LC72122V-TLM-E

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LC72122V-TLM-E Application Field & Working Principle

The LC72122V-TLM-E from ON Semiconductor is a Low Voltage, Low Power CMOS Clock Generator, providing an easy way for generation of an accurate clock signal which is used in low voltage, low power applications. It incorporates multiple features such as programmable clock speed, programmable output voltage and over/under voltage detection. The LC72122V-TLM-E also provides redundancy in terms of multiple clock inputs and flexibility in terms of its output configurations.

Features of the LC72122V-TLM-E

The LC72122V-TLM-E from ON Semiconductor offers the following features:

• Power Supply: 1.4 V to 3.6 V
• Phase Lock Loop (PLL): Programmable Input Clock Frequency up to 150 MHz (1 MHz resolution)
• Controller: Multiple inputs, programmable voltage and clock outputs.
• Outputs: Multiple clock signals ranging from 1 MHz to 125 MHz.
• Over/Under Voltage Detection: Accurate detection of over/undervoltage in the outputs.
• External Lock Detection: Able to detect when external clocks are locked, providing redundancy in terms of clock sources.

Applications of the LC72122V-TLM-E

The LC72122V-TLM-E from ON Semiconductor is used in a wide range of applications due to its various features. It can be used as a low voltage clock generator for most consumer applications such as cell phones, PDAs, laptop/tablet PCs, digital home appliances and automotive applications. Additionally, its PLL features are ideal for data communications, WLAN and storage applications where high accuracy and low power consumption are necessary. It can also be used as a clock source for mobile nodes in mobile ad-hoc networks.

Working Principle of the LC72122V-TLM-E

The LC72122V-TLM-E works on the principle of phase lock loop (PLL) frequency synthesizer. In this process, the reference frequency is generated and compared with the output frequency. Any deviation between these two frequencies results in a voltage being generated i.e. the error control voltage. This voltage is used to adjust the frequency of the output signals, either increasing it or decreasing it. This process of adjusting the output frequency also known as locking and is carried out by an internal programmable loop filter.

The LC72122V-TLM-E also works on the principle of external clock detection, which helps in providing redundancy in terms of the clock sources. This detection is carried out by monitoring the PLL status pin when an external clock is connected. When this pin is low, it indicates that an external clock is connected, thus allowing the LC72122V-TLM-E to automatically switch to the external clock source.

Conclusion

The LC72122V-TLM-E from ON Semiconductor is a low voltage, low power CMOS clock generator that offers a wide range of features and applications. It is classified as a clock/timing device and its working principle is based on the phase lock loop (PLL) frequency synthesizer as well as external clock detection. This makes it ideal for a variety of consumer and mobile applications that require a low voltage and low power clock source.

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