MB88R157A Datasheet, PDF (1/4 Pages) Fujitsu Component Limited. – Spread Spectrum Clock Generator Capable of Freely Setting the Output Clock Frequency

New Products
MB88R157A
Spread Spectrum Clock Generator
Capable of Freely Setting the Output
Clock Frequency
MB88R157A
We have added MB88R157A with built-in FRAM to our lineup of spread spectrum
clock generator (SSCG) products that are effective measures against EMI noise.
The output frequency can be set at the user ^,s discretion between 1MHz and 134MHz
for the input frequency of 10MHz to 50MHz.
* ^{SSCG: Spread Spectrum Clock Generator}
* ^{FRAM: Ferroelectric Random Access Memory (nonvolatile memory utilizing ferroelectric)}
Introduction
In recent years, electronic devices have adopted higher
performance (speed) and smaller sizes (higher density) and, as
a result, their noise emission has been growing steadily. Noise
problems are often the final challenge to overcome prior to the
mass production of a product following the trial and error of
product design and evaluation. As electrical signals (the clock
frequency that operates a system) and noise are intrinsically
the same, it is important to take noise countermeasures into
consideration at the board system design stage of a product.
This product not only simplifies noise countermeasures but
also dramatically saves on the time spent developing noise
countermeasures later, thereby minimizing the cost and evaluation
time.
Our SSCG controls the clock frequency in an ideal fashion
by applying our proprietary digitally controlled (current D/A
converter) “frequency modulation technology” and “composite
modulation technology.” It achieves −19dB (measurement value by
FUJITSU, 1.5％ modulation degree used), which corresponds
Photo 1 External View
What is SSCG?
SSCG is a product that reduces the emission of unnecessary noise
by slightly fluctuating (modulating) the clock frequency that is the
source of noise in a range that does not affect the system operation.
2010 No.3 FIND Vol.28