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AD586KRZ1 데이터시트(PDF) 8 Page - Analog Devices |
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AD586KRZ1 데이터시트(HTML) 8 Page - Analog Devices |
8 / 16 page AD586 Rev. G | Page 8 of 16 CN = 1µF NO CN 50 µS 200 µV Figure 8. Effect of 1 µF Noise Reduction Capacitor on Broadband Noise TURN-ON TIME Upon application of power (cold start), 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. Two compo- nents normally associated with this are the time for the active circuits to settle, and the time for the thermal gradients on the chip to stabilize. Figure 9, Figure 10, and Figure 11 show the turn-on characteristics of the AD586. It shows the settling to be about 60 µs to 0.01%. Note the absence of any thermal tails when the horizontal scale is expanded to l ms/cm in Figure 10. 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 current source of the internal Zener diode, 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 11). VIN VOUT 10V 1mV 20 µS Figure 9. Electrical Turn-On VIN VOUT 10V 5V 1mS Figure 10. Extended Time Scale VIN VOUT 10V 1mV 100mS Figure 11. Turn-On with 1µF CN Characteristics DYNAMIC PERFORMANCE The output buffer amplifier is designed to provide the AD586 with static and dynamic load regulation superior to less com- plete references. Many ADCs and DACs present transient current loads to the reference, and poor reference response can degrade the per- formance of the converter. Figure 12, Figure 13, and Figure 14 display the characteristics of the AD586 output amplifier driving a 0 mA to 10 mA load. AD586 VL 5V 0V VOUT 500 Ω 3.5V Figure 12. Transient Load Test Circuit |
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