器件名称: 8741004BGIT
功能描述: DIFFERENTIAL-TO-LVDS/0.7V DIFFERENTIAL PCI EXPRESS
文件大小: 1993.53KB 共20页
简 介:PRELIMINARY
DIFFERENTIAL-TO-LVDS/0.7V DIFFERENTIAL PCI EXPRESS JITTER ATTENUATOR
ICS8741004I
General Description
The ICS8741004I is a high performance Differential-to-LVDS/0.7V Differential Jitter HiPerClockS Attenuator designed for use in PCI Express systems. In some PCI Express systems, such as those found in desktop PCs, the PCI Express clocks are generated from a low bandwidth, high phase noise PLL frequency synthesizer. In these systems, a jitter attenuator may be required to attenuate high frequency random and deterministic jitter components from the PLL synthesizer and from the system board. The ICS8741004I has 3 PLL bandwidth modes: 200kHz, 600kHz and 2MHz. The 200kHz mode will provide maximum jitter attenuation, but with higher PLL tracking skew and spread spectrum modulation from the motherboard synthesizer may be attenuated. The 600kHz provides an intermediate bandwidth that can easily track triangular spread profiles, while providing good jitter attenuation. The 2MHz bandwidth provides the best tracking skew and will pass most spread profiles, but the jitter attenuation will not be as good as the lower bandwidth modes. Because some 2.5Gb serdes have x20 multipliers while others have x25 multipliers, the ICS8741004I can be set for 1:1 mode or 5/4 multiplication mode (i.e. 100MHz input/125MHz output) using the F_SEL pins.
Features
Two LVDS and two 0.7V differential output pairs Bank A has two LVDS output pairs and Bank B has two 0.7V differential outp……
