参数资料
型号: ICS840004AG-11LFT
厂商: IDT, Integrated Device Technology Inc
文件页数: 12/13页
文件大小: 0K
描述: IC FREQ SYNTHESIZER 20-TSSOP
标准包装: 2,500
系列: HiPerClockS™, FemtoClock™
类型: 频率合成器
PLL:
输入: 晶体
输出: LVCMOS,LVTTL
电路数: 1
比率 - 输入:输出: 1:4
差分 - 输入:输出: 无/无
频率 - 最大: 140MHz
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: 20-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 20-TSSOP
包装: 带卷 (TR)
其它名称: 840004AG-11LFT
ICS840004-11 Data Sheet
FEMTOCLOCK CRYSTAL-TO-LVCMOS/LVTTL FREQUENCY SYNTHESIZER
ICS840004AG-11 REVISION A SEPTEMBER 16, 2009
8
2009 Integrated Device Technology, Inc.
Application Information
Recommendations for Unused Input and Output Pins
Inputs:
LVCMOS Control Pins
All control pins have internal pullups; additional resistance is not
required but can be added for additional protection. A 1k
resistor
can be used.
Outputs:
LVCMOS Outputs
All unused LVCMOS outputs can be left floating. We recommend that
there is no trace attached.
Power Supply Filtering Technique
As in any high speed analog circuitry, the power supply pins are
vulnerable to random noise. To achieve optimum jitter performance,
power supply isolation is required. The ICS840004-11 provides
separate power supplies to isolate any high switching noise from the
outputs to the internal PLL. VDD, VDDA and VDDO should be
individually connected to the power supply plane through vias, and
0.01F bypass capacitors should be used for each pin. Figure 1
illustrates this for a generic VDD pin and also shows that VDDA
requires that an additional 10
resistor along with a 10F bypass
capacitor be connected to the VDDA pin.
Figure 1. Power Supply Filtering
VDD
VDDA
3.3V
10
10F
.01F
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