P2041A

P2041A Versatile EMI Reduction IC Description The P2041A is a selectable spread spectrum frequency modulator designed specifically for PC peripheral and embedded controller markets. The P2041A reduces electromagnetic interference (EMI) at the clock source which provides system wide reduction of EMI of all clock dependent signals. The P2041A allows significant system cost savings by reducing the number of circuit board layers and shielding that are traditionally required to pass EMI regulations. The P2041A uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all−digital method. The P2041A modulates the output of a single PLL in order to “spread” the bandwidth of a synthesized clock and, more importantly, decreases the peak amplitudes of its harmonics. This results in significantly lower system EMI compared to the typical narrow band signal produced by oscillators and most frequency generators. Lowering EMI by increasing a signal’s bandwidth is called ‘spread spectrum clock generation.’ Applications The P2041A is targeted towards the embedded controller market and PC peripheral markets including scanners, MFP’s, printers, PDA, IA, and GPS devices. Features FCC Approved Method of EMI Attenuation Provides up to 20 dB of EMI Suppression Generates a Low EMI Spread Spectrum Clock of the Input Frequency Optimized for 25 MHz to 60 MHz Input Frequency Range Internal Loop Filter Minimizes External Components and Boar...