ICS8530I-01 Datasheet, PDF (5/18 Pages) Integrated Circuit Systems – LOW SKEW, 1-TO-16 DIFFERENTIAL-TO-3.3V LVPECL FANOUT BUFFER

ICS8530DYI-01 Data Sheet
LOW SKEW, 1-TO-16 DIFFERENTIAL-TO-3.3V LVPECL FANOUT BUFFER
Additive Phase Jitter
The spectral purity in a band at a specific offset from the fundamental
compared to the power of the fundamental is called the dBc Phase
Noise. This value is normally expressed using a Phase noise plot
and is most often the specified plot in many applications. Phase
noise is defined as the ratio of the noise power present in a 1Hz band
at a specified offset from the fundamental frequency to the power
value of the fundamental. This ratio is expressed in decibels (dBm)
or a ratio of the power in the 1Hz band to the power in the
fundamental. When the required offset is specified, the phase noise
is called a dBc value, which simply means dBm at a specified offset
from the fundamental. By investigating jitter in the frequency domain,
we get a better understanding of its effects on the desired application
over the entire time record of the signal. It is mathematically possible
to calculate an expected bit error rate given a phase noise plot.
Additive Phase Jitter @ 106.25MHz
12kHz to 20MHz = 0.162ps (typical)
Offset from Carrier Frequency (Hz)
As with most timing specifications, phase noise measurements has
issues relating to the limitations of the equipment. Often the noise
floor of the equipment is higher than the noise floor of the device. This
is illustrated above. The device meets the noise floor of what is
shown, but can actually be lower. The phase noise is dependent on
the input source and measurement equipment.
ICS8530DYI-01 REVISION A FEBRUARY 22, 2011
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