUANTITY
45
40
35
30
25
20
15
10
5
TEMPERATUREDRIFT (ppm/°C)
–40–30–20–10 0 10 20 30 40
00700-003
Figure 3. Reverse Voltage Temperature Drift Distribution
OUTPUT ERROR (mV)
300
0
QUANTITY
250
200
150
100
50
–10 –8 –6 –4 –2 0 2 4 6 8 10
00700-004
Figure 4. Reverse Voltage Error Distribution
AD1580
Rev. F | Page 2 of 12
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
7/11—Re v. E to Re v. F
Changes to Ordering Guide .......................................................... 12
7/11—Re v. D to Re v. E
Updated Outline Dimensions ....................................................... 11
Changes to Ordering Guide .......................................................... 12
1/08—Re v. C to Re v. D
Changes to Figure 5 .......................................................................... 5
Changes to Figure 6 Caption ........................................................... 5
Changes to Ordering Guide .......................................................... 12
7/06—Re v. B to Re v. 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
AD1580
Rev. F | Page 3 of 12
SPECIFICATIONS
TA = 25°C, IIN = 100 µA, unless otherwise noted.
Table 1.
Model
AD1580A AD1580B
Unit Min Typ Max Min Typ Max
REVERSE VOLTAGE OUTPUT (SOT-23) 1.215 1.225 1.235 1.224 1.225 1.226 V
REVERSE VOLTAGE OUTPUT (SC70) 1.2225 1.225 1.2275 V
REVERSE VOLTAGE TEMPERATURE DRIFT
−40°C to +85°C 100 50 ppm/°C
MINIMUM OPERATING CURRENT, TMIN to TMAX 50 50 μA
REVERSE VOLTAGE CHANGE WITH REVERSE CURRENT
50 μA < IIN < 10 mA, TMIN to TMAX 2.5 6 2.5 6 mV
50 μA < IIN < 1 mA, TMIN to TMAX 0.5 0.5 mV
DYNAMIC OUTPUT IMPEDANCE (∆VR/ΔIR)
IIN = 1 mA ± 100 μA (f = 120 Hz) 0.4 1 0.4 0.5 Ω
OUTPUT NOISE
RMS Noise Voltage: 10 Hz to 10 kHz 20 20 μV rms
Low Frequency Noise Voltage: 0.1 Hz to 10 Hz 5 5 μV p-p
TURN-ON SETTLING TIME TO 0.1%1 5 5 µs
OUTPUT VOLTAGE HYSTERESIS2 80 80 µV
TEMPERATURE RANGE
Specified Performance, TMIN to TMAX −40 +85 −40 +85 °C
Operating Range3−55 +125 −55 +125 °C
1 Measured with no load capacitor.
2 Output hysteresis is defined as the change in the +25°C output voltage after a temperature excursion to +85°C and then to −40°C.
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.
AD1580
Rev. F | Page 4 of 12
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Rating
Reverse Current 25 mA
Forward Current 20 mA
Internal Power Dissipation1
SOT-23 (RT) 0.3 W
Storage Temperature Range −65°C to +150°C
Operating Temperature Range
AD1580/RT −55°C to +125°C
Lead Temperature, Soldering
Vapor Phase (60 sec) 215°C
Infrared (15 sec) 220°C
ESD Susceptibility2
Human Body Model 4 kV
Machine Model 400 V
1 Specification is for device in free air at 25°C, SOT-23 package. θJA = 300°C/W.
2 The human body model is a 100 pF capacitor discharged through 1.5 kΩ. For
the machine model, a 200 pF capacitor is discharged directly into the device.
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
AD1580
Rev. F | Page 5 of 12
TYPICAL PERFORMANCE CHARACTERISTICS
REVERSE VOLTAGE CHANGE (pp m)
–2000
–1000
–500
0
500
1000
–1500
TEMPERATURE (°C)
–55 –35 –15 525 45 65 85 105 125
00700-005
Figure 5. Output Drift for Different Temperature Characteristics
Figure 6. Reverse Voltage Change vs. Reverse Current
FREQUENCY (Hz)
600
200
400
NOISE VOLTAGE (nV/ Hz)
1.0 10 100 1k 10k100k 1M
00700-007
Figure 7. Noise Spectral Density
REVERSE VOLTAGE (V)
100
0
40
20
80
60
–40°C
+85°C
+25°C
REVE RS E CURRE NT (µA)
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
00700-008
Figure 8. Reverse Current vs. Reverse Voltage
FORWARD CURRENT (mA)
1.0
0
FORWARD VOLTAGE (V)
0.4
0.2
0.8
0.6
+25°C
+85°C
–40°C
0.01 0.1 1 10 100
00700-009
Figure 9. Forward Voltage vs. Forward Current
AD1580
Rev. F | Page 6 of 12
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 tran-
sistor base emitter voltage in the forward biased operating
region. All such transistors have an approximately −2 mV/°C
temperature coefficient (TC), 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+
V–
V1
ΔV
BE
V
BE
00700-010
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)
Figure 12 shows a typical connection of the AD1580BRT
operating at a minimum of 100 µA. This connection can
provide ±1 mA to the load while accommodating ±10%
power supply variations.
