hbwhelp@micrel.com or (408) 955-1690 Total capacitanc" />
參數(shù)資料
型號: SM840021KA TR
廠商: Micrel Inc
文件頁數(shù): 10/10頁
文件大小: 0K
描述: IC CLOCK SYNTHESIZER 8TSSOP
產(chǎn)品培訓(xùn)模塊: High Bandwidth Product Overview
標(biāo)準(zhǔn)包裝: 1,000
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(yīng)商設(shè)備封裝: 8-TSSOP
包裝: 帶卷 (TR)
Micrel, Inc.
SM840021
March 2010
9
M9999-031810-B
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 SM840021 has been characterized with 25MHz,
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.
Board Layout
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