FEMTOCLOCKS™ VCXO BASED FREQUENCY TRANSLATOR/JITTER ATTENUATORThe ICS843002-31 is a member of the
HiperClockS family of high performance Clock
solutions from IDT. This monolithic device is a high-
performance, PLL-based synchronous Clock
generator and jitter attenuation circuit. The
ICS843002-31 contains two Clock multiplication stages that are
cascaded in series. The first stage is a VCXO-based PLL that
is optimized to provide reference Clock jitter attenuation, to be
jitter tolerant, and to provide a stable reference Clock for the
second multiplication stage. The second stage is the proprietary
IDT FemtoClock circuit which is a high-frequency, sub-
picosecond Clock multiplier.
The VCXO PLL has an on-chip VCXO circuit that uses an
external, inexpensive pullable crystal in the 17.5 to 25MHz
range. The PLL includes 13 bit reference and feedback
dividers supporting complex PLL multiplication ratios and
input reference Clock rates as low as 2.3kHz. External loop
Filter components are used (two resistors and two capacitors)
to achieve the low loop bandwidth needed for jitter atten-
uation of a recovered data Clock
The FemtoClock circuit CAN multiply the VCXO crystal frequency
by a factor of 28 or 32 (selectable) and provide a Clock output of
up to 700MHz By Integrated Device Technology
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ICS843002-31 Pb-Free | ICS843002-31 Cross Reference | ICS843002-31 Schematic | ICS843002-31 Distributor |
ICS843002-31 Application Notes | ICS843002-31 RoHS | ICS843002-31 Circuits | ICS843002-31 footprint |