Datenblatt-Suchmaschine für elektronische Bauteile |
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AD581JH Datenblatt(PDF) 7 Page - Analog Devices |
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AD581JH Datenblatt(HTML) 7 Page - Analog Devices |
7 / 12 page AD581 Rev. C | Page 7 of 12 The error band which is guaranteed with the AD581 is the maximum deviation from the initial value at +25°C; this error band is of more use to a designer than one which simply guarantees the maximum total change over the entire range (that is, in the latter definition, all of the changes could occur in the positive direction). Thus, with a given grade of the AD581, the designer can easily determine the maximum total error from initial toler- ance plus temperature variation (for example, for the AD581T, the initial tolerance is ±10 mV, the temperature error band is ±15 mV, thus the unit is guaranteed to be 10.000 V ±25 mV from −55°C to +125°C). OUTPUT CURRENT CHARACTERISTICS The AD581 has the capability to either source or sink current and provide good load regulation in either direction, although it has better characteristics in the source mode (positive current into the load). The circuit is protected for shorts to either positive supply or ground. The output voltage vs. output current charac- teristics of the device are shown in Figure 6. Source current is displayed as negative current in the figure; sink current is positive. Note that the short-circuit current (that is, 0 V output) is about 28 mA; when shorted to +15 V, the sink current goes to about 20 mA. –20 –15 –10 –5 0 5 10 15 20 14 12 10 8 6 4 2 0 OUTPUT CURRENT (mA) SOURCE SINK +VS = 15V TA = 25°C Figure 6. Output Voltage vs. Sink and Source Current DYNAMIC PERFORMANCE Many low power instrument manufacturers have been in- creasingly concerned with the turn-on characteristics of the components used in their systems. Fast turn-on components often enable the end user to keep power off when not needed, and yet respond quickly when the power is turned on for operation. Figure 7 displays the turn-on characteristic of the AD581. This characteristic is generated from a cold start operation and repre- sents the true turn-on waveform after an extended period with the supplies off. The figure shows both the coarse and fine transient characteristics of the device; the total settling time to within ±10 mV is about 180 μs, and there is no long thermal tail appearing after the point. 0 50 100 150 200 250 12V 11V 10V 20V 10V 0V 10.03V 10.02V 10.01V 10.00V SETTLING TIME (µs) Figure 7. Output Settling Characteristic 1000 1 10 1M FREQUENCY (Hz) 100 1k 10k 100k 10 100 NOISE SPECTRAL DENSITY (nV/ Hz) TOTAL NOISE (µV rms) UP TO SPECIFIED FREQUENCY Figure 8. Spectral Noise Density and Total rms Noise vs. Frequency 1000 500 TEMPERATURE (°C) –50 –55 –40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90 100 110 120 125 900 800 700 600 1.5µA/°C Figure 9. Quiescent Current vs. Temperature |
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