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AD580TCHIPS データシート(PDF) 6 Page - Analog Devices |
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AD580TCHIPS データシート(HTML) 6 Page - Analog Devices |
6 / 8 page AD580 Rev. B | Page 6 of 8 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. 2.51 2.50 2.49 2.48 2.47 2.46 –55 –30 0 25 50 75 100 125 TEMPERATURE ( °C) MAXIMUM VOLTAGE CHANGE FROM 0 °C TO 70°C 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., average C ppm V C mV max / 10 5 . 2 1 70 max 75 . 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. 140 130 0 10 20 30 40 50 60 70 80 90 100 110 120 10 100 1k 10k 100k LINE FREQUENCY (Hz) AD580 k e OUT p-p e = 23V p-p E = 18.5V E IN COMPOSITE (17V ≤ V IN ≤ 30V) Figure 8. AD580 Line Rejection Plot 1mV 100 µV 10 µV 0 100 1k 10k 100k 1M FREQUENCY (Hz) Figure 9. Peak-to-Peak Output Noise vs. Frequency 5V 500 µA Figure 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 2.5V PRECISION REFERENCE CIRCUIT IN TO-52 CASE AD580 V+ V– OUTPUT R LOAD 2.5V 2.5V R i ≅ + 1mA Figure 11. A Two-Component Precision Current Limiter |
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