ADF4002BCPZ-RL7 Integrated Circuits (ICs)

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A clock generator or clock synthesizer is an electronic circuit designed to create a stream of pulses of a given frequency. ADF4002BCPZ-RL7 stands out among other clock generators due to its ability to generate clock signals with a wide range of frequencies and wide bandwidth – 64-400 MHz. Moreover, thanks to the embedded low-noise PLL, the device features low-jitter and low-spurious clock outputs for a wide range of application areas.

Features

• Frequency range from 64 to 400 MHz
• Low-noise PLL
• Outputs clock signal with wide bandwidth
• Low jitter and low spurious clock

Applications

ADF4002BCPZ-RL7 has a wide range of application areas, mainly due to its frequency range that is extended to 400 MHz and due to its ability to generate low-jitter and low-spurious clock outputs:

• Timing applications, such as time counters, USB controllers and Telecom base station systems.
• High-speed backplanes such as SONET/SDH, Ethernet and Fiber Channel.
• Graphics cards.
• Data acquisition systems.
• Wireless applications, such as WiFi and Bluetooth.
• Test and measurement.

Working Principle

ADF4002BCPZ-RL7 is a low-noise PLL-based clock generator that works on a 3-wire serial I2C/SMBus control interface for frequency programming. The device consists of the following three main sections: a low-noise voltage-controlled oscillator (VCO) with amplifiers and dividers configured to generate desired frequencies, a phase-frequency detector, and a PLL loop filter and divider network.

The PLL loop filter is a low-pass filter with a time constant defined by R1 and C1. It is used to limit the speed of the frequency change of the VCO output. The PLL loop filter also determines the overall loop stability, which is achieved by appropriate tuning of R1, C1 and C3.

The PLL loop also includes a low-noise amplifier. This amplifier is used to drive the 3-input OR gate, which is the input to the divide-by-N divider. The divider is used to multiply the PLL output by a factor of N to get the desired output frequency.

Conclusion

ADF4002BCPZ-RL7 is a high-performance clock generator with a broad frequency range, low-noise features, low jitter and low spurious clock outputs as well as a 3-wire serial I2C/SMBus control interface. Its wide range of features makes it suitable for a wide range of application areas such as timing applications, graphics cards and data acquisition systems.

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