CDCE421RGERG4

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Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

Introduction:

The CDCE421RGERG4 is a low-cost, low-power, programmable frequency synthesizer for wireless systems. It offers an accurate and flexible solution for a wide range of frequency synthesizer applications. The CDCE421RGERG4 includes an on-chip crystal oscillator and can be programmed to produce square-wave, pulse-width modulated, or sine-wave outputs. It supports a wide bandwidth of frequencies from 500 MHz to 1.5 GHz.

Features:

The CDCE421RGERG4 is designed to meet the requirements of low cost and low power in high frequency applications. It features a wide range of programmable features such as frequency matching, jitter suppression, slew rate control and output power control. Additionally, the on-chip crystal oscillator eliminates the need for external oscillators. The device supports a wide bandwidth of frequencies from 500 MHz to 1.5 GHz and supports multiple levels of modulation, including fractional-N and direct digital synthesis, to improve signal quality.

Application Field:

The CDCE421RGERG4 is ideal for applications requiring low cost and low power in high frequency applications. These applications include digital TV, cellular base station, short-range wireless systems and cable modems. It is also suitable for frequency synthesizers in medical, avionic, and instrumentation applications.

Working Principle:

The CDCE421RGERG4 frequency synthesizer is based on a phase-locked loop (PLL) architecture. The PLL is used to generate a very precise signal with a center frequency that is determined by a reference clock source and a programmed integer or fractional-N phase-locked loop divider. The phase frequency detector (PFD) senses the phase difference between the output of the fractional divider and the reference clock source, and then corrects the phase difference, resulting in a very stable frequency. The on-chip crystal oscillator provides a reference frequency for the loop and is used as the input to the PFD to ensure high accuracy and stability. The output of the PLL is then fed to the output buffer, which amplifies the signal and provides the output frequency.

Conclusion:

The CDCE421RGERG4 is a low-cost, low-power frequency synthesizer suitable for a wide range of frequency synthesizer applications. It features a wide range of programmable features, including frequency matching, jitter suppression, slew rate control and output power control. The on-chip crystal oscillator eliminates the need for external oscillators and ensures that the device is highly accurate and stable over a wide range of frequencies. The CDCE421RGERG4 is ideal for applications such as digital TV, cellular base station, short-range wireless systems, and cable modems.

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