LM4140CCM-4.1

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The LM4140CCM-4.1 is an integrated advantage voltage reference circuit that is specifically designed for precision low power applications. This product combines a unique combination of rail-to-rail biasing, resistor and capacitor feedback elements with an accurate, low power CMOS regulator to provide a system-ready voltage reference. The LM4140CCM-4.1 is designed to drive nominal output current requirement of up to 4mA and provide a ultra-low power consumption of typically 0.5μA.

Background of LM4140CCM-4.1

The company Texas Instruments first introduced the LM4140CCM-4.1 as part of its High Speed/Low Power Voltage Reference family of products. It is a precision voltage reference that is designed to simplify the design and production of power sensitive circuits by combining the advantages of bipolar and CMOS components into a single integrated monolithic device. This product was designed exclusively for applications where ultra-low power consumption is the priority, such as battery-powered portable applications and mobile communications systems.

Application Fields of LM4140CCM-4.1

The LM4140CCM-4.1 is mainly targeted for use in low power and precision voltage reference applications. It is used for circuitry where short circuit protection, low quiescent current, low power consumption and radiation hardness are essential. These applications include portable wireless systems requiring precision references during transmission, small signal conditioning circuitry, automotive systems, and medical instrumentation systems. The LM4140CCM-4.1 suits these systems as it can quickly close the system loop with an improved voltage accuracy and a greater output stability.

Working Principle of LM4140CCM-4.1

The white paper “TXN/TI-High Speed/Low Power Voltage Reference” provides an in-depth analysis of the LM4140CCM-4.1. In summary, it uses two differential amplifiers and an accurate reference current source in a standard Band-Gap reference topology to generate a precision voltage source. The amplifier stages are designed with rail-to-rail biasing, which permits a full rail-to-rail output swing and allows for the best performance from a wide variety of input signals. The resistor and capacitor feedback circuit are incorporated for better temperature stability and wideband performance. The voltage reference circuit is powered directly from the power supply and the quiescent current is typically very low at 0.5 μA.

Conclusion

The LM4140CCM-4.1 provides a high-speed and low-power integrated voltage reference. It combines all of the advantages of bipolar and CMOS components into a single monolithic device, and provides a typical quiescent current of only 0.5 μA. Its low power consumption and high power output make it well suited for precision voltage reference applications in portable wireless systems, medical instrumentation systems, automotive systems, and other small signal conditioning circuitry. The LM4140CCM-4.1 is an invaluable tool for designers who are looking to achieve high accuracy and performance with a low power design.

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