8T49N281
Description
The 8T49N281 has a fractional-feedback PLL that can be used as a jitter attenuator or frequency translator. It is equipped with six integer and two fractional output dividers, allowing the generation of up to 8 different output frequencies, ranging from 8k Hz to 1GHz. Three of these frequencies are pletely independent of each other and the inputs. The other five are related frequencies. The eight outputs may select among LVPECL, LVDS or LVCMOS output levels.
This functionality makes it ideal to be used in any frequency translation application, including 1G, 10G, 40G and 100G Synchronous Ethernet, OTN, and SONET/SDH, including ITU-T G.709 (2009) FEC rates. The device may also behave as a frequency synthesizer.
The 8T49N281 accepts up to two differential or single-ended input clocks and a crystal input. The PLL can lock to either input clock, but both input clocks must be related in frequency.
The device supports hitless reference switching between input clocks. The device...
