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参数资料
| 型号： | ICS84334AYT |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 700 MHz, OTHER CLOCK GENERATOR, PQFP48 |
| 封装： | 7 X 7 MM, 1.40 MM HEIGHT, MS-026, LQFP-48 |
| 文件页数： | 8/21页 |
| 文件大小： | 335K |
| 代理商： | ICS84334AYT |
84334BY
www.icst.com/products/hiperclocks.html
REV. A JULY 22, 2004
16
Integrated
Circuit
Systems, Inc.
ICS84334
MULTI-RATE LVPECL FREQUENCY SYNTHESIZER
PRELIMINARY
V
CC - 2V
50
50
RTT
Z
o = 50
Z
o = 50
FOUT
FIN
RTT =
Z
o
1
((V
OH + VOL) / (VCC – 2)) – 2
3.3V
125
125
84
84
Z
o = 50
Z
o = 50
FOUT
FIN
The clock layout topology shown below is a typical termina-
tion for LVPECL outputs. The two different layouts mentioned
are recommended only as guidelines.
FOUTx and nFOUTx are low impedance follower outputs that
generate ECL/LVPECL compatible outputs.Therefore, terminat-
ing resistors (DC current path to ground) or current sources
must be used for functionality. These outputs are designed to
FIGURE 6B. LVPECL OUTPUT TERMINATION
FIGURE 6A. LVPECL OUTPUT TERMINATION
drive 50
transmission lines. Matched impedance techniques
should be used to maximize operating frequency and minimize
signal distortion.
Figures 6A and 6B show two different layouts
which are recommended only as guidelines. Other suitable clock
layouts may exist and it would be recommended that the board
designers simulate to guarantee compatibility across all printed
circuit and clock component process variations.
TERMINATION FOR 3.3V LVPECL OUTPUT
Figure 7. CRYSTAL INPUt INTERFACE
ICS84332
CRYSTAL INPUT INTERFACE
The ICS84334 has been characterized with 18pF parallel resonant
crystals. The capacitor values, C1 and C2, shown in
Figure 7 below
were determined using a 25MHz, 18pF parallel resonant crystal and
were chosen to minimize the ppm error. The optimum C1 and C2
values can be slightly adjusted for different board layouts.
84334
C1
18p
X1
18pF Parallel Crystal
C2
22p
XTAL_OUT
XTAL_IN
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICS843404 | 制造商:ICS 制造商全称:ICS 功能描述:LVCMOS/CRYSTAL-TO-3.3V LVPECL AND LVDS CLOCK GENERATOR |
| ICS843404AG | 制造商:ICS 制造商全称:ICS 功能描述:LVCMOS/CRYSTAL-TO-3.3V LVPECL AND LVDS CLOCK GENERATOR |
| ICS843404AGLF | 制造商:ICS 制造商全称:ICS 功能描述:LVCMOS/CRYSTAL-TO-3.3V LVPECL AND LVDS CLOCK GENERATOR |
| ICS843404AGLFT | 制造商:ICS 制造商全称:ICS 功能描述:LVCMOS/CRYSTAL-TO-3.3V LVPECL AND LVDS CLOCK GENERATOR |
| ICS843404AGT | 制造商:ICS 制造商全称:ICS 功能描述:LVCMOS/CRYSTAL-TO-3.3V LVPECL AND LVDS CLOCK GENERATOR |
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