ICS830S21I Datasheet, PDF (5/11 Pages) Integrated Device Technology – 1-TO-1 2.5V, 3.3V DIFFERENTIAL-TOLVCMOS/LVTTL TRANSLATOR

ICS830S21I
1-TO-1, 2.5V, 3.3V DIFFERENTIAL-TO-LVCMOS/LVTTL TRANSLATOR
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 @ 350MHz
12kHz to 20MHz = 0.11ps (typical)
Offset 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.
IDT™ / ICS™ LVCMOS/LVTTL TRANSLATOR
5
ICS830S21AMI REV. A MARCH 21, 2008