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AD584LH Arkusz danych(PDF) 5 Page - Analog Devices |
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AD584LH Arkusz danych(HTML) 5 Page - Analog Devices |
5 / 8 page AD584 REV. A –5– 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 Maxi- mum Error Band (see Figure 4) specified for a particular grade (i.e., S and T grades); three-point measurement guarantees per- formance within the error band from 0 °C to +70°C (i.e., J, K, or L 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 designer can easily determine the maximum total error from initial tolerance plus temperature variation. For example, for the AD584T, the initial tolerance is ±l0 mV and the error band is ±15 mV. Hence, the unit is guar- anteed to be 10.000 volts ±25 mV from –55°C to +125°C. Figure 4. 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 posi- tive supply or ground. The output voltage vs. output current characteristics of the device is shown in Figure 5. Source current is displayed as negative current in the figure; sink current is positive. Note that the short circuit current (i.e., zero volts out- put) is about 28 mA; when shorted to +15 volts, the sink cur- rent goes to about 20 mA. Figure 5. AD584 Output Voltage vs. Sink and Source Current DYNAMIC PERFORMANCE Many low power instrument manufacturers are becoming in- creasingly concerned with the turn-on characteristics of the components being used in their systems. Fast turn-on compo- nents 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 6 displays the turn-on characteristic of the AD584. Figure 6a is generated from cold-start operation and represents 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 millivolt is about 180 µs, and there is no long ther- mal tail appearing after the point. Figure 6. Output Settling Characteristic NOISE FILTERING The bandwidth of the output amplifier in the AD584 can be re- duced to filter the output noise. A capacitor ranging between 0.01 µF and 0.1 µF connected between the Cap and V BG termi- nals will further reduce the wideband and feedthrough noise in the output of the AD584, as shown in Figure 8. However, this will tend to increase the turn-on settling time of the device so ample warm-up time should be allowed. Figure 7. Additional Noise Filtering with an External Capacitor Figure 8. Spectral Noise Density and Total rms Noise vs. Frequency |
Podobny numer części - AD584LH |
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Podobny opis - AD584LH |
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