844256DGLF

Differential - Input:Output:	No/Yes
Base Part Number:	ICS844256
Supplier Device Package:	24-TSSOP-EP
Package / Case:	24-TSSOP (0.173", 4.40mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C
Voltage - Supply:	3.135 V ~ 3.465 V
Divider/Multiplier:	Yes/No
Frequency - Max:	625MHz
Series:	FemtoClock®
Ratio - Input:Output:	1:6
Number of Circuits:	1
Output:	LVDS
Input:	Crystal
PLL:	Yes with Bypass
Type:	Clock/Frequency Synthesizer, Fanout Distribution
Part Status:	Active
Packaging:	Tube

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Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

The 844256DGLF is an integrated circuit within a family of Broadcom clock generators. This particular IC contains a 3.2GHz Low-Jitter PLL/VCO integrated along with programmable dividers, allowing the user to produce a multitude of output frequencies derived from the reference frequency. This makes the 844256DGLF a highly-flexible and powerful potential replacement for discrete timing components, such as clock generators and frequency synthesizers.

Application Field

The 844256DGLF is most often used in applications where a multitude of different clock signals need to be generated. One of the most useful applications of this IC is in communications devices, where a high level of flexibility and programmability is essential. In this case, the 844256DGLF can provide output frequencies ranging from 1 kHz up to 3.2 GHz, which is suitable for a variety of applications such as data communication, reliable video transmission, and tuning of various other modules.Aside from communication-related applications, the 844256DGLF is also suitable for use in a variety of different electronics equipment, ranging from test and measurement equipment to multimedia systems. In all these cases, the programmable divide ratios allow for easy selection of multiple specific frequencies, which in turn enables the user to take advantage of multiple different features of the device.

Working Principle

The 844256DGLF operates by first separating an incoming Clock input signal into two different clocks, referred to as Private Reference Clock (PRC) and Private Reference Frequency (PRF). The PRF clock is then fed into the Phase-Locked Loop (PLL) circuit, where it is multiplied by a fixed factor, producing a VCO output. This output is then divided by a programmable divider, and the resulting output is fed through a programmable delay line and a frequency divider. This Signal is then sent to the differential outputs of the IC, which can then be handled by the user-side circuitry.The 844256DGLF also contains and integrated clock buffer, which allows for easy connection of the 7 differential outputs of the device, and outputs drives that can be configured to provide either single-ended or differential outputs. The user can configure these outputs to select from one of 8 available output frequency ranges and one of 16 possible output clock sources, giving them a high level of freedom in selecting the exact frequencies they require for their application.In addition to its various other features, the 844256DGLF also contains two registers for configuration, one of which is used to configure the dividers and delay lines, and the other is used to control the output buffer. By adjusting the parameters in these registers, the user can easily control the exact frequency and delay times of their desired clock signals.

Conclusion

Overall, the 844256DGLF is a highly capable integrated circuit from Broadcom, which can be used to produce a wide range of clock signals for a variety of applications. The device contains an on-board low-jitter PLL/VCO along with programmable dividers, delay lines, and registers, which allow for a level of flexibility and flexibility that is unmatched by similarly-priced components. The 844256DGLF is thus a highly recommended device for anyone looking to produce multiple clock signals with a single, integrated chip.

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