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AD580 Datasheet(PDF) 4 Page - Analog Devices

Part # AD580
Description  High Precision 2.5 V IC Reference
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD580 Datasheet(HTML) 4 Page - Analog Devices

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AD580
REV. A
–4–
Figure 3. AD580 Schematic Diagram
Figure 4. AD580 Connection Diagram
VOLTAGE VARIATION VS. 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 Centi-
grade; i.e., 10 ppm/
°C. However, because of the inconsistent
nonlinearities in Zener references (butterfly or “S” type charac-
teristics), most manufacturers use a maximum limit error band
approach to characterize their references. This technique mea-
sures 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 ap-
proach, of course, makes no mention or guarantee of perfor-
mance at any other temperature within the operating tempera-
ture range of the device.
The consistent Voltage vs. Temperature performance of a typi-
cal AD580 is shown in Figure 5. Note that the characteristic is
quasi-parabolic, not the possible “S” type characteristics of clas-
sical 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.
Figure 5. 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.,
1.75 mV max
70
°C
×
1
2.5V
=10 ppm/°C max average
The AD580 typically exhibits a variation of 1.5 mV over the
power supply range of 7 volts to 30 volts. Figure 6 is a plot of
AD580 line rejection versus frequency.
NOISE PERFORMANCE
Figure 7 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.
Figure 6. AD580 Line Rejection Plot
Figure 7. Peak-to-Peak Output Noise vs. Frequency


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