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AS111R Datasheet(PDF) 9 Page - Austin Semiconductor |
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AS111R Datasheet(HTML) 9 Page - Austin Semiconductor |
9 / 22 page V V V V Volta olta olta olta oltagggggeeeee Comparator Comparator Comparator Comparator Comparator AS111 RAD-TOL AustinSemiconductor,Inc.reservestherighttochangeproductsorspecificationswithoutnotice. 9 AS111 RAD-TOL Rev. 1.1 06/05 Austin Semiconductor, Inc. PRELIMINARY SPECIFICATION Schematic Diagram20 CIRCUIT TECHNIQUES FOR AVOIDING OSCILLATIONS IN COMPARATOR APPLICATIONS When a high-speed comparator such as the AS111 is used with fast input signals and low source impedances, the output response will normally be fast and stable, assuming that the power supplies have been bypassed (with 0.1 µF disc capaci- tors), and that the output signal is routed well away from the inputs (pins 2 and 3) and also away from pins 5 and 6. However, when the input signal is a voltage ramp or a slow sine wave, or if the signal source impedance is high (1 kW to 100 kW), the comparator may burst into oscillation near the crossing-point. This is due to the high gain and wide bandwidth of comparators like the AS111. To avoid oscillation or instability in such a usage, several precautions are recom- mended, as shown in Figure 1 below. 1. The trim pins (pins 5 and 6) act as unwanted auxiliary inputs. If these pins are not connected to a trim-pot, they should be shorted together. If they are connected to a trim- pot, a 0.01 µF capacitor C1 between pins 5 and 6 will minimize the susceptibility to AC coupling. A smaller capacitor is used if pin 5 is used for positive feedback as in Figure 1. 2. Certain sources will produce a cleaner comparator out put waveform if a 100 pF to 1000 pF capacitor C2 is connected directly across the input pins. 3. When the signal source is applied through a resistive network, R S , it is usually advantageous to choose an R S ’ of substantially the same value, both for DC and for dynamic (AC) considerations. Carbon, tin-oxide, and metal-film resistors have all been used successfully in comparator input circuitry. Inductive wirewound resistors are not suitable. (continued) NOTE 20: Pin connections shown on schematic diagram are for the TO08 can package. |
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