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CA3160 Datasheet(PDF) 8 Page - Intersil Corporation |
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CA3160 Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 18 page 8 Typical Applications Voltage Followers Operational amplifiers with very high input resistances, like the CA3160, are particularly suited to service as voltage followers. Figure 3 shows the circuit of a classical voltage follower, together with pertinent waveforms using the CA3160 in a split-supply configuration. A voltage follower, operated from a single supply, is shown in Figure 4 together with related waveforms. This follower circuit is linear over a wide dynamic range, as illustrated by the reproduction of the output waveform in Figure 4B with input- signal ramping. The waveforms in Figure 4C show that the follower does not lose its input-to-output phase-sense, even though the input is being swung 7.5V below ground potential. This unique characteristic is an important attribute in both operational amplifier and comparator applications. Figure 4C also shows the manner in which the COS/MOS output stage permits the output signal to swing down to the negative supply-rail potential (i.e., ground in the case shown). The digital-to-analog converter (DAC) circuit, described in the following section, illustrates the practical use of the CA3160 in a single supply voltage follower application. 9-Bit CMOS DAC A typical circuit of a 9-bit Digital-to-Analog Converter (DAC) (see Note 6) is shown in Figure 5. This system combines the concepts of multiple-switch CMOS lCs, a low-cost ladder network of discrete metal-oxide-film resistors, a CA3160 op amp connected as a follower, and an inexpensive monolithic regulator in a simple single power-supply arrangement. An additional feature of the DAC is that it is readily interfaced with CMOS input logic, e.g., 10V logic levels are used in the circuit of Figure 5. The circuit uses an R/2R voltage-ladder network, with the output- potential obtained directly by terminating the ladder arms at either the positive or the negative power supply terminal. Each CD4007A contains three inverters, each inverter functioning as a single-pole double-throw switch to terminate an arm of the R/2R network at either the positive or negative power-supply terminal. The resistor ladder is an assembly of 1% tolerance metal-oxide film resistors. The five arms requiring the highest accuracy are assembled with series and parallel combinations of 806,000 Ω resistors from the same manufacturing lot. A single 15V supply provides a positive bus for the CA3160 follower amplifier and feeds the CA3085 voltage regulator. A “scale-adjust” function is provided by the regulator output control, set to a nominal 10V level in this system. The line-voltage regulation (approximately 0.2%) permits a 9-bit accuracy to be maintained with variations of several volts in the supply. The flexibility afforded by the CMOS building blocks simplifies the design of DAC systems tailored to particular needs. NOTE: 6. “Digital-to-Analog Conversion Using the Intersil CD4007A COS/MOS lC”, Application Note AN6080. FIGURE 4A. FIGURE 4B. OUTPUT WAVEFORM WITH GROUND REFERENCE SINE WAVE INPUT FIGURE 4C. OUTPUT SIGNAL WITH INPUT SIGNAL RAMPING FIGURE 4. SINGLE SUPPLY VOLTAGE FOLLOWER WITH ASSOCIATED WAVEFORMS. (E.G., FOR USE IN SINGLE SUPPLY D/A CONVERTER; SEE FIGURE 9 IN AN6080) CA3160 6 7 3 4 2 +15V 0.01 µF 10k Ω + - 0.1 µF BW (-3dB) = 4MHz SR = 10V/ µs 1 5 2k Ω OFFSET ADJUST Top Trace: Output Bottom Trace: Input CA3160 |
Número de pieza similar - CA3160_04 |
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Descripción similar - CA3160_04 |
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