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AD584T Scheda tecnica(PDF) 7 Page - Analog Devices |
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AD584T Scheda tecnica(HTML) 7 Page - Analog Devices |
7 / 12 page Data Sheet AD584 Rev. C | Page 7 of 12 PERFORMANCE OVER TEMPERATURE Each AD584 is tested at three temperatures over the −55°C to +125°C range to ensure that each device falls within the maximum error band (see Figure 6) specified for a particular grade (that is, S and T grades); three-point measurement guarantees performance within the error band from 0°C to 70°C (that is, J and K grades). The error band guaranteed for the AD584 is the maximum deviation from the initial value at 25°C. Thus, given the grade of the AD584, the maximum total error from the initial tolerance plus the temperature variation can easily be determined. For example, for the AD584T, the initial tolerance is ±10 mV, and the error band is ±15 mV. Therefore, the unit is guaranteed to be 10.000 V ± 25 mV from −55°C to +125°C. Figure 6. Typical Temperature Characteristic OUTPUT CURRENT CHARACTERISTICS The AD584 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. Figure 7 shows the output voltage vs. the output current characteristics of the device. Source current is displayed as negative current in the figure, and sink current is displayed as positive current. The short-circuit current (that is, 0 V output) is about 28 mA; however, when shorted to 15 V, the sink current goes to approximately 20 mA. Figure 7. Output Voltage vs. Output Current (Sink and Source) DYNAMIC PERFORMANCE Many low power instrument manufacturers are becoming increasingly concerned with the turn-on characteristics of the components being 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. Figure 8 displays the turn-on characteristic of the AD584. Figure 8 is generated from cold-start operation and represents the true turn-on waveform after an extended period with the supplies off. Figure 8 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. Figure 8. Output Settling Characteristic 10.005 10.000 9.995 –55 0 25 70 125 TEMPERATURE (°C) OUTPUT CURRENT (mA) 0 5 10 15 20 –5 –10 –15 SINK SOURCE –20 14 12 10 8 6 4 2 0 +VS = 15V TA = 25°C SETTLING TIME (µs) 100 150 200 250 50 0 10.03V 10.02V 12V 11V 10V 20V 10V 0V 10.01V 10.00V OUTPUT OUTPUT POWER SUPPLY INPUT |
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