Clock Generator Counteracts EMI, Allows up to 134MHz Output

( 1 Jul 2008 )

Providing countermeasures against electromagnetic interference (EMI) on high-frequency clock signals, the MB88R157 spread-spectrum clock generator (SSCG) of Fujitsu Microelectronics Ltd (FML) includes embedded FRAM, an industry first, which features fast rewriting speed, and allows customers to vary its frequency output over a range of 1MHz to 134MHz while mounted on a circuit board.

The new LSI features Fujitsu Microelectronics' circuit design technology, enabling reduction of product power consumption in continuous operation by up to 40 percent compared to similar competitive products. As it is easy to rewrite parameters in this new LSI, the device is suitable for a wide range of applications including multi-functional printers, PCs, and mobile phones, as well as for TVs, DVD players, and game consoles.

The MB88R157 allows the customer to vary the clock rate, adjust the modulation rate, decide whether to use modulation at all, and set stable oscillation capacitance values for stable frequency output. These parameters can be stored in the builtin FRAM, giving the customers the convenience of changing the parameters while the chip remains mounted on its circuit board.

The device features an embedded stable oscillator capacitor required for stable frequency output. It also includes patent-pending digital frequency modulation control technology and modulation cycle combination technology, both technologies from Fujitsu VLSI Ltd, as well as Fujitsu Microelectronics' own FRAM technology.

Fujitsu Microelectronics Ltd