器件名称: I2779AF-08-SR
功能描述: Low-Cost Notebook EMI Reduction IC
文件大小: 360.52KB 共8页
简 介:February 2007 rev 0.2 Low-Cost Notebook EMI Reduction IC
Features
Provides up to 15dB of EMI suppression FCC approved method of EMI attenuation Generates a 1X low EMI spread spectrum clock of the input frequency Operates between 20MHz and 38MHz input frequency range External loop filter for spread percentage adjustment Spreading ranges from ±0.25% to ±2.5% Ultra low cycle-to-cycle jitter Zero-Cycle slip at small deviations 3.3 V Operating Voltage Low power CMOS design Available in 8-pin SOIC and TSSOP Packages Available in Industrial temperature operating range (-40 C to 85 C)
P2779A
the clock source, which provides system-wide reduction of EMI of all clock dependent signals. The P2779A allows significant system cost savings by reducing the number of circuit board layers and shielding that are traditionally required to pass EMI regulations. The P2779A uses the most efficient and optimized modulation profile approved by the FCC. The P2779A 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 P2779A is targeted toward mobile 3D graphics chip set applications.
Product Description
The P2779A is a versatile……
