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CA3140 Datasheet(PDF) 17 Page - Intersil Corporation |
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CA3140 Datasheet(HTML) 17 Page - Intersil Corporation |
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17 / 23 page  17 FN957.10 July 11, 2005 Pulse “droop” during the hold interval is 170pA/200pF which is 0.85 µV/µs; (i.e., 170pA/200pF). In this case, 170pA represents the typical leakage current of the CA3080A when strobed off. If C1 were increased to 2000pF, the “hold-droop” rate will decrease to 0.085 µV/µs, but the slew rate would decrease to 0.25V/ µs. The parallel diode network connected between Terminal 3 of the CA3080A and Terminal 6 of the CA3140 prevents large input signal feedthrough across the input terminals of the CA3080A to the 200pF storage capacitor when the CA3080A is strobed off. Figure 24 shows dynamic characteristic waveforms of this sample-and-hold system. Current Amplifier The low input terminal current needed to drive the CA3140 makes it ideal for use in current amplifier applications such as the one shown in Figure 25 (see Note 14). In this circuit, low current is supplied at the input potential as the power supply to load resistor RL. This load current is increased by the multiplication factor R2/R1, when the load current is monitored by the power supply meter M. Thus, if the load current is 100nA, with values shown, the load current presented to the supply will be 100 µA; a much easier current to measure in many systems. Note that the input and output voltages are transferred at the same potential and only the output current is multiplied by the scale factor. The dotted components show a method of decoupling the circuit from the effects of high output load capacitance and the potential oscillation in this situation. Essentially, the necessary high frequency feedback is provided by the capacitor with the dotted series resistor providing load decoupling. Full Wave Rectifier Figure 26 shows a single supply, absolute value, ideal full- wave rectifier with associated waveforms. During positive excursions, the input signal is fed through the feedback network directly to the output. Simultaneously, the positive excursion of the input signal also drives the output terminal (No. 6) of the inverting amplifier in a negative going excursion such that the 1N914 diode effectively disconnects the amplifier from the signal path. During a negative going excursion of the input signal, the CA3140 functions as a normal inverting amplifier with a gain equal to -R2/R1. When the equality of the two equations shown in Figure 26 is satisfied, the full wave output is symmetrical. NOTE: 14. “Operational Amplifiers Design and Applications”, J. G. Graeme, McGraw-Hill Book Company, page 308, “Negative Immittance Converter Circuits”. Top Trace: Output; 50mV/Div., 200ns/Div. Bottom Trace: Input; 50mV/Div., 200ns/Div. Top Trace: Output Signal; 5V/Div, 2 µs/Div. Center Trace: Difference of Input and Output Signals through Tektronix Amplifier 7A13; 5mV/Div., 2 µs/Div. Bottom Trace: Input Signal; 5V/Div., 2 µs/Div. LARGE SIGNAL RESPONSE AND SETTLING TIME SAMPLING RESPONSE Top Trace: Output; 100mV/Div., 500ns/Div. Bottom Trace: Input; 20V/Div., 500ns/Div. FIGURE 24. SAMPLE AND HOLD SYSTEM DYNAMIC CHARACTERISTICS WAVEFORMS +15V 2 1 100k Ω 0.1 µF -15V 4 5 7 + CA3140 - 0.1 µF 4.3k Ω 10k Ω 6 3 R1 POWER SUPPLY 10M Ω R2 IL R2 R1 M RL IL x FIGURE 25. BASIC CURRENT AMPLIFIER FOR LOW CURRENT MEASUREMENT SYSTEMS CA3140, CA3140A |
Similar Part No. - CA3140_05 |
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Similar Description - CA3140_05 |
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