MB88R157A FUJITSU [Fujitsu Component Limited.], MB88R157A Datasheet - Page 2

• Manufacturer Part Number: MB88R157A
• Description: Spread Spectrum Clock Generator Capable of Freely Setting the Output Clock Frequency
• Manufacturer: FUJITSU [Fujitsu Component Limited.]

to 1/100 in power.
The noise emitted from electrical devices (EMI) is regulated
by various international standards, including CISPR, as it has
negative effects (e.g., it can cause other electronic devices to
malfunction). Our SSCG digitally controls the clock frequency
that is the source of EMI noise. In this way, it is possible to avoid
unexpected noise generation and to easily satisfy international
standards.
Figure 2
Figure 2 EMI Reduction Effect in Actual Boards
Figure 1
Electromagnetic
field map
Measurement range
New Products
the EMI reduction effect on an actual board.
presents a diagram of the spread spectrum, and
Large
Small
EMI reduction effect is facilitated depending on the degree of modulation
Figure 1 Spread Spectrum
Modulation OFF
Conventional method
1.0% modulation
MB88R157A
-17.451dBm
40.11MHz
1.5% modulation
−13dB
Product Features
MB88R157A we have developed is not dependent on the
input frequency and the output frequency can be set at the
user’s discretion. It is thus possible to generate a unique clock
frequency within digital devices such as TVs, DVD players and
audio devices that can simultaneously be utilized as a noise
countermeasure.
The major advantages of SSCG include the following:
●
Our proprietary digital control technology delivers a high noise
reduction effect; it is possible to evaluate the actual noise with
the product built onto the board.
Our proprietary method
Figure 3 Pin Assignments
XOUT
PEX
VSS
OE
-27.136dBm
39.39MHz
2010
（TOP VIEW）
MB88R157A
−19dB
No.3
FIND Vol.28
XIN
NC
VDD
OUT