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AD713JCHIPS Folha de dados(PDF) 7 Page - Analog Devices |
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AD713JCHIPS Folha de dados(HTML) 7 Page - Analog Devices |
7 / 14 page REV. C AD713 –7– MEASURING AD713 SETTLING TIME The photos of Figures 2 and 3 show the dynamic response of the AD713 while operating in the settling time test circuit of Figure 1. The input of the settling time fixture is driven by a flat-top pulse generator. The error signal output from the false summing node of A1, the AD713 under test, is clamped, ampli- fied by op amp A2 and then clamped again. Figure 1. Settling Time Test Circuit Figure 2. Settling Characteristics 0 V to +10 V Step. Upper Trace: Output of AD713 Under Test (5 V/div). Lower Trace: Amplified Error Voltage (0.01%/div) The error signal is thus clamped twice: once to prevent overload- ing amplifier A2 and then a second time to avoid overloading the oscilloscope preamp. A Tektronix oscilloscope preamp type 7A26 was carefully chosen because it recovers from the approximately 0.4 V overload quickly enough to allow accurate measurement of the AD713’s 1 µs settling time. Amplifier A2 is a very high speed FET input op amp; it provides a voltage gain of 10, am- plifying the error signal output of the AD713 under test (providing an overall gain of 5). Figure 3. Settling Characteristics to –10 V Step. Upper Trace: Output of AD713 Under Test (5 V/div). Lower Trace: Amplified Error Voltage (0.01%/ div) POWER SUPPLY BYPASSING The power supply connections to the AD713 must maintain a low impedance to ground over a bandwidth of 4 MHz or more. This is especially important when driving a significant resistive or capacitive load, since all current delivered to the load comes from the power supplies. Multiple high quality bypass capacitors are recommended for each power supply line in any critical application. A 0.1 µF ceramic and a 1 µF electrolytic capacitor as shown in Figure 4 placed as close as possible to the amplifier (with short lead lengths to power supply common) will assure adequate high frequency bypassing in most applications. A minimum bypass capacitance of 0.1 µF should be used for any application. Figure 4. Recommended Power Supply Bypassing |
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