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AD688AQ Folha de dados(PDF) 11 Page - Analog Devices |
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AD688AQ Folha de dados(HTML) 11 Page - Analog Devices |
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11 / 16 page  AD688 Rev. B | Page 11 of 16 DYNAMIC PERFORMANCE The output buffer amplifiers (A3 and A4) are designed to provide the AD688 with static and dynamic load regulation superior to less complete references. Many A/D and D/A converters present transient current loads to the reference, and poor reference response can degrade the converter’s performance. Figure 20, Figure 21, and Figure 22 display the characteristic of the AD688 output amplifier driving a 0 mA to 10 mA load. 10V A3 OR A4 VOUT IL 1k Ω 10V 0V VL Figure 20. Transient Load Test Circuit VOUT VL 200mV 5V 500ns 100 90 10 Figure 21. Large-Scale Transient Response 100 90 10 0% 1mV 5V 2 µs VOUT VL Figure 22. Fine-Scale Settling for Transient Load Figure 23 and Figure 24 display the output amplifier characteristic driving a 5 mA to 10 mA load, a common situation found when the reference is shared among multiple converters or is used to provide bipolar offset current. 10V A3 OR A4 VOUT IL 10V 0V VL + – 2k Ω 2k Ω Figure 23. Transient and Constant Load Test Circuit 100 90 10 0% 1mV 200mV 1 µs VOUT 200mV/ CM VOUT 1mV/CM 5V VL Figure 24. Transient Response 5 mA to 10 mA Load In some applications, a varying load may be both resistive and capacitive in nature, or may be connected to the AD688 by a long capacitive cable. Figure 25 and Figure 26 display the output amplifier characteristics driving a 1000 pF, 0 mA to 10 mA load. 10V VOUT 10V 0V VL 1k Ω 1000pF CL Figure 25. Capacitive Load Transient Response Test Circuit 100 90 10 0% 5V 200mV 1 µs CL = 0 CL = 1000pF VL Figure 26. Output Response with Capacitive Load Figure 27 and Figure 28 display the crosstalk between output amplifiers. The top trace shows the output of A4, dc-coupled and offset by 10 V, while the output of A3 is subjected to a 0 mA to 10 mA load current step. The transient at A4 settles in about 1 µs, and the load-induced offset is about 100 µV. |
Nº de peça semelhante - AD688AQ |
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Descrição semelhante - AD688AQ |
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