Spread Spectrum Clock Generator - Fujitsu Media Devices
Description
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FUJITSU SEMICONDUCTOR DATA SHEET
DS04-29115-2E
Spread Spectrum Clock Generator
MB88154
■ DESCRIPTION
MB88154 is a clock generator for EMI (Electro Magnetic Interference) reduction.
The peak of unnecessary radiation noise (EMI) can be attenuated by making the oscillation frequency slightly modulate periodically with the internal modulator.
It corresponds to both of the center spread which modulates input frequency as Middle Centered and down spread which modulates so as not to exceed input frequency.
■ FEATURE
• Input frequency : 16.
6 MHz to 67 MHz • Output frequency: 16.
6 MHz to 67 MHz (One time input frequency) • Modulation rate can select from ± 0.
5%, ± 1.
0%, ± 1.
5% or − 1.
0%, − 2.
0%, − 3.
0%.
(For center spread / down spread.
) • Equipped with crystal oscillation circuit: Range of oscillation 16.
6 M MHz to 48 MHz • The external clock can be input: 16.
6 MHz to 67 MHz • Modulation clock output Duty : 40% to 60% • Modulation clock Cycle-Cycle Jitter : Less than 100 ps • Low current consumption by CMOS process : 5.
0 mA (24 MHz : Typ-sample, no load) • Power supply voltage : 3.
3 V ± 0.
3 V • Operating temperature : − 40 °C to +85 °C • Package : SOP 8-pin
■ PACKAGE
8-pin plastic SOP
(FPT-8P-M02)
MB88154
■ PRODUCT LINEUP
MB88154 has two kinds of input frequency, and two kinds of modulation type (center/down spread), total four lineups.
Product Input/Output frequency Modulation type MB88154-102 MB88154-103 MB88154-112 MB88154-113 33 MHz to 67 MHz 16.
6 MHz to 40 MHz 33 MHz to 67 MHz 16.
6 MHz to 40 MHz Down Center
■ PIN ASSIGNMENT
TOP VIEW
CKOUT 1 VDD 2 MB88154 VSS 3 XIN 4
8 SEL1 7 REFOUT 6 SEL0 5 XOUT
FPT-8P-M02
■ PIN DESCRIPTION
Pin name CKOUT VDD VSS XIN XOUT SEL0 REFOUT SEL1 I/O O ⎯ ⎯ I O I O I Pin no.
1 2 3 4 5 6 7 8 Modulated clock output pin Power supply voltage pin GND pin Crystal resonator connection pin/clock input pin Crystal resonator connection pin Modulation rate setting pin Non-modulated clock output pin Modulation rate setting ...
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