Linear Technology has introduced a new low phase noise integer-N synthesizer with integrated VCO and ultra-low jitter clock distribution.
The LTC6951 is ideal for clock-to-data converters. It has four high-performance current-mode logic (CML) outputs, and each output is equipped with an independent low-noise clock divider and digital delay module to cover 1.95MHz to 2700MHz. Wide frequency range. The LTC6951 has a total of 115fsRMS absolute jitter (SNR method), which provides the low jitter clock required to achieve the best SNR when clocking data converters with high input frequencies and fast output data rates.
The LTC6951 introduces three smart schemes to simplify output clock expansion and create large clock trees for use in systems with multiple daughter cards or with large data converters. Linear Technology's proprietary EZSync output synchronization method ensures a repeatable and deterministic phase relationship between all clock divider outputs on the LTC6951 and the accompanying EZSync support device. ParallelSync's multi-chip parallel synchronization feature allows the output of multiple LTC6951 ICs to be retimed to a common reference clock. This allows reference-aligned synchronization in the reference clock domain with easy-to-follow nanosecond range setting and hold time requirements.
The LTC6951Wizard simulation and design tool allows easy design of the LTC6951, which can be downloaded for free from www.linear.com.cn/LTC6951Wizard . The LTC6951Wizard software provides appropriate PLL settings and loop filter component values at the click of a button, and accurately predicts phase noise and jitter for a single output. In addition to performance simulation, the LTC6951Wizard GUI also has an oscilloscope chart, which is based on the clock divider, delay, and synchronization settings to simulate the time domain results of the LTC6951 output, thereby simplifying the design process and assisting the circuit debugging phase.
The LTC6951 is rated for operation from -40C to 105C. It is available in a space-saving 5mm x 7mm 40-lead plastic QFN package. The company says it can provide samples and demo boards.
