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參數(shù)資料
型號: SM840021KA
廠商: Micrel Inc
文件頁數(shù): 9/10頁
文件大?。?/td> 0K
描述: IC CLOCK SYNTHESIZER 8TSSOP
產(chǎn)品培訓模塊: High Bandwidth Product Overview
標準包裝: 150
系列: RotaryWave™
類型: 時鐘/頻率合成器
PLL:
輸入: 晶體
輸出: LVCMOS
電路數(shù): 1
比率 - 輸入:輸出: 1:1
差分 - 輸入:輸出: 無/無
頻率 - 最大: 125MHz
除法器/乘法器: 是/無
電源電壓: 2.375 V ~ 3.465 V
工作溫度: -40°C ~ 75°C
安裝類型: 表面貼裝
封裝/外殼: 8-TSSOP(0.173",4.40mm 寬)
供應商設(shè)備封裝: 8-TSSOP
包裝: 管件
其它名稱: 576-3696-5
SM840021KA-ND
Micrel, Inc.
SM840021
March 2010
8
M9999-031810-B
hbwhelp@micrel.com or (408) 955-1690
Power Supply Filtering
The SM840021 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 3.3 V and 2.5 V
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.
70
AT
7pF
0.1mW
Crystal Input Interface
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