参数资料
型号: SM840001KA
厂商: Micrel Inc
文件页数: 6/8页
文件大小: 0K
描述: IC CLOCK SYNTHESIZER 8TSSOP
产品培训模块: High Bandwidth Product Overview
标准包装: 150
系列: RotaryWave™
类型: 时钟/频率合成器,多路复用器
PLL:
输入: 晶体
输出: LVCMOS,LVTTL
电路数: 1
比率 - 输入:输出: 1:1
差分 - 输入:输出: 无/无
频率 - 最大: 226.66MHz
除法器/乘法器: 是/无
电源电压: 2.375 V ~ 3.465 V
工作温度: -40°C ~ 75°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: 管件
其它名称: 576-3695-5
SM840001KA-ND
Micrel, Inc.
SM840001
March 2010
6
M9999-031810-B
hbwhelp@micrel.com or (408) 955-1690
Power Supply Filtering
The SM840001 provides separate power supply pins to
isolate any high switching noise from outputs to internal
core blocks. VDD and VDDA should be individually
connected to the power plane through vias. Bypass
capacitors should be used for each pin. Figure 2
illustrates how the power supply filter for 3.3V and 2.5V
is configured.
Figure 2.
Crystal Loading
Crystal Recommendations
This device requires a parallel resonance crystal.
Substituting a series resonance crystal will cause this
device to operate at the wrong frequency and violate the
ppm specifications.
To achieve low ppm error, the total capacitance of the
crystal must be considered in order to calculate
appropriate capacitive loading (CL).
Load Capacitance at each side: Trim Capacitance = Ct =
(2*CL-(Cb + Cd))
CL: Crystal load capacitance. Defined by manufacturer
Ct: External trim capacitors. (Trimmed CL Load
capacitance to get the right ppm)
Cb: Board capacitance (vias, traces, etc.)
Cd: Internal capacitance of the device (lead frame, bond
wires, pin, etc.)
Equivalent Series
Resistance (ESR)
Max.
Cut
Load
Cap.
Shunt
Cap.
Max.
Drive
Max.
50
AT
18pF
7pF
0.1m
W
Crystal Input Interface
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