SL28770ELI

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The SL28770ELI is a high-integration zero-delay clock solution designed with a compact size and low power consumption. This clock solution, produced by Spirent Communications, is classified into the Clock/Timing - Application Specific category due to its powerful features and specialized applications. In this article, we will analyse the application field and working principle of the SL28770ELI in detail.

Applications

The SL28770ELI is a highly integrated clock solution and it’s used in a broad range of applications, especially for those that require zero delay. Its major applications include:

• Network centers
• Wireless communications
• Automobiles
• Industrial control systems
• Medical electronics
• Telecommunication systems
• Broadcasting systems

The SL28770ELI can also be used in systems such as T1/E1, SONET/SDH, PCS (Personal Communications System), 10/100/1000 Base-T, and ATM. It is especially suitable for system designers with stringent power budget, size, or timing requirements. The SL28770ELI’s excellences make it suitable for various applications.

Working Principle

The SL28770ELI is designed with a spread spectrum clock (SSC) function. The SSC module is composed of a fractional N-division frequency synthesizer, a clock mapper, a spread spectrum frequency generator, and a dual-channel divider. The signal input from the oscillator is first processed by the fractional N-division frequency synthesizer. Then, the SSC module can generate a clock output with zero delay and adjustable frequency.

The output frequency is adjustable through changing the control word of the SSC module. The lowest adjustable frequency is determined by the input signal frequency. When the SSC module operates at a higher output frequency than the maximum value determined by the input signal frequency, the output signal will be divided by the clock mapper. The reference clock frequency decides the maximum output frequency and the range of the adjustable output frequency.

Furthermore, the frequency of the output signal is modulated by the spread spectrum frequency generator. The output frequency of this generator can be modulated by changing various parameters such as the spreading ratio and the spreading center frequency. Adjusting the frequency modulation of the output can help to meet the system requirements and reduce the EMI (Electro-Magnetic Interference).

The SL28770ELI can also be used as a signal transceiver. It can inversely transceiver signals from the transmitter side to the receiver side. The signal transceiver includes a transmitter core and receiver core. The signal from the transmitter is synchronized with the output of a clock synthesizer and then transmitted onto the signal bus. The clock synthesizer generates the local clock of the signal receiver.

Conclusion

The SL28770ELI is a high-integrated zero delay clock solution which is highly suited for fulfilling stringent power, size and timing requirements in a wide array of applications including network centers, wireless communications, automobiles, industrial control systems, medical electronics, telecommunication systems and broadcasting systems. It is designed with a spread spectrum clock function and a transceiver, which allows for adjustable frequency with zero delay and transmission of signals across the receiver and transmitter respectively.

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