参数资料
型号: 8N3Q001EG-203LCDI8
厂商: IDT, Integrated Device Technology Inc
文件页数: 3/21页
文件大小: 0K
描述: IC CLCK OSC QUAD FREQUENCY 5X7
特色产品: Fourth-generation FemtoClock for VCXO
标准包装: 1
系列: FemtoClock® NG
类型: 时钟振荡器
频率: 可调节/可选择
电源电压: 2.375 V ~ 3.465 V
电流 - 电源: 150mA
工作温度: -40°C ~ 85°C
封装/外壳: 10-CLCC
包装: 标准包装
供应商设备封装: 10-CLCC
安装类型: 表面贴装
其它名称: 800-2570-6
IDT8N3Q001 REV G Data Sheet
QUAD-FREQUENCY PROGRAMMABLE-XO
IDT8N3Q001GCD REVISION A MARCH 6, 2012
11
2012 Integrated Device Technology, Inc.
Termination for 3.3V LVPECL Outputs
The clock layout topology shown below is a typical termination for
LVPECL outputs. The two different layouts mentioned are
recommended only as guidelines.
The differential outputs are low impedance follower outputs that
generate ECL/LVPECL compatible outputs. Therefore, terminating
resistors (DC current path to ground) or current sources must be
used for functionality. These outputs are designed to drive 50
transmission lines. Matched impedance techniques should be used
to maximize operating frequency and minimize signal distortion.
Figures 1A and 1B 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.
Figure 1A. 3.3V LVPECL Output Termination
Figure 1B. 3.3V LVPECL Output Termination
3.3V
V
CC - 2V
R1
50
Ω
R2
50
Ω
RTT
Z
o = 50Ω
Z
o = 50Ω
+
_
RTT =
* Z
o
1
((V
OH + VOL) / (VCC – 2)) – 2
3.3V
LVPECL
Input
R1
84
Ω
R2
84
Ω
3.3V
R3
125
Ω
R4
125
Ω
Z
o = 50Ω
Z
o = 50Ω
LVPECL
Input
3.3V
+
_
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