CGS3319MX

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CGS3319MX Application Field and Working Principle

• Introduction

CGS3319MX is a Clock Generator/Phase Locked Loop (PLL) Frequency Synthesizer manufactured by Texas Instruments. It offers very high frequency accuracy and stability to applications requiring clock and data synchronization. CGS3319 MX employs a low jitter PLL as the main control element to produce an accurate clock signal from a stable clock source. It can be used in any application where frequency sources must be kept in perfect synchronization, such as telecommunications and test instrumentation systems. It is specially designed for use in high speed Ethernet, Optical Ethernet and Gigabit systems.

• Features

CGS3319MX is a highly integrated PLL Frequency Synthesizer that is designed to provide a very high frequency accuracy and stability. It features several operating modes including “Master Output”, “Clock Multiplier”, and “Dual Output” modes. The “Master Output” mode provides a frequency-locked output based on a reference clock, while the “Clock Multiplier” mode enables output frequencies up to 8 times that of the reference clock. The “Dual Output” mode permits the simultaneous operation of two output clocks at different frequency ratios.

Furthermore, CGS3319MX includes several advanced features such as temperature compensation, phase change compensation and impulse noise reduction. It also includes a “Lock Detect” output which allows the user to monitor the PLL’s lock status. The device also incorporates a VCO Disable feature for power-saving during standby modes.

• Applications

CGS3319MX can be used in a variety of applications where high frequency accuracy and stability is required, such as:

• High speed Ethernet, Optical Ethernet, and Gigabit systems
• Telecommunications systems
• Test instrumentation
• Timekeeping circuits
• Phase-Locked Loop systems
• Frequency synthesizers

• Working Principle

CGS3319MX is based on a PLL (Phase Locked Loop). A PLL is a control system that can maintain a relatively fixed reference frequency in the presence of severe disturbances or variations in the source clock. The basic PLL circuit has three components: an input, a variable frequency oscillator (VFO), and a phase detector. The VFO is driven from an external reference clock, which is then compared with a feedback input to the phase detector. The phase detector then compares the phase difference between the input and the feedback and produces an output that is proportional to the difference. This output is then used to adjust the VFO frequency so as to minimize the difference and hence maintain a stable reference frequency.

In CGS3319MX, the VFO is a standard Voltage-controlled Oscillator (VCO) whose frequency is determined by the control voltage applied to it. The phase detector is a dual-modulus prescaler, which divides the reference clock frequency by a programmable divider ratio. The output of the phase-detector is then filtered and used to drive the VCO. This is a feedback loop, which maintains the reference frequency to a fixed value.

The output frequency of CGS3319MX is determined by two main factors: the reference clock frequency and the VCO control voltage. The reference clock frequency is determined by an external source and is used as the reference frequency for the VCO. The VCO is controlled by the voltage applied to it, which is determined by the phase difference between the reference and the feedback signals. CGS3319MX has two main modes of operation, the “Master Output” mode, where the reference frequency is used as the output frequency, and the “Clock Multiplier” mode, where the reference frequency is multiplied by a programmable divider ratio to produce the output frequency.

• Conclusion

In conclusion, CGS3319MX is a highly integrated PLL Frequency Synthesizer designed to provide high frequency accuracy and stability. It can be used in a variety of applications requiring clock synchronization, such as high speed Ethernet, Optical Ethernet and Gigabit systems. It employs a low jitter PLL and an advanced feature set that includes temperature compensation, phase change compensation and impulse noise reduction. CGS3319MX makes an ideal choice for applications where a reliable and stable clock source is needed.

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