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CA3280AF3 Folha de dados(PDF) 5 Page - Intersil Corporation |
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CA3280AF3 Folha de dados(HTML) 5 Page - Intersil Corporation |
5 / 10 page 5 Application Information Figures 4 and 5 show the equivalent circuits for the current source and linearization diodes in the CA3280. The current through the linearization network is approximately equal to the programming current. There are several advantages to driving these diodes with a current source. First, only the offset current from the biasing network flows through the input resistor. Second, another input is provided to extend the gain control dynamic range. And third, the input is truly differential and can accept signals within the common mode range of the CA3280. Typical Applications The structure of the variable operational amplifier eliminates the need for matched resistor networks in differential to single ended converters, as shown in Figure 6. A matched resistor network requires ratio matching of 0.01% or trimming for 80dB of common-mode rejection. The CA3280, with its excellent common mode rejection ratio, is capable of converting a small ( ±25mV) differential input signal to a single-ended output without the need for a matched resistor network. Figure 7 shows the CA3280 in a typical gain control application. Gain control can be performed with the amplifier bias current (lABC). With no diode bias current, the gain is merely gMRL.For example, with an lABC of 1mA, the gM is approximately 16mS. With the CA3280 operating into a 5k Ω resistor, the gain is 80. The need for external buffers can be eliminated by the use of low value load resistors, but the resulting increase in the required amplifier bias current reduces the input impedance FIGURE 3A. EFFECTS OF DIODE LINEARIZATION, WITH DIODE PROGRAMMING TERMINAL ACTIVE FIGURE 3B. WITH DIODE PROGRAMMING TERMINAL CUTOFF FIGURE 3. CA3280 TRANSFER CHARACTERISTICS Test Circuits and Waveforms (Continued) 1/2 13 CA3280 1 14 4 3 15 16 15V IDIODE IABC -15V 1k Ω V+ 10k Ω 10k Ω V- IOUT VIN IABC = 650µA, ID = 200µA; Vertical = 200µA/Div.; Horizontal = 1V/Div. 1/2 12 CA3280 8 11 6 4 10 9 15V IDIODE IABC 1k Ω V+ 10k Ω 10k Ω -15V V- IOUT VIN IABC = 650µA; ID = 0; Vertical = 200µA/Div.; Horizontal = 25mV/Div. CA3280, CA3280A |
Nº de peça semelhante - CA3280AF3 |
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Descrição semelhante - CA3280AF3 |
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