VS
IR+ IL
RS
VOUT
IL
VR
IR
00700-011
Figure 11. Typical Connection Diagram
+5V(+3V) ±10%
2.94kΩ
(1.30kΩ)
RS
VR
VOUT
00700-012
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.
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 nonlinear-
ities in temperature characteristics that originated in standard
Zener references (such as S type characteristics), most manufac-
turers 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 temper-
ature 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 +25°C to the
output values at +85°C and −40°C determines the performance
grade of the device. For a given grade of the AD1580, the designer
can easily determine the maximum total error from the initial
tolerance plus temperature variation.
AD1580
Rev. F | Page 7 of 12
OUTPUT VOLTAGE (V)
1.2238
1.2248
1.2250
1.2252
1.2254
1.2256
1.2258
1.2244
1.2246
1.2240
1.2242
VMAX
VMIN
SLOPE = TC = (VMAX – VO)
(+85°C – +25°C) × 1.225 × 10–6
SLOPE = TC = (VMIN – VO)
(–40°C – +25°C) × 1.225 × 10–6
VO
–55–35–15 5 25 45 65 85 105125
TEMPERATURE (°C)
00700-013
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 × 10−6 × 1.225 V × 65°C). 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.
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 an 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.
Figure 14. Residual Drift Error
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 measur-
ing the difference between the output voltage at +25°C after
operation at +85°C and the output, at +25°C after operation
at −40°C. Figure 15 displays the hysteresis associated with the
AD1580. This characteristic exists in all references and has been
minimized in the AD1580.
QUANTITY
0
15
20
25
30
35
40
5
10
HYSTERESIS VOLTAGE (µV)
–400–300–200–100 0 100200300400
00700-015
Figure 15. Reverse Voltage Hysteresis Distribution
OUTPUT IMPEDANCE vs. FREQUENCY
Understanding the effect of the reverse dynamic output imped-
ance 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 kΩ (IR = 100 μA) is used,
1% of the noise from a 100 kHz switching power supply is devel-
oped at the output of the AD1580. Figure 16 shows how a 1 µF
load capacitor connected directly across the AD1580 reduces
the effect of power supply noise to less than 0.01%.
1k
10
0.1
1
100
FREQUENCY (Hz)
CL= 0
CL= 1µF
ΔIR= 0.1IR
IR=100µA
IR=1mA
OUTPUT IMPE DANCE ( Ω)
10 100 1k 10k100k 1M
00700-016
Figure 16. Output Impedance vs. Frequency
AD1580
Rev. F | Page 8 of 12
NOISE PERFORMANCE AND REDUCTION
The noise generated by the AD1580 is typically less than
5 µV 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 μV 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 μV 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 μV rms (see
Figure 18c).
1s/DIV1µV/DIV
4.5µV p-p
00700-017
Figure 17. 0.1 Hz to 10 Hz Voltage Noise
40µV/DIV 21µV rms
20µV/DIV
10µV/DIV
10ms/DIV
6.5µV rms,τ= 0.2ms
(a)
(b)
(c)
2.90µV rms,τ=960ms
00700-018
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 compo-
nents 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.
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 µs, and there
is no long thermal tail when the horizontal scale is expanded to
2 ms/div.
250mV/DIV 5µs/DIV
CL=200pF
VIN
0V
2.4V
00700-019
Figure 19. Turn-On Response Time
+
–
RS=11.5kΩRL
CLVOUT
VR
VIN
00700-020
Figure 20. Turn-On, Settling, and Transient Test Circuit
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.
0V
VIN
2.4V
OUTPUT ERROR
1mV/DIV, 2µs/DIV
OUTPUT
0.5mV/DIV, 2ms/DIV
00700-021
Figure 21. Turn-On Settling
AD1580
Rev. F | Page 9 of 12
TRANSIENT RESPONSE
Many ADC and DAC 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 μA.
(a)
(b)
1µs/DIV
1mV/DIV
20mV/DIV
I
R
=100µA – 50µA STEP
I
R
=100µA + 50µA STEP
1mV/DIV
20mV/DIV
00700-022
Figure 22. Transient Settling
Figure 22a shows the settling characteristics of the device for
an increased reverse current of 50 μA. Figure 22b shows the
response when the reverse current is decreased by 50 µA.
The transients settle to 1 mV in about 3 µs.
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 capacit-
ance 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.
