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CA3060E Datasheet(PDF) 10 Page - Intersil Corporation |
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CA3060E Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 12 page 3-10 The circuit diagram of a tri-level comparator appears in Figure 22. Power is provided for the CA3060 via terminal 3 and 8 by ±6V supplies and the built-in regulator provides amplifier bias current (IABC) to the three amplifiers via terminal 1. Lower limit and upper limit reference voltages are selected by appro- priate adjustment of potentiometers R1 and R2, respectively. When resistors R3 and R4 are equal in value (as shown), the intermediate limit reference voltage is automatically estab- lished at a value midway between the lower limit and upper limit values. Appropriate variation of resistors R3 and R4 per- mits selection of other values of intermediate limit voltage. Input signal (ES) is applied to the three comparators via termi- nals 5, 12 and 14. The “SET” output lines trigger the appropri- ate flip-flop whenever the input signal reaches a limit value. When the input signal returns to an intermediate value, the common flip-flop “RESET” line is energized. The loads in the circuits, shown in Figure 22 are 5V, 25mA lamps. Active Filters - Using the CA3060 as a Gyrator The high output impedance of the OTAs makes the CA3060 ideally suited for use as a gyrator in active filter applications. Figure 24 shows two OTAs of the CA3060 connected as a gyrator in an active filter circuit. The OTAs in this circuit can make a 3 µF capacitor function as a floating 10kH inductor across Terminals A and B. The measured Q of 13 (at a frequency of 1Hz) of this inductor compares favorably with a calculated Q of 16. The 20k Ω to 2MΩ attenuators in this circuit extend the dynamic range of the OTA by a factor of 100. The 100k Ω potentiometer, across V+ and V-, tunes the inductor by varying the g21 of the OTAs, thereby changing the gyration resistance. Three Channel Multiplexer Figure 25 shows a schematic of a three channel multiplexer using a single CA3060 and a 3N153 MOSFET as a buffer and power amplifier. When the CA3060 is connected as a high input impedance voltage follower, and strobe “ON”, each amplifier is activated and the output swings to the level of the input of the amplifier. The cascade arrangement of each CA3060 amplifier with the MOSFET provides an open loop voltage gain in excess of 100dB, thus assuring excellent accuracy in the voltage follower mode with 100% feedback. Operation at ±6V is also possible with several minor changes. First, the resistance in series with the amplifier bias current (IABC) ter- minal of each amplifier should be decreased to maintain 100 µA of strobe “ON” current at this lower supply voltage. Second, the drain resistance for the MOSFET should be CA3060 TRI-LEVEL DETECTOR CA3086 FLIP-FLOP CA3086 FLIP-FLOP SET RESET SET V+ V+ POSITIVE OUTPUT (WHEN UPPER UPPER LIMIT REFERENCE VOLTAGE INTERMEDIATE LIMIT REFER- ENCE VOLTAGE INPUT SIGNAL LIMIT IS REACHED) POSITIVE OUTPUT (WHEN LOWER LIMIT IS REACHED) LOWER LIMIT REFERENCE VOLTAGE V+ V- - + - + - + FIGURE 23. FUNCTIONAL BLOCK DIAGRAM OF A TRI-LEVEL COMPARATOR AMP 1 3 V+ = 6V AMP 2 15 8 V- = -6V 10 100k Ω V+ V- 560k Ω 560k Ω 12 9 11 16 14 20 3 µF 2M Ω 13 20k Ω 20k Ω TERMINAL A 2M Ω L = 10kH TERMINAL B k Ω 20 k Ω FIGURE 24. TWO OPERATIONAL TRANSCONDUCTANCE AMPLIFIERS OF THE CA3060 CONNECTED AS A GYRATOR IN AN ACTIVE FILTER CIRCUIT - + 3 4 5 2k Ω 2k Ω V+ = 15V 0.01 µF 7 8 6 300k Ω STROBE V- = -15V - + 2k Ω 2k Ω 9 300k Ω STROBE 12 11 10 - + 2k Ω 2k Ω 300k Ω STROBE 13 14 15 16 3 390 Ω 0.001 µF 4 2 V+ = 15V 0.02 µF OUTPUT 3N153 V- = -15V +15V -15V STROBE “ON” STROBE “OFF” 3k Ω FIGURE 25. THREE CHANNEL MULTIPLEXER CA3060 |
Número de pieza similar - CA3060E |
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Descripción similar - CA3060E |
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