AD580JH ,High Precision 2.5 V IC ReferenceSPECIFICATIONS Table 1. VIN = 15 V and 25°C AD580J AD580K AD580L AD580M Model Min Typ Max Min T ..
AD580KH ,High Precision 2.5 V IC ReferenceGENERAL DESCRIPTION PRODUCT HIGHLIGHTS 1. Laser-trimming of the thin film resistors minimizes the 1 ..
AD580KH ,High Precision 2.5 V IC Referencespecifications. –55°C to +125°C. ..
AD580LH ,High Precision 2.5 V IC ReferenceSpecifications.... 3 The AD580 as a Current Limiter....6 Absolute Maximum Ratings...... 4 The AD580 ..
AD580MH ,High Precision 2.5 V IC Referenceapplications. 6. The AD580 is available in versions compliant with MIL-The AD580J, K, L, and M are ..
AD580UH/883B , High Precision, 2.5 V IC Reference
AD977ABR ,16-Bit, 100 kSPS/200 kSPS BiCMOS A/D Converterspecifications in dB are referred to a full scale – 10 V input.8Full-Power Bandwidth is defined as ..
AD977ABRS ,16-Bit, 100 kSPS/200 kSPS BiCMOS A/D Converterspecifications in dB are referred to a full scale – 10 V input.8Full-Power Bandwidth is defined as ..
AD977ACN ,16-Bit, 100 kSPS/200 kSPS BiCMOS A/D Converterspecifications in dB are referred to a full scale – 10 V input.8Full-Power Bandwidth is defined as ..
AD977AN ,16-Bit, 100 kSPS/200 kSPS BiCMOS A/D ConverterSpecificationsspecified for full scale bipolar input ranges of – 10 V, – 5 V andIn addition to the ..
AD977AR ,16-Bit, 100 kSPS/200 kSPS BiCMOS A/D ConverterSpecifications subject to change without notice.–2– REV. CAD977/AD977AAD977A–
AD977ARS ,16-Bit, 100 kSPS/200 kSPS BiCMOS A/D ConverterSPECIFICATIONS (–408C to +858C, F = 100 kHz, V = V = +5 V, unless otherwise noted)S DIG ANA ..
AD580JH-AD580KH-AD580LH-AD580MH
High Precision 2.5 V IC Reference
High Precision,
2.5 V IC Reference
Rev. B
FEATURES
Laser-trimmed to high accuracy: 2.500 V ±0.4%
3-terminal device: voltage in/voltage out
Excellent temperature stability: 10 ppm/°C (AD580M, U)
Excellent long-term stability: 250 µV (25 µV/month)
Low quiescent current: 1.5 mA maximum
Small, hermetic IC package: TO-52 can
MIL-STD-883 compliant versions available
FUNCTIONAL BLOCK DIAGRAM 00525-B
-001Figure 1.
GENERAL DESCRIPTION The AD5801 is a 3-terminal, low cost, temperature-
compensated, bandgap voltage reference, which provides a fixed
2.5 V output for inputs between 4.5 V and 30 V. A unique
combination of advanced circuit design and laser-wafer
trimmed thin film resistors provide the AD580 with an initial
tolerance of ±0.4%, a temperature stability of better than 10
ppm/°C, and long-term stability of better than 250 µV. In
addition, the low quiescent current drain of 1.5 mA maximum
offers a clear advantage over classical Zener techniques.
The AD580 is recommended as a stable reference for all 8-, 10-,
and 12-bit D/A converters that require an external reference. In
addition, the wide input range of the AD580 allows operation
with 5 volt logic supplies, making the AD580 ideal for digital
panel meter applications or whenever only a single logic power
supply is available.
The AD580J, K, L, and M are specified for operation over the
0°C to +70°C temperature range; the AD580S, T, and U are
specified for operation over the extended temperature range of
–55°C to +125°C.
PRODUCT HIGHLIGHTS 1. Laser-trimming of the thin film resistors minimizes the
AD580 output error. For example, the AD580L output
tolerance is ±10 mV.
2. The three-terminal voltage in/voltage out operation of the
AD580 provides regulated output voltage without any
external components.
3. The AD580 provides a stable 2.5 V output voltage for input
voltages between 4.5 V and 30 V. The capability to provide
a stable output voltage using a 5 V input makes the AD580
an ideal choice for systems that contain a single logic
power supply.
4. Thin film resistor technology and tightly controlled bipolar
processing provide the AD580 with temperature stabilities
to 10 ppm/°C and long-term stability better than 250 µV.
5. The low quiescent current drain of the AD580 makes it
ideal for CMOS and other low power applications.
6. The AD580 is available in versions compliant with MIL-
STD-883. Refer to the Analog Devices Military Products
Data Book or the current AD580/AD883B data sheet for
detailed specifications.
. Patent Numbers 3,887,863; RE30,586.
TABLE OF CONTENTS Specifications.....................................................................................3
Absolute Maximum Ratings............................................................4
AD580 Chip Dimensions And Pad Layout...............................4
ESD Caution..................................................................................4
Theory of Operation........................................................................5
Voltage Variation versus Temperature.......................................5
Noise Performance.......................................................................6
The AD580 as a Current Limiter.................................................6
The AD580 as a Low Power, Low Voltage, Precision Reference
for Data Converters.......................................................................7
Outline Dimensions..........................................................................8
Ordering Guide.............................................................................8
REVISION HISTORY
8/04—Changed from Rev. A to Rev. B Updated Format................................................................Universal
SPECIFICATIONS
Table 1. VIN = 15 V and 25°C
Table 2. Specifications shown in boldface are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels. All min
ABSOLUTE MAXIMUM RATINGS
Table 3. 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 listed in the operational sections
of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
AD580 CHIP DIMENSIONS AND PAD LAYOUT Dimensions shown in inches and (millimeters).
