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AD580 Arkusz danych(PDF) 4 Page - Analog Devices |
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AD580 Arkusz danych(HTML) 4 Page - Analog Devices |
4 / 6 page 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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