L2042A Datasheet | Alliance Semiconductor Corporation

Features - - - - - - - - - - - - - L2042A cost savings by reducing the number of circuit board layers ferrite beads, shielding and other passive ponents that are traditionally required to pass EMI regulations. The L2042A uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all digital method. The L2042A 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 pared 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’. FCC approved method of EMI attenuation. Provides up to 15d B of EMI suppression. Generates a low EMI spread spectrum clock of the input frequency. Input frequency range: 30MHz to 75 MHz. Optimized for 32.5MHz, 54MHz, and 65MHz. Internal loop filter minimizes external ponents and board space. Selectable spread deviation. SSON# control pin for spread spectrum enable and disable options. Low cycle-to-cycle jitter. 2.5V or 3.3V operating voltage range. TTL or CMOS patible outputs. Ultra-low power CMOS design. Supports most mobile graphic accelerator and LCD timing controller specifications. Available in 8-pin SOIC and TSSOP. - Applications The L2042A is targeted towards digital flat panel applications for Notebook PCs, Palm -size PCs, office automation equipment, and LCD monitors. Product Description The L2042A is a versatile spread spectrum frequency modulator designed specifically for digital falt panel applications. The L2042A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of down stream clock and data dependent signals. The L2042A allows significant system Block Diagram SR0 CP1 CP0 SSON# DIV2 Modulation CLKIN Frequency Divider Feedback...