参数资料
型号: ICS8432DY-101LFT
厂商: IDT, Integrated Device Technology Inc
文件页数: 3/20页
文件大小: 0K
描述: IC SYNTHESIZER 700MHZ 32-LQFP
标准包装: 1,000
系列: HiPerClockS™
类型: 频率合成器
PLL: 带旁路
输入: HCSL,LVDS,LVHSTL,LVPECL,SSTL
输出: LVPECL
电路数: 1
比率 - 输入:输出: 1:2
差分 - 输入:输出: 是/是
频率 - 最大: 700MHz
除法器/乘法器: 是/无
电源电压: 3.135 V ~ 3.465 V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 32-LQFP
供应商设备封装: 32-TQFP(7x7)
包装: 带卷 (TR)
其它名称: 8432DY-101LFT
IDT / ICS 700MHZ, 3.3V LVPECL FREQUENCY SYNTHESIZER
11
ICS8432DY-101 REV. C APRIL 10, 2007
ICS8432-101
700MHZ, DIFFERENTIAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
V
CC - 2V
50
Ω
50
Ω
RTT
Z
o = 50Ω
Z
o = 50Ω
FOUT
FIN
RTT =
Z
o
1
((V
OH + VOL) / (VCC – 2)) – 2
3.3V
125
Ω
125
Ω
84
Ω
84
Ω
Z
o = 50Ω
Z
o = 50Ω
FOUT
FIN
The clock layout topology shown below is a typical termination
for LVPECL outputs. The two different layouts mentioned are
recommended only as guidelines.
FOUT and nFOUT are low impedance follower outputs that
generate ECL/LVPECL compatible outputs. Therefore, termi-
nating resistors (DC current path to ground) or current sources
must be used for functionality. These outputs are designed to
FIGURE 5B. LVPECL OUTPUT TERMINATION
FIGURE 5A. LVPECL OUTPUT TERMINATION
drive 50
Ω transmission lines. Matched impedance techniques
should be used to maximize operating frequency and minimize
signal distortion. Figures 5A and 5B 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 LVPECL OUTPUTS
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