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AD210 bảng dữ liệu(PDF) 6 Page - Analog Devices |
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AD210 bảng dữ liệu(HTML) 6 Page - Analog Devices |
6 / 8 page AD210 REV. A –6– Isolated Power: The AD210 provides isolated power at the input and output ports. This power is useful for various signal conditioning tasks. Both ports are rated at a nominal ±15 V at 5 mA. The load characteristics of the isolated power supplies are shown in Figure 15. For example, when measuring the load rejection of the input isolated supplies VISS, the load is placed between +VISS and –VISS. The curves labeled VISS and VOSS are the individual load rejection characteristics of the input and the output supplies, respectively. There is also some effect on either isolated supply when loading the other supply. The curve labeled CROSSLOAD indicates the sensitivity of either the input or output supplies as a function of the load on the opposite supply. 30 20 510 0 25 CURRENT – mA VOSS VOSS VISS VISS SIMULTANEOUS SIMULTANEOUS CROSSLOAD Figure 15. Isolated Power Supplies vs. Load Lastly, the curves labeled VOSS simultaneous and VISS simulta- neous indicate the load characteristics of the isolated power sup- plies when an equal load is placed on both supplies. The AD210 provides short circuit protection for its isolated power supplies. When either the input supplies or the output supplies are shorted to input common or output common, respectively, no damage will be incurred, even under continuous application of the short. However, the AD210 may be damaged if the input and output supplies are shorted simultaneously. 100 50 1 0 75 LOAD – mA –VOSS +VISS 25 0 +VOSS –VISS 234567 Figure 16a. Isolated Supply Ripple vs. Load (External 4.7 µF Bypass) Under any circumstances, care should be taken to ensure that the power supplies do not accidentally become shorted. The isolated power supplies exhibit some ripple which varies as a function of load. Figure 16a shows this relationship. The AD210 has internal bypass capacitance to reduce the ripple to a point where performance is not affected, even under full load. Since the internal circuitry is more sensitive to noise on the negative supplies, these supplies have been filtered more heavily. Should a specific application require more bypassing on the iso- lated power supplies, there is no problem with adding external capacitors. Figure 16b depicts supply ripple as a function of external bypass capacitance under full load. 1V 10mV 0.1µF 100mV 1mV CAPACITANCE 1µF 10µF 100µF ( ) +VISS +VOSS ( ) –VISS –VOSS Figure 16b. Isolated Power Supply Ripple vs. Bypass Capacitance (Volts p-p, 1 MHz Bandwidth, 5 mA Load) APPLICATIONS EXAMPLES Noise Reduction in Data Acquisition Systems: Transformer coupled isolation amplifiers must have a carrier to pass both ac and dc signals through their signal transformers. Therefore, some carrier ripple is inevitably passed through to the isolator output. As the bandwidth of the isolator is increased more of the carrier signal will be present at the output. In most cases, the ripple at the AD210’s output will be insignificant when com- pared to the measured signal. However, in some applications, particularly when a fast analog-to-digital converter is used fol- lowing the isolator, it may be desirable to add filtering; other- wise ripple may cause inaccurate measurements. Figure 17 shows a circuit that will limit the isolator’s bandwidth, thereby reducing the carrier ripple. VOUT 15 30 29 +VOSS +VISS –VISS +15V 2 4 –VOSS 14 1 0.001µF 0.002µF R (k Ω) = ( ) 112.5 fC (kHz) AD542 +VOSS –VOSS 3 VSIG 19 18 AD210 R R 16 17 Figure 17. 2-Pole, Output Filter Self-Powered Current Source The output circuit shown in Figure 18 can be used to create a self-powered output current source using the AD210. The 2 k Ω resistor converts the voltage output of the AD210 to an equiva- |
Số phần tương tự - AD210_15 |
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Mô tả tương tự - AD210_15 |
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