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AD580J 数据表(PDF) 3 Page - Analog Devices

部件名 AD580J
功能描述  High Precision 2.5 V IC Reference
Download  6 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD580J 数据表(HTML) 3 Page - Analog Devices

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AD580
REV. A
–3–
ABSOLUTE MAXIMUM RATINGS
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 V
Power Dissipation @ +25
°C
Ambient Temperature . . . . . . . . . . . . . . . . . . . . . . . 350 mW
Derate above +25
°C . . . . . . . . . . . . . . . . . . . . . . . 2.8 mW/°C
Lead Temperature (Soldering 10 sec) . . . . . . . . . . . . . +300
°C
Thermal Resistance
Junction-to-Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
°C
Junction-to-Ambient . . . . . . . . . . . . . . . . . . . . . . . 360
°C/W
AD580 CHIP DIMENSIONS
AND PAD LAYOUT
Dimensions shown in inches and (mm).
The AD580 is also available in chip form. Consult the factory
for specifications and applications information.
THEORY OF OPERATION
The AD580 family (AD580, AD581, AD584, AD589) uses
the “bandgap” concept to produce a stable, low temperature
coefficient voltage reference suitable for high accuracy data ac-
quisition 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 transis-
tors have approximately a –2 mV/
°C temperature coefficient,
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 emitter current proportional
to absolute temperature) reveals that it will go to a VBE of 1.205
volts at 0K, as shown in Figure 1. Thus, if a voltage could be
developed with an opposing temperature coefficient to sum with
VBE to total 1.205 volts, a zero-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 2, 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 volts to provide a usable reference-voltage output. Fig-
ure 3 is the schematic diagram of the AD580.
The AD580 operates as a three-terminal reference, which means
that no additional components are required for biasing or cur-
rent setting. The connection diagram, Figure 4 is quite simple.
Figure 1. Extrapolated Variation of Base-Emitter Voltage
with Temperature (IEαT), and Required Compensation,
Shown for Two Different Devices
Figure 2. Basic Bandgap-Reference Regulator Circuit


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