LMC660CN

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LMC660CN Application Field and Working Principle

The LMC660CN is an internally compensated low-power CMOS operational amplifier that is characterized by low power consumption, wide power-supply range, common-mode input voltage range extending to ground/VDD, and rail-to-rail output swing. It has a high-impedance input buffer, and can be connected as a half-power voltage follower for higher bandwidths than a full-power rail-to-rail operational amplifier.

Application Field

The LMC660CN has been designed for a wide range of applications. It is ideal for use in controlling, conditioning, and amplifying signals in instrumentation, portable and cost-sensitive systems. This low-power device can also be used to replace rail-to-rail op-amps in traditional applications, providing improved power consumption and the ability to support lower supply voltages. For example, it is used in audio circuits and medical instrumentation systems, as well as data acquisition systems, digital potentiometers, voltage buffers and active filters.

Working Principle

The LMC660CN consists of a high input impedance buffer, a unity-gain cell, and a unity-gain output buffer. The internal compensation network provides stability over the full recommended power supply range and bandwidth while consuming only a few micro-amps of quiescent current. The buffer amplifiers provide a high input impedance, low input bias current, and rail-to-rail output swing to rail-to-rail inputs scaling. The rail-to-rail output buffers provide both a low-power supply-noise rejection and high-impedance output.

The unity-gain cell of the LMC660CN consists of two differential stages plus two complementary bipolar transistors in the complementary-symmetry, cascode configuration. The voltage gain of the unity-gain cell is determined by the multiplication of the two differential stages and two BJT stages. The transconductance of the unity-gain cell is determined by the multiplication of the two differential stages, two BJT stages and the transconductance of the unity-gain buffer.

The high-impedance buffer of the LMC660CN is used to isolate the input signal from the unity-gain cell so as to reduce the loading of the precision instrumentation circuit. The buffer also reduces the loading of the input device and increases the input impedance. It also provides rail-to-rail voltage swing at the output. The unity-gain buffer is used to provide some gain, as well as provide a high output impedance and its low output current.

Conclusion

The LMC660CN is an internally compensated low-power CMOS operational amplifier that is widely used for a variety of applications including cost-sensitive instrumentation systems, portable audio circuits, data acquisition systems, digital potentiometers and active filters. It features low power consumption, wide power-supply range, common-mode input voltage range extending to ground/VDD, and rail-to-rail output swing. The device consists of a high input impedance buffer, a unity-gain cell, and a unity-gain output buffer so as to reduce loading of the input device and increase the input impedance.

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