The Fujitsu Spread Spectrum Clock Generator

Description
Electromagnetic interference (EMI), which is due to electromagnetic radiation emitted from an external source, is an unwanted disturbance in an electrical circuit. In general, EMI is generated when the clock oscillator outputs a high-frequency signal. To reduce EMI, various components need to be added to the board, increasing the time and resources to complete design and measurement.
The Fujitsu Spread Spectrum Clock Generator (SSCG) reduces radiated EMI that results from system clock operation. It minimizes the need for other shielding components like bypass capacitors, choke coil and ferrite bead, resulting in system-level cost savings.

FEATUREs
• Digital frequency modulation technique
    −Digital control using a current D/A converter achieves accurate frequency modulation compared to conventional analog control, which causes distortion and blunting in the modulated waveform
• Programmable product (built-in FRAM)
    −Set and save output frequency and modulation parameters by changing the multiplication / division clock rate
• Single input and multiple outputs (Max. 8 Clock outputs, Example: MB88181)
    −One device supports multiple clocks, thus reducing the need for other components such as oscillators
• Selectable modulation rate
    −No modulation, ±0.5%, ±1.0%, ±2.0%, -1.0%,
    -2.0%, -4.0%
• Enhanced input frequency range
    −8.3MHz to 134MHz
• Low current consumption
    −5.5mA @ 25MHz
• Power supply voltage range
    −1.65 V to 3.6 V
• Pin compatibility with other products in the market
• Package options
    −SOP8, TSSOP8, BCC6, BCC18, BCC20

APPLICATIONs
Industrial/Home Office
• FAX
• Digital copiers
• Scanners
• Printers
• Projectors

Consumer
• LCD monitors
• HDTVs
• PDAs
• Mobile phones

Networking
• Ethernet appliances
• LAN switches and hubs
• Servers