CDCV857AGQLR

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The CDCV857AGQLR is a low cost Frequency Synthesizer that is capable of outputting frequencies from greater than 500kHz up to 10MHz. It is suitable for applications such as generating baseband sampling frequencies for signal analysis, signal synthesizers and frequency conversion. The CDCV857AGQLR is a frequency synthesizer that uses a phase locked loop (PLL) to generate a precise clock frequency with low frequency jitter.

The CDCV857AGQLR is a high performance Frequency Synthesizer that provides excellent phase noise and spurs performance. It is designed for precise synchronization, controlling and phase noise jitter and frequency drift reduction. The PLL loop on the CDCV857AGQLR uses the phase locked loop principle which is a feedback system to maintain a precise frequency. The PLL loop is composed of a Voltage controlled oscillator, a comparison circuit, a low pass filter and a divider.

The Voltage Controlled Oscillator (VCO) is the core element of the PLL. It is used to produce a stable oscillator signal with frequency that is determined by an external control voltage. The VCO frequency is the output frequency of the synthesizer that is divided down from the reference frequency. The reference frequency used is an input pad on the CDCV857AGQLR.

The comparison circuit is an exclusive logic circuit used to compare two signals and generate an error signal to control the VCO. The two signals used for comparison are the divided output of the reference frequency and the output from the VCO. The error signal generated is an indication of the difference between the two signals which is then applied back to the VCO to correct the output frequency.

The low pass filter is used to make sure the error signal is not affected by the high frequency components of the divided output. The output of the low pass filter is a DC voltage that is applied to the VCO to correctly adjust the oscillator frequency. The filter also has the ability to adjust the loop order of the PLL to increase or decrease the phase noise and spurs performance.

The divider is used to divide down the frequency of the output signal to the desired output frequency. The divider is adjustable and can be set to any one of a range of divider values to generate a precise output signal. The divider is also used for frequency hopping applications.

Overall, the CDCV857AGQLR is a low cost yet high performance Frequency Synthesizer that is capable of forming the foundation of a wide range of signal analysis and frequency conversion applications. The PLL loop is composed of the Voltage Controlled Oscillator, the comparison circuit, the low pass filter, and the divider, providing precise frequency control and low frequency jitter performance.

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