hbwhelp@micrel.com or (408) 955-1690 Power Supply Fil" />
參數資料
型號: SM840021KA TR
廠商: Micrel Inc
文件頁數: 9/10頁
文件大?。?/td> 0K
描述: IC CLOCK SYNTHESIZER 8TSSOP
產品培訓模塊: High Bandwidth Product Overview
標準包裝: 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: 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)
供應商設備封裝: 8-TSSOP
包裝: 帶卷 (TR)
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
相關PDF資料
PDF描述
X9408WS24IT1 IC XDCP QUAD 64-TAP 10K 24-SOIC
VE-2T4-MW-S CONVERTER MOD DC/DC 48V 100W
VE-2TF-IV CONVERTER MOD DC/DC 72V 150W
X9408WS24I-2.7T1 IC XDCP QUAD 64-TAP 10K 24-SOIC
SY100EP140LZG TR IC FREQUENCY DETECTOR 3.3V 8SOIC
相關代理商/技術參數
參數描述
SM840051 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:10 Gigabit Ethernet Ultra-Low Jitter Clock Synthesizer
SM840051KA 功能描述:時鐘合成器/抖動清除器 77, 78, 155, 156 MHz Ultra Low Clock Synthesizer RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel
SM840051KA TR 功能描述:時鐘合成器/抖動清除器 77, 78, 155, 156 MHz Ultra Low Clock Synthesizer RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel
SM840051KATR 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:10 Gigabit Ethernet Ultra-Low Jitter Clock Synthesizer
SM840B 制造商:SECOS 制造商全稱:SeCoS Halbleitertechnologie GmbH 功能描述:8.0 AMP Surface Mount Schottky Barrier Rectifiers