849N212CKI-010LF

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. The two configurations are specified by the customer and are programmed by IDT during the final test phase from an on-hand stock of blank devices. The two configurations may be completely independent of one another.

• 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