LMC6584AIM datasheet(10/19 Pages) NSC

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

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

DS012041-5

FIGURE 3. Input Current Protection for

Voltages Exceeding the Supply Voltage

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