8N4SV76LC-0177CDI

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Clock/Timing technology is involved in numerous aspects of modern life and industry. This includes the use of Programmable timers and oscillators. 8N4SV76LC-0177CDI is a prime example of this technology. Its application fields, as well as its working principle, are discussed in this article.

Application Field

The 8N4SV76LC-0177CDI is a programmable clock generator designed for use in communication applications. These can include but are not limited to GSM, EDGE, WCDMA and CDMA2000 systems. The key features are the selection of two outputs, a 5.0V LVCMOS differential output and an HCMOS single output, as well as the multiple selectable output frequencies. These can range from 128MHz to 250MHz. This makes the 8N4SV76LC-0177CDI an ideal candidate for any application that requires a fixed high-frequency clock.

Working Principle

The 8N4SV76LC-0177CDI uses a differential LVCMOS circuit topology combined with advanced design to provide high reliability and stability while maintaining low power consumption and low jitter. This integrated circuit consists of a quartz crystal oscillator, a charge-pump loop, a band-pass filter, and a high-performance PLL circuit. This synthesizes a low-jitter, high-power differential LVCMOS output clock signal.

The quartz crystal oscillator provides frequency accuracy with low temperature coefficients and is enabled by an active low-noise charge-pump loop. The band-pass filter further reduces the low-frequency noise of the oscillator. The PLL circuit then stabilizes the output. For most applications, the output jitter is under 2 ps RMS, or 8.8 ps peak-to-peak.

Conclusion

The 8N4SV76LC-0177CDI is a programmable clock generator ideal for communication applications. It incorporates a quartz crystal oscillator with a low-noise charge-pump loop, a band-pass filter and a high-performance PLL circuit for its operation. This integrated circuit is capable of producing a low-jitter differential LVCMOS output with frequencies ranging from 128MHz to 250MHz, making it an attractive solution for high-frequency clock applications. It is an excellent example of the programmable timers and oscillators technology.

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