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LMC6494BEMX Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LMC6494BEMX Datasheet(HTML) 11 Page - National Semiconductor (TI) |
11 / 18 page Typical Performance Characteristics V S = +15V, Single Supply, TA = 25˚C unless otherwise specified (Continued) Application Notes Input Common-Mode Voltage Range Unlike Bi-FET amplifier designs, the LMC6492/4 does not exhibit phase inversion when an input voltage exceeds the negative supply voltage. Figure 1 shows an input voltage ex- ceeding both supplies with no resulting phase inversion on the output. The absolute maximum input voltage is 300 mV beyond ei- ther supply rail at room temperature. Voltages greatly ex- ceeding this absolute maximum rating, as in Figure 2, can cause excessive current to flow in or out of the input pins possibly affecting reliability. Applications that exceed this rating must externally limit the maximum input current to ±5 mA with an input resistor (R I) as shown in Figure 3. Stability vs Capacitive Load DS012049-73 Stability vs Capacitive Load DS012049-74 Stability vs Capacitive Load DS012049-75 Stability vs Capacitive Load DS012049-76 DS012049-8 FIGURE 1. An Input Voltage Signal Exceeds the LMC6492/4 Power Supply Voltages with No Output Phase Inversion DS012049-9 FIGURE 2. A ±7.5V Input Signal Greatly Exceeds the 5V Supply in Figure 3 Causing No Phase Inversion Due to R I www.national.com 11 |
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