參數(shù)資料
型號(hào): MPC92439FN
廠商: INTEGRATED DEVICE TECHNOLOGY INC
元件分類: 時(shí)鐘產(chǎn)生/分配
英文描述: 900 MHz, OTHER CLOCK GENERATOR, PQCC28
封裝: PLASTIC, LCC-28
文件頁數(shù): 2/13頁
文件大小: 840K
代理商: MPC92439FN
MPC92439
900MHZ, LOW VOLTAGE, LVPECL CLOCK SYNTHESIZER
IDT / ICS LVPECL CLOCK SYNTHESIZER
10
MPC92439 REV 3 JANUARY 7, 2008
signals into the oscillator. Short and wide traces further reduce
parasitic inductance and resistance. It is further recommended
to guard the crystal circuit by placing a ground ring around the
traces and oscillator components. See Table 12 for
recommended crystal specifications.
As an alternative to parallel resonance mode crystals, the
oscillator also works with crystals specified in the series
resonance mode. With series resonance crystals, the oscillator
frequency and the synthesized output frequency of the
MPC92439 will be a approximately 350-400 ppm higher than
using crystals specified for parallel frequency mode. This is
applicable to applications using the MPC92439 in sockets
designed for the pin and function compatible MC12439
synthesizer, which has an oscillator using the crystal in its series
resonance mode.Table 13 shows the recommended
specifications for series resonance mode crystals
Table 12. Recommended Crystal Specifications
Parameter
Value
Crystal Cut
Fundamental AT Cut
Resonance Mode
Parallel
Crystal Frequency
10 - 20 MHz
Shunt Capacitance C0
5 - 7 pF
Load Capacitance CL
10 pF
Equivalent Series Resistance ESR
20–60
Table 13. Alternative Crystal Specifications
Parameter
Value
Crystal Cut
Fundamental AT Cut
Resonance Mode
Series
Crystal Frequency
10 - 20 MHz
Shunt Capacitance C0
5 - 7 pF
Equivalent Series Resistance ESR
50–80
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