CY22391LTXC-07

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CY22391LTXC-07 is a versatile clock frequency synthesizer developed by Cypress Semiconductor. It is capable of generating 2 frequency outputs and is ideal for applications such as digital television, mobile phone, clock/ timing, etc. The CY22391LTXC-07 is integrated with programmable frequency range through the simple, single-chip device. It supports extremely wide range of frequency outputs from 4kHz to 125MHz.

Features

• Fully integrated frequency synthesizer with two analog outputs
• Programmable frequency range from 4kHz to 125MHz
• Output frequency dividers (1 to 64) for each output
• Programmable output duty-cycle (50% to 90%)
• Programmable output frequency accuracy of less than 1% of target frequency
• I2C controllable
• High voltage output

Applications

Due to its strong performance and wide range of frequency outputs, CY22391LTXC-07 is suitable for a variety of applications, including digital television, mobile phones, home audio/video systems, personal computers, peripherals and clock/timing applications. It can be utilized to generate stable clock signal to drive digital signal processing components and graphics cards requiring high frequency accuracy and precise synchronism. In addition, its programmable output will give users flexibility in generating precise clock signal with various dividers.

Working Principle

The CY22391LTXC-07 is an integrated frequency synthesizer that utilizes phase-locked loop (PLL) to achieve its desired performance. It consists of two main building blocks: a high speed Voltage Controlled Oscillator (VCO) and a phase-frequency detector (PFD). The VCO is the circuit that generates a sawtooth waveform of desired frequency and the PFD is used to compare the frequencies of the input reference (REF) and the output of the VCO, using this comparison the PFD de-tunes the VCO frequency accordingly.

The input reference is then fed in to the input of the phase-frequency detector, which then compares the phase and frequency difference between the reference clock and the output of the VCO. If the frequency difference is 0, that means the VCO is producing an output with the exact same frequency as the reference clock and the PLL is locked. Otherwise, the output frequency from the VCO is de-tuned to match the reference clock.

The CY22391LTXC-07 features programmable dividers which can be used to generate different outputs with different duty cycle. The dividers allow the input frequency to be divided down to generate a slower frequency thus allowing users to adjust the duty cycle of the output. By adjusting the duty cycle, users can easily adjust the performance of the system to match their desired frequency.

Conclusion

The CY22391LTXC-07 is a versatile clock frequency synthesizer developed by Cypress Semiconductor designed for digital television, mobile phone, clock/timing, etc. It supports extremely wide range of frequency outputs from 4kHz to 125MHz as well as programmable output duty-cycle with high frequency accuracy of less than 1% of target frequency. The CY22391LTXC-07 utilizes phase-locked loop (PLL) to achieve desired performance, with programmable dividers to generate multiple outputs with various duty-cycle. It is ideal for applications requiring precise frequency synchronism and accuracy.

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