LMC6492 Datasheet, PDF (11/18 Pages) National Semiconductor (TI) – CMOS Rail-to-Rail Input and Output Operational Amplifier

Typical Performance Characteristics V_S = +15V, Single Supply, T_A = 25˚C unless otherwise
specified (Continued)
Stability vs
Capacitive Load
Stability vs
Capacitive Load
Stability vs
Capacitive Load
Stability vs
Capacitive Load
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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.
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.
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FIGURE 1. An Input Voltage Signal Exceeds the
LMC6492/4 Power Supply Voltages with
No Output Phase Inversion
The absolute maximum input voltage is 300 mV beyond ei-
ther supply rail at room temperature. Voltages greatly ex-
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FIGURE 2. A ±7.5V Input Signal Greatly
Exceeds the 5V Supply in Figure 3 Causing
No Phase Inversion Due to R_I
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.
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