CY2308SXI-1H

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The CY2308SXI-1H is a clock generator, phase locked loop (PLL) frequency synthesizer that integrates a low-noise VCO, prescaler, reference and loop filters, loop amplifier, and PLL logic in one package. It is designed to generate clock frequencies up to 300MHz for high performance clock synthesis applications. It is available in various packages to serve various requirements.

The CY2308SXI-1H integrates a low-noise, low-jitter on-chip voltage-controlled oscillator (VCO) which allows operation up to 300MHz. The VCO frequency is used to drive a prescaler to generate clock signals in a programmable frequency range. An on-chip reference clock circuit is used to provide a reference frequency to establish the VCO frequency. The reference frequency is adjusted by an on-chip loop filter, and further regulated by a programmable feedback counter. The VCO frequency is controlled by LVCMOS period or frequency control signals or a serial link.

In order to achieve its clock generation functions, the CY2308SXI-1H consists of the following components:

• Voltage-controlled Oscillator (VCO)
• Prescaler
• Reference clock
• Loop filter
• Loop Amplifier
• PLL logic

The VCO generates the basic frequency to be used by the prescaler stage to generate PLL-controlled clock outputs at different frequencies.The frequency output range of the VCO is programmable, and the frequency range is determined by the user through the configuration control registers. The VCO can be programmed using the LVCMOS frequency/period control signals or a serial link.

The prescaler stage is used to divide the VCO’s output frequency and generate the output clock signals in the programmable frequency range. The clock output frequencies are determined by the user through the configuration control registers. The prescaler can be programmed using the LVCMOS frequency/period control signals or a serial link.

The reference clock is used to provide a reference frequency to establish the VCO frequency. The reference frequency is adjusted by an on-chip loop filter, and further regulated by a programmable feedback counter. The reference frequency is adjustable by the user through register programming, or through LVCMOS frequency/period control signals or a serial link.

The loop filter is used to filter the reference frequency and adjust it to the desired frequency. It is adjustable by both hardware and software.

The loop amplifier is used to amplify the filtered reference frequency and to provide the necessary current drive for the VCO. The loop amplifier can be adjusted by the user through register programming.

The PLL logic is used to control the reference and feedback counters. The logic can be programmed using the LVCMOS frequency/period control signals or a serial link.

The CY2308SXI-1H is designed for clock synthesis applications where high performance and low jitter is required. It can be used in many different applications such as communication networks, personal computing, embedded systems, and storage systems. In such applications, the clock generator can be used to reduce the number of power supply rails required, reduce board space and reduce electromagnetic interference (EMI).

In conclusion, the CY2308SXI-1H is a high performance clock generator, phase locked loop (PLL) frequency synthesizer that provides high performance, low jitter clock synthesis up to 300MHz. It includes a low-noise VCO, a prescaler to generate programmable clock outputs, an on-chip reference clock circuit, and a loop filter and loop amplifier to regulate the VCO. It can be used in many different applications requiring high performance clock synthesis, such as communication networks, personal computing, embedded systems and storage systems.

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