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AD780BR Folha de dados(PDF) 8 Page - Analog Devices |
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AD780BR Folha de dados(HTML) 8 Page - Analog Devices |
8 / 12 page AD780 Data Sheet Rev. F | Page 8 of 12 Notice how sensitive the current dependent factor on VOUT is. A large amount of current, even in tens of microamp, drawn from the TEMP pin can cause the VOUT and TEMP output to fail. The choice of C1 and C2 was dictated primarily by the need for a relatively flat response that rolled off early in the high frequency noise at the output. However, there is considerable margin in the choice of these capacitors. For example, the user can actually put a huge C2 on the TEMP pin with none on the output pin. However, one must either put very little or a lot of capacitance at the TEMP pin. Intermediate values of capacitance can sometimes cause oscillation. In any case, the user should follow the recommendation in Figure 6. TEMPERATURE TRANSDUCER CIRCUIT The circuit shown in Figure 13 is a temperature transducer that amplifies the TEMP output voltage by a gain of a little over +5 to provide a wider full-scale output range. The digital potentiometer can be used to adjust the output so it varies by exactly 10 mV/°C. To minimize resistance changes with temperature, resistors with low temperature coefficients, such as metal film resistors, should be used. AD780 GND RB 1.27k Ω (1%) RF 6.04k Ω (1%) 4 +VIN 2 3 1 µF TEMP RBP 200 Ω AD820 10mV/ °C 5V Figure 13. Differential Temperature Transducer SUPPLY CURRENT OVER TEMPERATURE The AD780’s quiescent current varies slightly over temperature and input supply range. The test limit is 1 mA over the industrial and 1.3 mA over the military temperature range. Typical performance with input voltage and temperature variation is shown in Figure 14. 0.85 0.80 0.75 0.70 0.65 0.60 4 36 INPUT VOLTAGE (V) –55 °C +25 °C +125 °C Figure 14. Typical Supply Current over Temperature TURN-ON TIME The time required for the output voltage to reach its final value within a specified error band is defined as the turn-on settling time. The two major factors that affect this are the active circuit settling time and the time for the thermal gradients on the chip to stabilize. Typical settling performance is shown in Figure 15. The AD780 settles to within 0.1% of its final value within 10 µs. 5V 0V 2.500V 2.499V 2.498V 10 µs/DIV VIN VOUT Figure 15. Turn-On Settling Time Performance DYNAMIC PERFORMANCE The output stage of the AD780 has been designed to provide superior static and dynamic load regulation. Figure 16 and Figure 17 show the performance of the AD780 while driving a 0 mA to 10 mA load. |
Nº de peça semelhante - AD780BR |
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Descrição semelhante - AD780BR |
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