91857AGLFT

Differential - Input:Output:	No/Yes
Base Part Number:	ICS91857
Supplier Device Package:	48-TSSOP
Package / Case:	48-TFSOP (0.240", 6.10mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C
Voltage - Supply:	2.3 V ~ 2.7 V
Divider/Multiplier:	No/No
Frequency - Max:	230MHz
Series:	--
Ratio - Input:Output:	1:10
Number of Circuits:	1
Output:	SSTL-2
Input:	LVCMOS
PLL:	Yes with Bypass
Type:	Clock Driver
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction to 91857AGLFT

The 91857AGLFT is a clock generator, phase-locked loop (PLL) and frequency synthesizer commonly used in the processing of digital video signals for a variety of applications.The 91857AGLFT offers low-jitter clock generation and frequency synthesis with a high output range, single-shot and multiple-shot clocking, and implementable in a variety of form factors.

91857AGLFT Application Field and Working Principle

The 91857AGLFT has a wide range of applications, primarily in digital video processing applications such as motion compensation and frames-per-second conversion. It is commonly used to create clock signals with low jitter and wide frequency ranges, and is also capable of programmable clock frequency synthesis.The 91857AGLFT works by receiving an input clock signal and then regenerating an output clock signal that is based on the input clock signal. The output clock signal can have a multiplication or division factor that is applied to the input frequency.The 91857AGLFT can perform the process of clock multiplication or division with the help of a phase and frequency detector, low-pass filter, voltage-controlled oscillator, and a divide-by-N counter.The Phase and Frequency Detector (PFD) continuously monitors and compares the output clock signal with the input clock signal to find out the phase and frequency disparities between the two signals.These disparities are then transmitted to the Low-Pass Filter (LPF) which filters the data received from the phase and frequency detector and then sends the data to the Voltage Controlled Oscillator (VCO) in the form of an analog signal.The VCO then takes the analog signal and amplifies it, creating a higher-frequency output clock signal.The Divide-By-N Counter operates on the output clock signal and divides it down to a frequency that is a fraction of the original clock signal frequency.The output clock signal is then sent back to the phase and frequency detector, which again compares the newly generated signal to the input clock signal, and the process repeats itself continuously.

Conclusion

The 91857AGLFT is a highly capable PLL and frequency synthesizer system with a wide range of applications in digital video processing, such as motion compensation and frames-per-second conversion. It offers low-jitter clock generation and frequency synthesis with a high output range, and is able to scale clock frequencies up or down as needed. By using a PFD, LPF, VCO, and Divide-by-N counter, the 91857AGLFT can accurately generate the desired output clock signal.

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