参数资料
型号: ICS601M-01LF
厂商: IDT, Integrated Device Technology Inc
文件页数: 3/9页
文件大小: 0K
描述: IC CLK MULT LOW PH/NOISE 16SOIC
标准包装: 48
类型: 时钟/频率合成器,时钟发生器
PLL: 带旁路
输入: 时钟,晶体
输出: CMOS
电路数: 1
比率 - 输入:输出: 2:2
差分 - 输入:输出: 无/无
频率 - 最大: 156MHz
除法器/乘法器: 是/是
电源电压: 3 V ~ 5.5 V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 16-SOIC(0.154",3.90mm 宽)
供应商设备封装: 16-SOIC
包装: 管件
产品目录页面: 1252 (CN2011-ZH PDF)
其它名称: 601M-01LF
800-1084
800-1084-5
800-1084-ND
ICS601-01
LOW PHASE NOISE CLOCK MULTIPLIER
CLOCK MULTIPLIER
IDT / ICS LOW PHASE NOISE CLOCK MULTIPLIER
3
ICS601-01
REV N 051310
Achieving Low Phase Noise
Figure 1 shows a typical phase noise measurement in a 125 MHz system. Therea are a few simple steps that can
be taken to achieve these levels of phase noise from the ICS601-01. Variations in VDD will increase the hase noise,
so it is important to have a stable, low noise supply voltage at the device. Use decoupling capacitors of 0.1
F in
parallel with 0.01
F. It is important to have these capacitors as close as possible to the ICS601-01 supply pins.
Disabling the REFOUT clock is also important for achieving low phase noise; lab tests have shown that this can
reduce the phase noise by as much as 10 dBc/Hz.
External Component/Crystal Selection
The ICS601-01 requires a minimum number of external components for proper operation. Decoupling capacitors of
0.01
F and 0.1F should be connected between VDD and GND, as close to the part as possible. A series
termination resistor of 33
may be used for each clock output. The crystal must be connected as close to the chip
as possible. The crystal should be fundamental mode, parallel resonant. Do not use third overtone. For exact tuning
when using a crystal, capacitors should beconnected from pins X1 to ground and X2 to ground. In general, the
value of these capacitors is given by the following equation, where CL is the crystal load capacitance: Crystal caps
(pF) = (CL - 5) x 2. So for a crystal with 16 pF load capacitance, two 22 pF caps can be used. For any given board
layout, ICS can measure the board capacitance and recommend the exact capacitance value to use.
Figure1. PhaseNoiseof ICS601-01for125MHzoutput, 25MHzcrystal input.
VDD=3.3V, REFOUTdisabled.
-140
-120
-100
-80
-60
-40
-20
0
1.00E+01
1.00E+02
1.00E+03
1.00E+04
1.00E+05
1.00E+06
1.00E+07
Offset fromCarrier (Hz)
Phase
Noise
(dBc/Hz
)
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