00525-B
*BOTH EOUT PADS MUST BE CONNECTED TO THE OUTPUT.
0.075 (1.90)
EOUT*–E
0.046(1.16)Figure 2.
The AD580 is also available in chip form. Consult the factory
for specifications and applications information.
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.
THEORY OF OPERATION The AD580 family (AD580, AD581, AD584, AD589) uses the
bandgap concept to produce a stable, low temperature coef-
ficient voltage reference suitable for high accuracy data acqui-
sition 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 tran-
sistors have approximately a –2 mV/°C temperature coefficient,
unsuitable for use directly as a low TC reference. Extrapolation
of the temperature characteristic of any one of these devices to
absolute zero (with an emitter current propor-tional to the
absolute temperature), however, reveals that it will go to a VBE of
1.205 V at 0 K, as shown in Figure 3. Thus, if a voltage could be
developed with an opposing temperature coefficient to sum
with VBE to total 1.205 V, a 0 TC reference would result and
operation from a single, low voltage supply would be possible.
The AD580 circuit provides such a compensating voltage, V1 in
Figure 4, by driving two transistors at different current densities
and amplifying the resulting VBE difference (∆VBE—which now
has a positive TC). The sum, VZ, is then buffered and amplified
up to 2.5 V to provide a usable reference-voltage output. Figure
5 shows the schematic diagram of the AD580.
The AD580 operates as a 3-terminal reference, meaning that no
additional components are required for biasing or current
setting. The connection diagram, Figure 6, is quite simple.
0.5–273°C–200°C–100°C100°C0°C0K73K173K373K273K00525-B
TEMPERATURE
UNCTION V
LTAGE
(VFigure 3. Extrapolated Variation of Base-Emitter Voltage with Temperature
(IEαT), and Required Compensation, Shown for Two Different Devices
00525-B
2I1= I1
+VIN
COM
∆VBE
= 2.5VR4
= VBE + 2∆VBE
R1
= VBE + 2lnR1
= 1.205V= VBE + V1Figure 4. Basic Bandgap-Reference Regulator Circuit
00525-B
COM
2.5VOUTFigure 5. Schematic Diagram
00525-B
-006
Figure 6. Connection Diagram
VOLTAGE VARIATION VERSUS TEMPERATURE Some confusion exists in the area of defining and specifying
reference voltage error over temperature. Historically, references
are characterized using a maximum deviation per degree
Centigrade; i.e., 10 ppm/°C. However, because of the
inconsistent nonlinearities in Zener references (butterfly or S
type characteristics), most manufacturers use a maximum limit
error band approach to characterize their references. This
technique measures the output voltage at 3 to 5 different
temperatures and guarantees that the output voltage deviation
will fall within the guaranteed error band at these discrete
temperatures. This approach, of course, makes no mention or
The consistent voltage versus temperature performance of a
typical AD580 is shown in Figure 7. Note that the characteristic
is quasi-parabolic, not the possible S type characteristics of
classical Zener references. This parabolic characteristic permits
a maximum output deviation specification over the device’s full
operating temperature range, rather than just at 3 to 5 discrete
temperatures.
2.46–55–30025507510012500525-B
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)Figure 7. Typical AD580K Output Voltage vs. Temperature
The AD580M guarantees a maximum deviation of 1.75 mV
over the 0°C to 70°C temperature range. This can be shown to
be equivalent to 10 ppm/°C average maximum; i.e.,
averageCppmCmax/105.275.1°=×°
The AD580 typically exhibits a variation of 1.5 mV over the
power supply range of 7 V to 30 V. Figure 8 is a plot of AD580
line rejection versus frequency.
NOISE PERFORMANCE Figure 9 represents the peak-to-peak noise of the AD580 from
1 Hz (3 dB point) to a 3 dB high end shown on the horizontal
axis. Peak-to-peak noise from 1 Hz to 1 MHz is approximately
600 µV.
12000525-B
OUT
, p-p (mV)
1mV
100µV
10µV1001k10k100k1M
00525-B
FREQUENCY (Hz)
AK-TO-P
AK NOISFigure 9. Peak-to-Peak Output Noise vs. Frequency
00525-B
-010Figure 10. Input Current vs. Input Voltage (Integral Loads)
THE AD580 AS A CURRENT LIMITER The AD580 represents an excellent alternative to current limiter
diodes that require factory selection to achieve a desired
current. This approach often results in temperature coefficients
of 1%/C. The AD580 approach is not limited to a specially
selected factory set current limit; it can be programmed from
1 mA to 10 mA with the insertion of a single external resistor.
The approximate temperature coefficient of current limit for the
AD580 used in this mode is 0.13%/°C for ILIM = 1 mA and
0.01%/°C for ILIM = 13 mA (see Figure 11). Figure 10 displays
the high output impedance of the AD580 used as a current
limiter for ILIM = 1, 2, 3, 4, and 5 mA.
BOTTOM VIEW OF
AD580
OUTPUTLOAD
2.5V
2.5Vi≅
+ 1mA
