hbwhelp@micrel.com or (408) 955-1690 Total capacitance " />
參數(shù)資料
型號(hào): SM840051KA
廠商: Micrel Inc
文件頁數(shù): 9/10頁
文件大?。?/td> 0K
描述: IC CLK SYNTHESIZER 10G 8TSSOP
產(chǎn)品培訓(xùn)模塊: High Bandwidth Product Overview
特色產(chǎn)品: SM840051 Clock Synthesizer
標(biāo)準(zhǔn)包裝: 150
系列: RotaryWave™
類型: 時(shí)鐘/頻率合成器
PLL:
輸入: 晶體
輸出: LVCMOS,LVTTL
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: 162.4MHz
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(yīng)商設(shè)備封裝: 8-TSSOP
包裝: 管件
其它名稱: 576-3622-5
Micrel, Inc.
SM840051
May 2010
8
M9999-050710-C
hbwhelp@micrel.com or (408) 955-1690
Total capacitance seen by crystal = CL =
1
+
1
(Ct1 + Cb1 + Cd1)
(Ct2 + Cb2 + Cd2)
Example:
CL = 18pF, Cb = 2pF, Cd = 4pF
Trim Cap = Ct = 2 (18pF) - (2pF +4pF) = 30pF
The SM840051 has been characterized with 19.44MHz,
18pF parallel resonant crystal. The trim capacitors Ct1 and
Ct2 were optimized to minimize the ppm error.
To minimize the board capacitance, a short trace from pin
to crystal footprint without vias is desirable. It is preferable
to have ground shielding or distance between the crystal
traces and noisy signals on the board.
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