LMX2336USLEX

Differential - Input:Output:	Yes/No
Base Part Number:	LMX2336
Supplier Device Package:	20-ULGA (3.5x3.5)
Package / Case:	20-UFLGA
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Voltage - Supply:	2.7 V ~ 5.5 V
Divider/Multiplier:	Yes/No
Frequency - Max:	2GHz, 1.2GHz
Series:	PLLatinum™
Ratio - Input:Output:	3:1
Number of Circuits:	1
Output:	CMOS
Input:	CMOS, TTL
PLL:	Yes with Bypass
Type:	PLL Frequency Synthesizer
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

The LMX2336USLEX (hereinafter referred to as "USLEX") is a high performance integrated clock/timing generator from Texas Instruments. It is designed to meet the needs of multirate clock systems such as computing, networking, communications, consumer and automotive applications. USLEX integrates a wide variety of features that enable sophisticated clock tree architectures. It is tailored for applications involving up to 15 user-defined frequencies in addition to the fundamental frequency of 100 MHz. USLEX also provides an flexibility to users in terms of selecting the lowest common multiple (smallest step size), configurable spread spectrum, and programmable jitter.

Application Field

The highly flexible USLEX clock generator addresses a wide variety of system-level clock requirements in a single package. It is well suited for applications that require multiple output signals at different frequencies such as so-called \'ad-hoc\' systems. A typical application that requires multiple frequencies is networking or communication systems where signals are exchanged between different transmitters and receivers. Examples of such systems, where the USLEX clock generator would be ideal are profibus networks, CAN bus networks, ADSL base stations and wireless local area networks.

Working Principle

The USLEX clock generator uses a phase locked loop (PLL) to generate the required multiple frequencies. The PLL consists of an oscillator and a phase detector, which detects the phase differences between the oscillator and an incoming reference signal. The output of the phase detector is applied to a voltage controlled oscillator (VCO). The VCO creates the required output signals; these signals are subsequently multiplied and divided to generate the desired frequencies.The USLEX clock generator uses a hierarchical ringing architecture that enables very small step size and low phase noise. The hierarchical ringing architecture enables very small but accurate step sizes, which allow the generator to create very dense frequency grids and high-channel density applications. The USLEX also utilizes low-noise charge pumps that reduce jitter and phase noise.

Conclusion

In conclusion, the LMX2336USLEX is a high performance high-density clock generator from Texas Instruments and is well suited for applications that require multiple output signals of different frequencies.USLEX\'s integrated features such as its hierarchical ringing architecture, low-noise charge pumps and wide clock multiple range make it ideal for use in multirate clock systems such as computing, networking, communications, consumer and automotive applications.

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