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參數(shù)資料
| 型號(hào)： | SM840051KA TR |
| 廠商： | Micrel Inc |
| 文件頁(yè)數(shù)： | 8/10頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC CLK SYNTHESIZER 10G 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(lèi)型： | 時(shí)鐘/頻率合成器 |
| PLL： | 是 |
| 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(wú)/無(wú) |
| 頻率 - 最大： | 162.4MHz |
| 除法器/乘法器： | 是/無(wú) |
| 電源電壓： | 2.375 V ~ 3.465 V |
| 工作溫度： | -40°C ~ 75°C |
| 安裝類(lèi)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.
SM840051
May 2010
7
M9999-050710-C
hbwhelp@micrel.com or (408) 955-1690
Power Supply Filtering
The SM840051 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. Power Supply Filter
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 the crystal
will see must be considered to calculate the 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
0.1mW
Crystal Input Interface
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