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LMC6584BIM Datasheet(PDF) 10 Page - National Semiconductor (TI) |
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LMC6584BIM Datasheet(HTML) 10 Page - National Semiconductor (TI) |
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10 / 19 page  Typical Performance Characteristics V S+ = 3V, Single Supply, TA = 25˚C unless otherwise specified. (Continued) Application Information 1.0 Input Common-Mode Voltage Range The LMC6582/4 has a rail-to-rail input common-mode volt- age range. Figure 1 shows an input voltage exceeding both supplies with no resulting phase inversion on the output. The absolute maximum input voltage at V + = 3V is 300 mV beyond either supply rail at room temperature. Voltages greatly exceeding this absolute maximum rating, as in Figure 2, can cause excessive current to flow in or out of the input pins, possibly affecting reliability. The input current can be externally limited to ±5 mA, with an input resistor, as shown in Figure 3. 2.0 Rail-to-Rail Output The approximated output resistance of the LMC6582 is 50 Ω sourcing, and 50 Ω sinking at V S = 3V. The maximum output swing can be estimated as a function of load using the calcu- lated output resistance. 3.0 Low Voltage Operation The LMC6582/4 operates at supply voltages of 2.2V and 1.8V. These voltages represent the End of Discharge volt- ages of several popular batteries. The amplifier can operate from 1 Lead-Acid or Lithium Ion battery, or 2NiMH, NiCd, or Carbon-Zinc batteries. Nominal and End of Discharge of Voltage of several batteries are listed below. Stability vs Capacitive Load DS012041-53 Stability vs Capacitive Load DS012041-54 Stability vs Capacitive Load DS012041-55 DS012041-3 FIGURE 1. An Input Signal Exceeds the LMC6582 Power Supply Voltages with No Output Phase Inversion DS012041-4 FIGURE 2. A ±7.5V Input Signal Greatly Exceeds the 3V Supply, Causing No Phase Inversion Due to R I DS012041-5 FIGURE 3. Input Current Protection for Voltages Exceeding the Supply Voltage www.national.com 10 |
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