849N212CKI-010LFT

The ICS849N212I is a highly flexible FemtoClock NG general purpose, low phase noise Frequency Translator / Synthesizer with alarm and monitoring functions suitable for networking and communications applications. It is able to generate any output frequency in the 1MHz - 250MHz range (see Table 3 for details). A wide range of input reference clocks and a range of low-cost fundamental mode crystal frequencies may be used as the source for the output frequency. The ICS849N212I has three operating modes to support a very broad spectrum of applications: 1) Frequency Synthesizer Synthesizes output frequencies from a 16MHz - 40MHz fundamental mode crystal. Fractional feedback division is used, so there are no requirements for any specific crystal frequency to produce the desired output frequency with a high degree of accuracy. 2) High-Bandwidth Frequency Translator Applications: PCI Express, Computing, 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, so it will not attenuate much jitter on the input reference. 3) Low-Bandwidth Frequency Translator Applications: Networking & Communications. Translates any input clock in the 8kHz - 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 crystal to provide significant jitter attenuation. This device provides two factory-programmed default power-up configurations burned into One-Time Programmable (OTP) memory. The configuration to be used is selected by the CONFIG pin.

• Fourth generation FemtoClock® NG technology
• Universal Frequency Translator/Frequency Synthesizer
• Two outputs
  • One programmable as LVPECL or LVDS
  • One LVCMOS
  • Both outputs may be set to use 2.5V or 3.3V output levels
  • Programmable output frequency: 1.0MHz to 250MHz
• Two differential inputs support the following input types: LVPECL, LVDS, LVHSTL, HCSL
• Input frequency range: 8kHz - 710MHz
• Crystal input frequency range: 16MHz - 40MHz
• Two factory-set register configurations for power-up default state
• Power-up default configuration pin or register selectable
• Configurations customized via One-Time Programmable ROM
• Settings may be overwritten after power-up via I2C
• I2C Serial interface for register programming
• RMS phase jitter at 125MHz, using a 40MHz crystal (12kHz - 20MHz): 558fs (typical), Low Bandwidth Mode (FracN)
• RMS phase jitter at 125MHz, using a