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ADR01BR Folha de dados(PDF) 9 Page - Analog Devices |
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ADR01BR Folha de dados(HTML) 9 Page - Analog Devices |
9 / 20 page ADR01/ADR02/ADR03/ADR06 Rev. F | Page 9 of 20 PARAMETER DEFINITIONS Temperature Coefficient The change of output voltage with respect to operating tem- perature 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 milliampere, 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: ) ( ) ( 1 O 0 O O t V t V V − = ∆ 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 100 hours of operation at 25°C The majority of the shift is seen in the first 200 hours, and, as time goes by, the drift decreases significantly. So for the subsequent 1,000 hours’ time points, this drift is much smaller than the first. Thermal Hysteresis Defined as the change of output voltage after the device is cycled through temperature 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. TC O O HYS O V C V V _ _ ) 25 ( − ° = 6 _ _ 10 ) 25 ( ) 25 ( ] [ × ° − ° = C V V C V ppm V O TC O O HYS O where: VO(25°C) = VO at 25°C VO_TC = VO at 25°C after temperature cycle at +25°C to –40°C to +125°C and back to +25°C NOTES Input Capacitor Input capacitors are not required on the ADR01/ADR02/ ADR03/ADR06. 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 to reduce noise from the supply. Output Capacitor The ADR01/ADR02/ADR03/ADR06 do 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 be improved with an additional 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. |
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Descrição semelhante - ADR01BR |
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