CDC2536DBG4

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The CDC2536DBG4 clock generator is a low-jitter, low-noise, high-performance clock generator designed for telecom, networking, and broadcast applications. The device utilizes a programmable frequency synthesizer, a phase-locked loop (PLL), and a voltage controlled crystal oscillator (VCXO) to generate the desired clock output frequency. The output frequency is adjustable by a programmable divider and up to four different output frequencies can be programmed. The CDC2536DBG4 has two output clock selection pins, one for the primary or "output clock" frequency, and one for an optional second output clock of up to 1000 MHz.

The CDC2536DBG4 has two distinct working modes, the first is the PLL Mode, in which the device utilizes a programmable frequency synthesizer and VCXO to generate a clock output frequency. This mode is suitable for applications where the input frequency is variable and needs to be locked to a specific frequency. Apart from that, the application also requires a high stability over time and frequency. The second mode of operation is the VCO Mode, in which the device utilizes only the programmable frequency synthesizer to generate a clock output frequency. This mode is ideal for applications where the input frequency is constant and where a stable frequency is required over time.

In both operating modes, the frequency synthesizer is used to generate the desired output clock. The frequency synthesizer utilizes its programmable dividers and multiplexers to translate the reference frequency into the desired output frequency. The output clock frequency is adjusted using the adjustable divider, which can be programmed with a 16-bit value from 0-65535. The frequency synthesizer also has a “phase” pin which allows for fine tune adjustment of the output frequency. This pin can be used to obtain jitter-free operation.

The PLL of the CDC2536DBG4 has a wide loop bandwidth of 0.4 MHz to 15 MHz, which is well suited for applications that require fast locking and low jitter output clock. The device also has a fast lock time of just 2 μs, making it suitable for networking applications. The output jitter of the device is typically less than 1 psec, ensuring the best performance in high-speed and long-distance communication networks.

The VCXO of the CDC2536DBG4 also provides excellent frequency stability, allowing the output clock frequency to remain consistent over long distances. The device also has a low-noise silicon oscillator core, which ensures the best possible performance. Additionally, the VCO’s features are disabled when the primary clock is selected, providing a lower power alternative for applications that do not require VCO operation.

The CDC2536DBG4 offers an ideal solution for telecom, networking and broadcast applications that require high-performance, low-jitter, and low-noise clocks. Its adjustable output frequency and programmable dividers allow for easily adjustable frequency output, and its low noise, high stability VCO make it suitable for long-distance, high-speed communication networks. With its wide loop bandwidth and fast lock time, the device ensures fast and accurate clock generation, while its low jitter performance ensures maximum performance.

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