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AD587JCHIPS Folha de dados(PDF) 5 Page - Analog Devices |
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AD587JCHIPS Folha de dados(HTML) 5 Page - Analog Devices |
5 / 12 page REV. F AD587 –5– Output turn-on time is modified when an external noise reduc- tion capacitor is used. When present, this capacitor acts as an additional load to the internal Zener diode’s current source, resulting in a somewhat longer turn-on time. In the case of a 1 µF capacitor, the initial turn-on time is approximately 400 ms to 0.01% (see Figure 5c). a. Electrical Turn-On b. Extended Time Scale c. Turn-On with 1 µF CN Figure 5. Turn-On Characteristics DYNAMIC PERFORMANCE The output buffer amplifier is designed to provide the AD587 with static and dynamic load regulation superior to less complete references. Many ADCs and DACs present transient current loads to the reference, and poor reference response can degrade the converter’s performance. Figures 6b and 6c display the characteristics of the AD587 output amplifier driving a 0 mA to 10 mA load. AD587 VOUT 7.0V 1k Ω VL 10V 0V Figure 6a. Transient Load Test Circuit Figure 6b. Large-Scale Transient Response Figure 6c. Fine Scale Setting for Transient Load |
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