AD9520-2BCPZ

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AD9520-2BCPZ is a single chip, differential clock generator and PLL device that is designed to generate, condition, and distribute common clock signals used in digital systems and communications equipment. It is designed to convert a single crystal reference clock into multiple clock outputs operating at any frequency and operating in any phase relationship.

Application field

The AD9520-2BCPZ is primarily used in the telecom industry, where it is used to generate multi-phase clock sources used to transmit and receive voice, data, and video signals. This frequency synthesizer is also used in wireless and satellite communication systems, including base stations, switches, transceivers, and modems. Additionally, this device is also typically found in computing and embedded applications, such as industrial controllers, PC motherboards, FPGAs, and other digital applications that require a combination of multiple clock outputs.

Working principle

The AD9520-2BCPZ chip is based on a "phase-locked loop" (PLL) architecture, which is a common method used to generate reliable and precise clock outputs. The chip contains two PLL stages, which are designed to allow the user to adjust different parameters, such as the frequency and phase relationships between the clock outputs, while still focusing on getting the best possible clock signal quality.

The first stage PLL includes a voltage controlled oscillator (VCO), an input reference clock, and a phase frequency detector which are used to generate a coherent clock. The VCO can generate a wide range of frequencies, depending on the reference clock frequency and the values of the on-chip capacitors. The second stage PLL performs the necessary corrections to the clock outputs to ensure clock accuracy and stability.

The chip also features on-chip power-on reset logic and on-chip termination resistors that allow for proper operation in noisy environments. Additionally, the AD9520-2BCPZ includes advanced programming logic, keeping the chip-to-chip data consistent. This allows the user to easily control the frequency, phase delays, and other important parameters.

Conclusion

The AD9520-2BCPZ is a highly flexible, single-chip solution for generating and distributing differntial clock signals. It is ideal for the telecom, wireless, computing, and digital control applications, due to its flexibility, accuracy and stability. This chip includes advanced programming capabilities and on-chip termination resistors that help to provide optimal performance in noisy environments.

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