参数资料
型号: ICS843S1333DGLFT
厂商: IDT, Integrated Device Technology Inc
文件页数: 11/14页
文件大小: 0K
描述: IC CLK SYNTHESIZER 8TSSOP
标准包装: 2,500
系列: HiPerClockS™
类型: 时钟/频率合成器
PLL:
输入: 晶体
输出: LVPECL
电路数: 1
比率 - 输入:输出: 1:1
差分 - 输入:输出: 无/是
频率 - 最大: 1.333GHz
除法器/乘法器: 无/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: 8-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 8-TSSOP
包装: 带卷 (TR)
ICS843S1333DG REVISION A MAY 6, 2010
6
2010 Integrated Device Technology, Inc.
ICS843S1333D Data Sheet
CRYSTAL-TO-3.3V LVPECL CLOCK SYNTHESIZER
Application Information
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 ICS843S1333D provides
separate power supplies to isolate any high switching noise from the
outputs to the internal PLL. VCC and VCCA 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 VCC pin and also shows that VCCA requires that an
additional 10
resistor along with a 10F bypass capacitor be
connected to the VCCA pin.
Figure 1. Power Supply Filtering
Crystal Input Interface
The ICS843S1333D has been characterized with 18pF parallel
resonant crystals. The capacitor values, C1 and C2, shown in Figure
2 below were determined using a 20MHz, 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.
External tuning capacitor must be used for proper operation.
Figure 2. Crystal Input Interface
VCC
VCCA
3.3V
10
10F
.01F
XTAL_IN
XTAL_OUT
X1
18pF Parallel Crystal
C1
28pF
C2
28pF
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