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ADR392ART-RL Datenblatt(PDF) 8 Page - Analog Devices |
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ADR392ART-RL Datenblatt(HTML) 8 Page - Analog Devices |
8 / 20 page ADR390/ADR391/ADR392/ADR395 Rev. F | Page 8 of 20 TERMINOLOGY Temperature Coefficient The change of output voltage with respect to operating temp- erature changes normalized by the output voltage at 25°C. This parameter is expressed in ppm/°C and can be determined by the following equation: [] () ( ) () () 6 10 – 25 – × × ° = ° 1 2 O 1 O 2 O O T T C V T V T V C / ppm TCV where: VO (25°C) = VO at 25°C VO (T1) = VO at Temperature 1 VO (T2) = VO at Temperature 2 Line Regulation The change in output voltage due to a specified change in input voltage. This parameter accounts for the effects of self-heating. Line regulation is expressed in either percent per volt, parts- per-million per volt, or microvolts per volt change in input voltage. Load Regulation The change in output voltage due to a specified change in load current. This parameter accounts for the effects of self-heating. Load regulation is expressed in either microvolts per milli- ampere, parts-per-million per milliampere, or ohms of dc output resistance. Long-Term Stability Typical shift of output voltage at 25°C on a sample of parts subjected to a test of 1,000 hours at 25°C. ∆ VO = VO(t0) – VO(t1) [] () () () ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ × = ∆ 6 10 – 0 O 1 O 0 O O t V t V t V ppm V where: VO (T0) = VO at 25°C at Time 0 VO (T1) = VO at 25°C after 1,000 hours operation at 25°C Thermal Hysteresis The change of output voltage after the device is cycled through temperatures from +25°C to –40°C to +125°C and back to +25°C. This is a typical value from a sample of parts put through such a cycle. VO_HYS = VO(25°C) – VO_TC [] ( ) () 6 10 25 – 25 × ° ° = C V V C V ppm V O O_TC O O_HYS where: VO (25°C) = VO at 25°C VO_TC = VO at 25°C after a temperature cycle from + 25°C to –40°C to +125°C and back to +25°C NOTES Input Capacitor Input capacitors are not required on the ADR39x. There is no limit for the value of the capacitor used on the input, but a 1 µF to 10 µF capacitor on the input improves transient response in applications where the supply suddenly changes. An additional 0.1 µF in parallel also helps reduce noise from the supply. Output Capacitor The ADR39x does not require output capacitors for stability under any load condition. An output capacitor, typically 0.1 µF, filters out any low level noise voltage and does not affect the operation of the part. On the other hand, the load transient response can improve with the addition of a 1 µF to 10 µF output capacitor in parallel. A capacitor here acts as a source of stored energy for a sudden increase in load current. The only parameter that degrades by adding an output capacitor is the turn-on time, and it depends on the size of the capacitor chosen. –150 150 TIME (Hours) 0 –100 –50 0 50 100 100 200 300 400 500 600 700 1000 900 800 Figure 2. ADR391 Typical Long-Term Drift over 1,000 Hours |
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