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參數(shù)資料
| 型號： | SL28SRC02BZI |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 13/14頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CLOCK PCIE GEN3/2 DIF 20TSSOP |
| 標(biāo)準(zhǔn)包裝： | 75 |
| 類型： | * |
| PLL： | 是 |
| 輸入： | 時鐘，晶體 |
| 輸出： | 時鐘 |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 1:2 |
| 差分 - 輸入:輸出： | 無/是 |
| 頻率 - 最大： | 100MHz |
| 除法器/乘法器： | 無/無 |
| 電源電壓： | 3.135 V ~ 3.465 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | * |
| 封裝/外殼： | * |
| 供應(yīng)商設(shè)備封裝： | * |
| 包裝： | * |
SL28SRC02
............................................... Document #: 0.2 Page 8 of 14
The SL28SRC02 requires a Parallel Resonance Crystal.
Substituting a series resonance crystal causes the
SL28SRC02 to operate at the wrong frequency and violates
the ppm specification. For most applications there is a
300-ppm frequency shift between series and parallel crystals
due to incorrect loading
Crystal Loading
Crystal loading plays a critical role in achieving low ppm perfor-
mance. To realize low ppm performance, use the total capac-
itance the crystal sees to calculate the appropriate capacitive
loading (CL).
shows a typical crystal configuration using the two
trim capacitors. It is important that the trim capacitors are in
series with the crystal. It is not true that load capacitors are in
parallel with the crystal and are approximately equal to the
load capacitance of the crystal.
Calculating Load Capacitors
In addition to the standard external trim capacitors, consider
the trace capacitance and pin capacitance to calculate the
crystal loading correctly. Again, the capacitance on each side
is in series with the crystal. The total capacitance on both side
is twice the specified crystal load capacitance (CL). Trim
capacitors are calculated to provide equal capacitive loading
on both sides.
,
Use the following formulas to calculate the trim capacitor
values for Ce1 and Ce2.
CL....................................................Crystal load capacitance
CLe......................................... Actual loading seen by crystal
using standard value trim capacitors
Ce..................................................... External trim capacitors
Cs..............................................Stray capacitance (terraced)
Ci ...........................................................Internal capacitance
(lead frame, bond wires, etc.)
Table 4. Crystal Recommendations
Frequency
(Fund)
Cut
Loading
Load Cap
Drive
(max.)
Shunt Cap
(max.)
Motional
(max.)
Tolerance
(max.)
Stability
(max.)
Aging
(max.)
14.31818 MHz
AT
Parallel
20 pF
0.1 mW
5 pF
0.016 pF
35 ppm
30 ppm
5 ppm
Figure 1. Crystal Capacitive Clarification
XTAL
Ce 2
Ce 1
Cs 1
Cs 2
X1
X2
Ci1
Ci2
Clo c k Ch ip
Tra c e
2.8pF
Trim
33pF
Pin
3 to 6p
Figure 2. Crystal Loading Example
F
Load Capacitance (each side)
Total Capacitance (as seen by the crystal)
Ce = 2 * CL - (Cs + Ci)
Ce1 + Cs1 + Ci1
1
+
Ce2 + Cs2 + Ci2
1
(
)
1
=
CLe
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SL28SRC02BZIT | 功能描述:時鐘發(fā)生器及支持產(chǎn)品 PCIE Clk Gen Xin 14M -->4 PCIE out Gen3 RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
| SL28SRC02BZITR | 制造商:Silicon Laboratories Inc 功能描述: |
| SL28SRC04BZC | 功能描述:時鐘發(fā)生器及支持產(chǎn)品 PCIE Clk Gen 14.318M Xin 4PCIE out Gen3 RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
| SL28SRC04BZCT | 功能描述:時鐘發(fā)生器及支持產(chǎn)品 PCIE Clk Gen 14.318M Xin 4PCIE out Gen3 RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
| SL28SRC04BZI | 功能描述:時鐘發(fā)生器及支持產(chǎn)品 PCIE Clk Gen 14.318M Xin 2PCIE out Gen3 RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
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