LC72121-D-E

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LC72121-D-E is a high-performance clock generator, PLL, and frequency synthesizer integrated circuit (IC). It operates from a single 2.7–5.5V supply and is designed to generate various and highly stable frequencies from 0.8Hz to 33MHz with a high resolution. The LC72121-D-E supports up to seven output clocks with frequencies ranging from 8kHz to 33MHz, eliminating the need for multiple components. This makes it ideal for use in both time-critical, low-power applications and clock isolation in portable electronic devices. The LC72121-D-E offers multiple on-chip features such as low-noise frequency synthesizers, high-speed clock synthesizers, multiple-clock outputs, DAC control, and a holdover section, making it suitable for a variety of applications.

The primary application of the LC72121-D-E is in the field of clock and timing applications, where it is used to synthesize multiple clock and timing signals with high precision and accuracy. Its frequency synthesis capability includes a wide range of frequencies, and it can be used to generate stable and accurate frequency outputs. Its multiple-clock outputs and onboard DAC control enable advanced clock configuration and help reduce external components. It can also simultaneously synthesize clocks with different frequencies, which is useful in applications that require synchronized clocks. Furthermore, its multiple-clock outputs can reduce EMI, as well as improve stability.

The LC72121-D-E utilizes a Phase Locked Loop (PLL) architecture for frequency synthesis. It consists of a Voltage-Controlled Oscillator (VCO), a Phase Comparator (PC), and a Frequency Divider (FD) that together form a closed loop. The VCO is used to generate an output frequency, which is compared with an external reference frequency by the PC. The output from the PC is then fed into the FD, and the feedback output of the FD is fed back to the PC to adjust the output frequency to match the reference frequency. This ensures that the synthesized frequency is accurate and stable. Furthermore, the LC72121-D-E can be configured to generate up to seven different frequencies in a synchronous manner. This is achieved by connecting the output of the FD to multiple PLLs, each operating at different frequencies.

The LC72121-D-E also incorporates a Holdover function, which maintains a stable output frequency during an interruption in the reference signal. This feature is particularly useful for applications such as clock synchronization, where it can provide a stable reference frequency for several milliseconds. Additionally, the LC72121-D-E supports an additional on-chip DAC, which can be used to precisely adjust the output waveform over a wide range. This is useful for applications such as clock skew or duty cycle adjustment, where precise control over the waveform is important.

In conclusion, the LC72121-D-E is a highly integrated clock generator, PLL, and frequency synthesizer IC. It is designed for use in a wide range of timing and clock applications, such as clock synchronization, frequency synthesis, and clock isolation. Its multiple-clock outputs, DAC control, and holdover section make it an excellent choice for advanced clock applications. Moreover, its frequency synthesis capability offers a wide range of frequencies, low jitter, and precise frequency control. For these reasons, the LC72121-D-E is an ideal solution for a variety of clock and timing applications.

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