1.8V
2.0V
V
IN
C
L
= 0.01µF
50µs/DIV
10mV/DIV
00700-023
Figure 23. Transient Response with Capacitive Load
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 µW.
3V
34.8kΩ
AD1580
OP193VOUT = +1.225V
OR
VOUT = +1.225 (1 + R2/R3)
R3 R2
4.7µF
205Ω
00700-024
Figure 24. Micropower Buffered Reference
USING THE AD1580 WITH 3 V DATA CONVERTERS
The AD1580 low output drift (50 ppm/°C) and compact submi-
niature 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 charge-
balancing ( ∑-∆) ADCs 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
AD7714-3/AD7715-3 for 3 V operation.
AD7714-3 AND AD7715–3
AD1580
3V
34.8kΩ
REFIN(+)
REFIN(–)
HIGH
IMPEDANCE
>1GΩ
RSW
5kΩ (TYP)
CREF
(3pF TO 8pF)
SWITCHING
FRE QUENCY DE P E NDS
ON
f
CLKIN
00700-025
Figure 25. Reference Circuit for the AD7714-3 and AD7715-3
AD1580
Rev. F | Page 10 of 12
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.
DAC
RBF
AGND
DGND
A1
C1
3.3V
41.2kΩ
3.3V
AD1580
SIGNAL GROUND
A1: OP295
AD822
OP2283
A1
V
REF
V
IN
V
DD
I
OUT1
I
OUT2
V
OUT
AD7943/
AD7945/
AD7948
00700-026
Figure 26. Single-Supply System
AD1580
Rev. F | Page 11 of 12
OUTLINE DIMENSIONS
3.04
2.90
2.80
COMPLIANT TO JEDE C S TANDARDS TO-236-AB
011909-C
12
3
SEATING
PLANE
2.64
2.10
1.40
1.30
1.20
2.05
1.78
0.100
0.013
1.03
0.89
0.60
0.45
0.51
0.37
1.12
0.89 0.180
0.085
0.25
0.54
REF
GAUGE
PLANE
0.60 M AX
0.30 M IN
1.02
0.95
0.88
ALL DIMENSIONS COMPLIANT WITH EIAJ SC70
072809-A
0.40
0.25
0.10 MAX
1.00
0.80 1.10
0.80
0.40
0.10
0.26
0.10
0.30
0.20
0.10
2
1
3
0.65 BSC
2.20
2.00
1.80
2.40
2.10
1.80
1.35
1.25
1.15
COPLANARITY
0.10
SEATING
PLANE
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
053006-0
20.20
MIN
1.00 M IN 0.75 M IN
1.10
1.00
0.90
1.50 M IN
7” REE L 100.00
OR
13” REE L 330.00
7” REE L 50.00 M IN
OR
13” REE L 100.00 M IN
DIRE CTION OF UNREELING
0.35
0.30
0.25
2.80
2.70
2.60
1.55
1.50
1.45
4.10
4.00
3.90 1.10
1.00
0.90
2.05
2.00
1.95
8.30
8.00
7.70
3.20
3.10
2.90
3.55
3.50
3.45
13.20
13.00
12.80
14.40 M IN
9.90
8.40
6.90
Figure 29. Tape and Reel Dimensions
(RT-3 and KS-3)
Dimensions shown in millimeters
AD1580
Rev. F | Page 12 of 12
ORDERING GUIDE
Model1
Temperature
Range
Initial Output
Error
Temperature
Coefficient
Package
Description
Package
Option Branding
AD1580ART-REEL −40°C to +85°C 10 mV 100 ppm/°C 3-Lead SOT-23-3 RT-3 0Axx
AD1580ARTZ-REEL −40°C to +85°C 10 mV 100 ppm/°C 3-Lead SOT-23-3 RT-3 R0Y
AD1580ARTZ-REEL7 −40°C to +85°C 10 mV 100 ppm/°C 3-Lead SOT-23-3 RT-3 R0Y
AD1580BRT-REEL7 −40°C to +85°C 1 mV 50 ppm/°C 3-Lead SOT-23-3 RT-3 0Bxx
AD1580BRTZ-R2 −40°C to +85°C 1 mV 50 ppm/°C 3-Lead SOT-23-3 RT-3 R2E
AD1580BRTZ-REEL7 −40°C to +85°C 1 mV 50 ppm/°C 3-Lead SOT-23-3 RT-3 R2E
AD1580BKSZ-REEL −40°C to +85°C 2.5 mV 50 ppm/°C 3-Lead SC70 KS-3 R2E
AD1580BKSZ-REEL7 −40°C to +85°C 2.5 mV 50 ppm/°C 3-Lead SC70 KS-3 R2E
1 Z = RoHS Compliant 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.
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D00700-0-7/11(F)