At supply voltages of 2.7V, 5V and 15V, the LMC6762 has an input common-mode voltage range which exceeds both supplies. As in the case of operational amplifiers, CMVR is defined by the V_OS shift of the comparator over the common-mode range of the device. A CMRR (ΔV_OS/ΔV_CM) of 75dB (typical) implies a shift of < 1mV over the entire common-mode range of the device. The absolute maximum input voltage at V⁺ = 5V is 200mV beyond either supply rail at room temperature.

Figure 11-1 An Input Signal Exceeds the LMC6762 Power Supply Voltages with No Output Phase Inversion

A wide input voltage range means that the comparator can be used to sense signals close to ground and also to the power supplies. This is an extremely useful feature in power supply monitoring circuits.

An input common-mode voltage range that exceeds the supplies, 20fA input currents (typical), and a high input impedance makes the LMC6762 ideal for sensor applications. The LMC6762 can directly interface to sensors without the use of amplifiers or bias circuits. In circuits with sensors which produce outputs in the tens to hundreds of millivolts, the LMC6762 can compare the sensor signal with an appropriately small reference voltage. This reference voltage can be close to ground or the positive supply rail.