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参数资料
| 型号： | I2779A-08TT |
| 元件分类： | XO, clock |
| 英文描述： | 38 MHz, VIDEO CLOCK GENERATOR, PDSO8 |
| 封装： | TSSOP-8 |
| 文件页数： | 1/8页 |
| 文件大小： | 197K |
| 代理商： | I2779A-08TT |
June 2005
P2779A
rev 0.1
Alliance Semiconductor
2575, Augustine Drive
Santa Clara, CA Tel: 408.855.4900 Fax: 408.855.4999 www.alsc.com
Notice: The information in this document is subject to change without notice.
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
10 mA output drives
TTL or CMOS compatible outputs
Low power CMOS design
Available in 8-pin SOIC and TSSOP Packages
Available for Industrial temperature operating
range (-40 C to 85 C)
Product Description
The P2779A is a versatile spread spectrum frequency
modulator designed specifically for mobile and digital
camera and other digital video and imaging applications.
The P2779A reduces electromagnetic interference (EMI) at
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.
Block Diagram
VDD
PD
VSS
ModOUT
XIN
Frequency
Divider
Feedback
Divider
Modulation
Phase
Detector
Loop
Filter
VCO
Output
Divider
PLL
Crystal
Oscillator
XOUT
REF
LF
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相关代理商/技术参数 |
参数描述 |
|---|---|
| I2779A-08TTF | 制造商:ALSC 制造商全称:Alliance Semiconductor Corporation 功能描述:Low-Cost Notebook EMI Reduction IC |
| I2779AF-08SR | 制造商:ALSC 制造商全称:Alliance Semiconductor Corporation 功能描述:Low-Cost Notebook EMI Reduction IC |
| I2779AF-08-SR | 制造商:PULSECORE 制造商全称:PulseCore Semiconductor 功能描述:Low-Cost Notebook EMI Reduction IC |
| I2779AF-08ST | 制造商:ALSC 制造商全称:Alliance Semiconductor Corporation 功能描述:Low-Cost Notebook EMI Reduction IC |
| I2779AF-08-ST | 制造商:PULSECORE 制造商全称:PulseCore Semiconductor 功能描述:Low-Cost Notebook EMI Reduction IC |
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