8T49N004A-056NLGI8

Series:	FemtoClock® NG
Packaging:	Tape & Reel (TR)
Part Status:	Active
PLL:	Yes with Bypass
Input:	Crystal
Output:	LVDS
Number of Circuits:	1
Ratio - Input:Output:	1:4
Differential - Input:Output:	No/Yes
Frequency - Max:	312.5MHz
Divider/Multiplier:	Yes/No
Voltage - Supply:	2.375 V ~ 3.465 V
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	32-VFQFN Exposed Pad
Supplier Device Package:	32-VFQFPN (5x5)

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Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

The 8T49N004A-056NLGI8 is a clock/timing device that is used to generate, synthesize, and phase-lock various frequencies from a single clock source. It is based on the popular TSSOP-8 and is designed for use in low-power, high-performance applications, such as communication systems, audio/video equipment, networking, and control systems.

Applications

The 8T49N004A-056NLGI8 can be used in a wide range of applications, such as:

• Data communications networks, such as SONET/SDH, Ethernet, Fibre Channel, and WiFi
• Voice over Packet (VoP) applications
• Industrial automation systems
• Medical and industrial imaging systems
• Consumer audio/video systems
• Telephone systems
• Automotive control systems
• Surveillance and security systems

Features

The 8T49N004A-056NLGI8 provides a range of features that make it an ideal clock/timing device for many applications, including:

• High precision: provides up to 25ppm of frequency accuracy for spread spectrum and up to 10ppm for PLL locked
• Flexible clocking: operates from 1MHz to 400MHz and supports up to eight outputs
• Low jitter: offers low jitter of 0.05ps RMS at the output using PLL locks
• Power efficient: low power consumption of just 1.6mA in active mode and 0.25uA in standby mode
• Wide operating temperature range: -40°C to +85°C
• Two operating modes: operating mode for low jitter, low power applications and ultra low jitter mode for high performance clock/timing applications
• Programmable input divider support: allows users to adjust the input frequency range from 1MHz to 400MHz

Working Principle

The 8T49N004A-056NLGI8 works by using a Phase Locked Loop (PLL) to generate multiple output clocks from a single input. The input clock is divided by an input divider before being sent to the PLL. The frequency of the PLL output is determined by the feedback divider ratio and the input divider ratio.The output of the PLL can then be divided further by an output divider before being sent to the outputs. The output frequencies can be further adjusted by programming the output divider, as well as the feedback and input dividers. The device also has a clock generator built-in that works independently from the PLL, allowing for a range of frequency and delay setting options. The clock generator is also capable of refreshing external components, such as sensors and displays, with a programmable cycle time. The 8T49N004A-056NLGI8 has selectable spread spectrum capabilities that can be used to reduce the peak of conducted emissions (EMI) for EMC compliance. The device is also capable of operating in a “single-shot” mode, allowing the user to load a profile into the device that is then automatically started and stopped. This mode is useful for applications such as power sequencing and system reset.

Conclusion

The 8T49N004A-056NLGI8 is an ideal device for generating, synthesizing, and phase-locking various frequencies from a single source. It is used in a wide range of applications, including data communications, voice over IP, industrial automation, medical imaging, consumer audio/video, telephone systems, and automotive control systems. The device has a number of features that make it a great choice for low-power and high-performance applications, including its high precision, low jitter, and flexible clocking. Its working principle is based on a Phase Locked Loop (PLL) circuit, and it also has built-in spread spectrum and single-shot modes for added functionality.

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