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ADR1500 Folha de dados(PDF) 7 Page - Analog Devices |
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ADR1500 Folha de dados(HTML) 7 Page - Analog Devices |
7 / 8 page ADR1500 Rev. 0 | Page 7 of 8 OUTPUT ERROR 1mV/DIV 2µs/DIV OUTPUT 0.5mV/DIV 2ms/DIV 2.4V 0V VIN Figure 10. Turn-On Settling Time Attempts to drive a large capacitive load (in excess of 1000 pF) can result in ringing. This is due to the additional poles formed by the load capacitance and the output impedance of the reference. A recommended method for driving capacitive loads of this magnitude is shown in Figure 11. + – VR VOUT CL RS = 11.5kΩ VIN RL Figure 11. Turn-On, Settling, and Transient Test Circuit TRANSIENT RESPONSE Many ADCs and DACs present transient current loads to the reference. Poor reference response can degrade the converter’s performance. Figure 12 displays both the coarse and fine settling characteristics of the device to load transient of ±50 μA. It shows the settling characteristics of the device for an increased reverse current of 50 μA and the response when the reverse current is decreased by 50 μA. The transients settle to 1 mV in about 3 μs. IR = 100µA + 50µA STEP IR = 100µA – 50µA STEP 1µs/DIV 20mV/DIV 1mV/DIV 20mV/DIV 1mV/DIV Figure 12. Transient Settling Time A resistor isolates the capacitive load from the output stage, while the capacitor provides a single-pole, low-pass filter and lowers the output noise. |
Nº de peça semelhante - ADR1500_15 |
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Descrição semelhante - ADR1500_15 |
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