EMI Reduction IC 8-Pin SOIC N T/R

The P28XX devices are versatile spread spectrum frequency modulators designed specifically for a wide range of input cl Deg Ck frequencies from 10MHz to 40MHz.The P28XX can generate an EMI reduced cl Deg Ck from crystal, ceramic resonator, or system cl Deg Ck. The P28XX-A and the P28XX-B offer various combinations of spread options and percentage deviations. These combinations include Down and Center Spread, and percentage deviation range from ±0.625% to -3.5%. The P28XX reduces electromagnetic interference (EMI) at the cl Deg Ck source, allowing system wide reduction of EMI of downstream cl Deg Ck and data dependent signals. The P28XX allows significant system cost savings by reducing the number of circuit board layers, ferrite beads, shielding, and other passive components that are traditionally required to pass EMI regulations. The P28XX modulates the output of a single PLL in order to “spread” the bandwidth of a synthesized cl Deg Ck, 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 cl Deg Ck generation’. The P28XX uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all-digital method.

• FCC approved method of EMI attenuation
• Provides up to 15dB EMI reduction
• Generates a 1x, 2x and 4x low EMI spread spectrum clock of the input frequency o 1x: P2811A/B o 2x: P2812A/B o 4x: P2814A/B
• Optimized for input frequency range from 10MHz to 40MHz
• Internal loop filter minimizes external components and board space
• Selectable spread options: o Down Spread and Center Spread
• 8 frequency deviation selections: o ±0.625% to -3.5%
• Low inherent Cycle-to-Cycle Jitter
• 3.3V Operating Voltage
• CMOS/TTL compatible inputs and outputs.
• Pin-out compatible with Cypress CY25811, CY25812 and CY25814
• Available in 8-pin SOIC Package