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AD780BR-REEL7 Datasheet(PDF) 9 Page - Analog Devices |
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AD780BR-REEL7 Datasheet(HTML) 9 Page - Analog Devices |
9 / 12 page Data Sheet AD780 Rev. F | Page 9 of 12 AD780 4 +VIN 2 6 1 µF VOUT 249 Ω VL VOUT 0V Figure 16. Transient Resistive Load Test Circuit 0mA 10mA 10 µs/DIV ILOAD VOUT (CL = 0pF) Figure 17. Settling under Transient Resistive Load The dynamic load may be resistive and capacitive. For example, the load may be connected via a long capacitive cable. Figure 18 and Figure 19 show the performance of the AD780 driving a 1000 pF, 0 mA to 10 mA load. AD780 4 +VIN 2 6 1 µF VOUT 249 Ω VL VOUT 0V CL 1000pF Figure 18. Capacitive Load Transient Response Test Circuit 0mA 10mA 10 µs/DIV ILOAD VOUT (CL = 1000pF) Figure 19. Settling under Dynamic Capacitive Load LINE REGULATION Line regulation is a measure of change in output voltage due to a specified change in input voltage. It is intended to simulate worst-case unregulated supply conditions and is measured in µV/V. Figure 20 shows typical performance with 4.0 V < VIN < 15.0 V. 200 100 0 –100 –200 4 15 10 INPUT VOLTAGE (V) T = 25 °C Figure 20. Output Voltage Change vs. Input Voltage PRECISION REFERENCE FOR HIGH RESOLUTION 5 V DATA CONVERTERS The AD780 is ideally suited to be the reference for most 5 V high resolution ADCs. The AD780 is stable under any capacitive load, has superior dynamic load performance, and its 3.0 V output provides the converter with the maximum dynamic range without requiring an additional and expensive buffer amplifier. One of the many ADCs that the AD780 is suited for is the AD7884, a 16-bit, high speed sampling ADC (see Figure 21). This part previously needed a precision 5 V reference, resistor divider, and buffer amplifier to do this function. |
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