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AD680JN Datasheet(PDF) 7 Page - Analog Devices |
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AD680JN Datasheet(HTML) 7 Page - Analog Devices |
7 / 12 page AD680 Rev. H | Page 7 of 12 500 μV 100 90 0% 10 50 μs 500 μV Figure 7. Broadband Noise at 300 kHz 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 components 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. The turn-on settling time of the AD680 is about 20 μs to within 0.025% of its final value, as shown in Figure 8. VIN VOUT 100 90 0% 10 10 μs 5V 1mV Figure 8. Turn-On Settling Time The AD680 thermal settling characteristic benefits from its compact design. Once initial turn-on is achieved, the output linearly approaches its final value; the output is typically within 0.01% of its final value after 25 ms. DYNAMIC PERFORMANCE The output stage of the amplifier is designed to provide the AD680 with static and dynamic load regulation superior to less complete references. Figure 9 to Figure 11 display the char- acteristics of the AD680 output amplifier driving a 0 mA to 10 mA load. Longer settling times result if the reference is forced to sink any transient current. In some applications, a varying load may be both resistive and capacitive in nature, or the load may be connected to the AD680 by a long capacitive cable. AD680 +VIN VOUT VOUT VOUT 0V VL 249 Ω 0.1 μF Figure 9. Transient Load Test Circuit VOUT VL 100 90 0% 10 5 μs 50mV 2V Figure 10. Large Scale Transient Response VOUT VIN 100 90 0% 10 5 μs 5mV 2V Figure 11. Fine Scale Settling for Transient Load |
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