CDCV857DGGR

Differential - Input:Output:	Yes/Yes
Base Part Number:	CDCV857
Supplier Device Package:	48-TSSOP
Package / Case:	48-TFSOP (0.240", 6.10mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 85°C
Voltage - Supply:	2.3 V ~ 2.7 V
Divider/Multiplier:	No/No
Frequency - Max:	200MHz
Series:	--
Ratio - Input:Output:	1:10
Number of Circuits:	1
Output:	Clock
Input:	Clock
PLL:	Yes with Bypass
Type:	PLL Clock Driver
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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CDCV857DGGR, a high speed clock generator from Texas Instruments, is a member of the integrated circuit family, which is used as “smooth frequency synthesizers” to generate various clock signals from one common input. The device supports a broad range of clock frequencies, outputs options and spread spectrum capabilities for RF systems with low EMI concerns. It is primarily used for many clocking applications ranging from communication infrastructure to mobile and consumer products.The CDCV857DGGR is a highly integrated, low power , multi-modal clock generator which is designed to reduce the complexity of radio frequency system designs. The device consists of a wideband modulator, a differential clock driver and selectable logic outputs. It helps to save board space needed for multiple clock sources and results in a cost savings in the clocking portion of the design.By combining the wideband modulator, adjustable spread spectrum and clock driver, the CDCV857DGGR also features controlled and precise output frequencies, adjustable phase and width of jitter, and stand-alone operation. Its four programmable divider blocks and various outputs create multiple low-jitter clock output frequencies on four independent or cascaded phase-locked loops (PLLs). This enables designers to realize high bandwidth communications systems that need to support multiple clock frequencies over a broad frequency range.The CDCV857DGGR can be used for wireless RF systems with low EMI requirements where its optional spread spectrum operations are beneficial. With a frequency range of up to 1GHz, the device can be used in various high bandwidth applications such as 3G/4G Long Term Evolution (LTE), 802.11ac, WiMAX, broadcasting and high definition data transfers.The wideband modulator functions to minimize output jitter due to clock switching and the EMI-absorbing spread spectrum modulation allows for reduced EMI emission. This device also features two PLL outputs, two buffered reference outputs, and one output of the wideband modulator which can be used as a clock input. It is available in an 8-lead LLP package and a 16-lead TSSOP package. The CDCV857DGGR is also well-suited for matrix and stand-alone clock networks where a single source can generate clock signals for multiple frequencies that can be activated in sequence to minimize power consumption by the system. Its high level of integration, adjustable phase jitter and low EMI performance make it an excellent choice for many clock network designs.The working principle of CDCV857DGGR is similar to that of other clock generators. It receives an input clock signal and passes it through the wideband modulator, which generates a wideband replica of the input clock. This high-frequency signal is then split into various channels of related frequencies. The frequency of each individual channel is adjusted through programmable dividers and then passed through adjustable delay chains to generate a set of low-jitter clock signals with adjustable duty cycles. Finally, these clock signals are transmitted through selectable logic outputs to the digital system. In summary, the CDCV857DGGR is one of the most advanced clock generators available, which provides a wide range of features and capabilities to meet the needs of clock networks in a variety of applications. It is highly integrated and offers selectable logic output, EMI absorbing spread spectrum modulation, and adjustable phase and width jitter. It is also available in multiple package types and offers a wide frequency range of up to 1GHz, making it ideal for high bandwidth applications such as 3G/4G LTE, 802.11ac, and WiMAX.

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