348RIPLF

Differential - Input:Output:	No/No
Base Part Number:	ICS348
Supplier Device Package:	20-QSOP
Package / Case:	20-SSOP (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Voltage - Supply:	3.15 V ~ 3.45 V
Divider/Multiplier:	No/Yes
Frequency - Max:	200MHz
Series:	VersaClock®
Ratio - Input:Output:	1:9
Number of Circuits:	1
Output:	LVCMOS
Input:	Clock, Crystal
PLL:	Yes with Bypass
Type:	Clock/Frequency Synthesizer
Part Status:	Obsolete
Packaging:	Tube

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348RIPLF Application Field and Working Principle

The 348RIPLF is a clock generator, an oscillator or frequency synthesizer. It is a precision, low power, low noise frequency synthesizer specifically designed for clock and timing applications. This type of clock device is applicable in telecommunications, computer systems, and instrumentation systems.

Overview

The 348RIPLF is a Frequency Synthesizer that features a wide range and high resolution of frequencies and programmability available. It employs a Phase-Locked Loop (PLL) design using a voltage-controlled oscillator (VCO) in combination with a high-speed Frequency Divider. This provides a wide frequency range with a high degree of controlability. The device is suitable for a variety of applications such as clock/timing management in telecommunications, computer systems and instrumentation systems.

Design

The 348RIPLF is designed to provide a wide frequency range and a programmable frequency range up to 600 MHz. It contains three basic sections: the Voltage Controlled Oscillator (VCO), the Frequency Divider and the Programmable Frequency Modulator (PFM). In addition, it is designed to fit into a small package with a minimal power consumption.The VCO is designed with a low input impedance to improve output frequency stability. The Frequency Divider uses a complex programmable logic array (CLA) to divide the input frequency with up to 250 internal steps. The PFM converts the programmable frequency range to the desired output frequency.

Principles of Operation

In order to understand the principles of operation of the 348RIPLF, it is important to understand the concept of a phase-locked loop. As its name implies, a phase-locked loop (PLL) is an arrangement of components which attempts to "lock" its output to a particular phase of the input signal.A basic PLL contains three components: a voltage-controlled oscillator (VCO), a frequency divider, and a phase comparator. The VCO is designed to generate an output frequency that is proportional to its input voltage. The frequency divider divides the frequency of the VCO\'s output, and typically has at least two outputs: a divided down output, and a divided up output. The phase comparator compares the phase of the divided down output with that of the divided up output, and uses this comparison to control the input voltage of the VCO until the two output signals match in phase.In the 348RIPLF, the VCO is designed to generate a wide range of frequencies from very low to very high. The frequency divider is used to divide the input frequency by a programmable number of steps. The programmable frequency modulator (PFM) then takes the divided output and converts it to the desired output frequency. By controlling the frequency divider and the PFM, the output frequency of the device can be programmed over a range of frequencies.

Applications

The 348RIPLF can be used in a variety of telecommunications, computer systems, and instrumentation systems. Some specific applications are:• Clock/timing management in telecommunications systems• Clock recovery in computer systems• Master clock synchronization in instrumentation systems• Frequency hopping radio systems• Automotive timing systems

Conclusion

The 348RIPLF is a frequency synthesizer designed for clock and timing applications in telecommunications, computer systems and instrumentation systems. It is a precision, low power, low noise device that offers a wide range and high resolution of frequencies, as well as programmability. By employing a Phase-Locked Loop design, the device is able to control the output frequency over a wide range, as well as ensure a high degree of accuracy.

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