IDT8T49N445I Datasheet | Renesas

Description The IDT8T49N445I is a quad PLL with Femto Clock® NG technology. The IDT8T49N445I integrates low phase noise Frequency Translation / Synthesizer and jitter attenuation. It includes alarm and monitoring functions suitable for networking and munications applications. The device has four fully independent PLLs, each PLL is able to generate any output frequency in the 0.98MHz - 312.5MHz range and most output frequencies in the 312.5MHz - 1,300MHz range (see Table 3 for details). A wide range of input reference clocks may be used as the source for the output frequency. Each PLL of IDT8T49N445I has three operating modes to support a very broad spectrum of applications: 1) Frequency Synthesizer - Synthesizes output frequencies from an external reference clock REFCLK. - Fractional feedback division is used, so there are no requirements for any specific input reference clock frequency to produce the desired output frequency with a high degree of accuracy. 2) High-Bandwidth Frequency Translator - Applications: PCI Express, puting, General Purpose - Translates any input clock in the 16MHz - 710MHz frequency range into any supported output frequency. - This mode has a high PLL loop bandwidth in order to track input reference changes, such as Spread-Spectrum Clock modulation. 3) Low-Bandwidth Frequency Translator - Applications: Networking & munications. - Translates any input clock in the 8k Hz -710MHz frequency range into any supported output frequency. - This mode supports PLL loop bandwidths in the 10Hz - 580Hz range and makes use of an external reference clock REFCLK to provide significant jitter attenuation. Each PLL provides factory-programmed default power-up configuration burned into One-Time Programmable (OTP) memory. The configuration is specified by the customer and are programmed by IDT during the final test phase from an on-hand stock of blank devices. To implement other configurations, these power-up default settings can be overwritten after power-up...