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AD580 Datasheet(HTML) 4 Page - Analog Devices

 4 / 6 pageAD580REV. A–4–Figure 3. AD580 Schematic DiagramFigure 4. AD580 Connection DiagramVOLTAGE VARIATION VS. TEMPERATURESome confusion exists in the area of defining and specifyingreference voltage error over temperature. Historically, referencesare characterized using a maximum deviation per degree Centi-grade; i.e., 10 ppm/°C. However, because of the inconsistentnonlinearities in Zener references (butterfly or “S” type charac-teristics), most manufacturers use a maximum limit error bandapproach to characterize their references. This technique mea-sures the output voltage at 3 to 5 different temperatures andguarantees that the output voltage deviation will fall within theguaranteed 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 isquasi-parabolic, not the possible “S” type characteristics of clas-sical Zener references. This parabolic characteristic permits amaximum output deviation specification over the device’s fulloperating temperature range, rather than just at 3 to 5 discretetemperatures.Figure 5. Typical AD580K Output Voltage vs. TemperatureThe AD580M guarantees a maximum deviation of 1.75 mVover the 0°C to +70°C temperature range. This can be shown tobe equivalent to 10 ppm/°C average maximum; i.e.,1.75 mV max70°C×12.5V=10 ppm/°C max averageThe AD580 typically exhibits a variation of 1.5 mV over thepower supply range of 7 volts to 30 volts. Figure 6 is a plot ofAD580 line rejection versus frequency.NOISE PERFORMANCEFigure 7 represents the peak-to-peak noise of the AD580 from1 Hz (3 dB point) to a 3 dB high end shown on the horizontalaxis. Peak-to-peak noise from 1 Hz to 1 MHz is approximately600µV.Figure 6. AD580 Line Rejection PlotFigure 7. Peak-to-Peak Output Noise vs. Frequency

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