LMX2354TM/NOPB

Differential - Input:Output:	Yes/No
Base Part Number:	LMX2354
Supplier Device Package:	24-TSSOP
Package / Case:	24-TSSOP (0.173", 4.40mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Voltage - Supply:	2.7 V ~ 5.5 V
Divider/Multiplier:	Yes/Yes
Frequency - Max:	2.5GHz, 550MHz
Series:	PLLatinum™
Ratio - Input:Output:	3:3
Number of Circuits:	1
Output:	CMOS
Input:	CMOS, TTL
PLL:	Yes with Bypass
Type:	PLL Frequency Synthesizer
Part Status:	Obsolete
Packaging:	Tube

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LMX2354TM/NOPB Application Field and Working Principle

The LMX2354TM/NOPB is a highly configurable clock generator, PLL, and frequency synthesizer from Texas Instruments. This device supports output frequencies ranging from 5MHz to 810MHz and can be used for a variety of applications, especially those needing low power consumption. It features dual-output functionality and features selectable single-ended/differential outputs, or LVDS/CMOS outputs. This paper will discuss the application field and working principle of the device.

Application Field

The LMX2354TM/NOPB device is a versatile clock and frequency generator suitable for a wide range of applications. It is particularly suited for applications where low-power consumption is a priority, such as:

• Networking Equipment
• Broadcast Video
• Medical Imaging
• Closed-circuit Television
• Data Storage

The device is also suitable for use in communications applications including wireless networks, as well as in industrial and automotive applications.

Working Principle

The LMX2354TM/NOPB is based on a Phase Locked Loop (PLL) architecture. This means it can generate a derivative frequency from the input frequency. It works by sampling the input frequency and will generate a frequency based on the reference frequency. The output frequency is determined by the local oscillator frequency and by the parameters of the PLL.The device is an all-digital device, with all parameters adjustable through an I2C or SPI interface. The flexible user interface allows for a wide range of output frequencies, from 5 MHz to 810 MHz.The PLL uses a fractional-N frequency synthesizer architecture to generate outputs of high resolution and accuracy. This also enables the device to track input frequency changes and generate an output signal whose frequency always matches the input frequency. The output frequency can also be adjusted in real-time, using an external reference signal.

Conclusion

The LMX2354TM/NOPB is a highly configurable clock generator, PLL, and frequency synthesizer that is well suited for applications where power consumption is a priority. It uses a fractional-N frequency synthesizer architecture to generate outputs of high resolution and accuracy and has a flexible user interface that allows for a wide range of output frequencies, from 5MHz to 810MHz.

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