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參數(shù)資料
| 型號(hào)： | SI5351B-A-GT |
| 廠商： | Silicon Laboratories Inc |
| 文件頁(yè)數(shù)： | 3/72頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC CLK GEN PLL BLANK CUST 10MSOP |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 系列： | MultiSynth™ |
| 類型： | * |
| PLL： | 是 |
| 輸入： | 晶體 |
| 輸出： | CMOS |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 1:8 |
| 差分 - 輸入:輸出： | 無(wú)/無(wú) |
| 頻率 - 最大： | 133MHz |
| 除法器/乘法器： | 是/無(wú) |
| 電源電壓： | 2.25 V ~ 3.63 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 10-MSOP |
| 包裝： | 管件 |
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Si5351A/B/C
Preliminary Rev. 0.95
11
3. Functional Description
The Si5351 is a versatile I2C programmable clock generator that is ideally suited for replacing crystals, crystal
oscillators, VCXOs, PLLs, and buffers. A block diagram showing the general architecture of the Si5351 is shown in
Figure 3. The device consists of an input stage, two synthesis stages, and an output stage.
The input stage accepts an external crystal (XTAL), a clock input (CLKIN), or a control voltage input (VC)
depending on the version of the device (A/B/C). The first stage of synthesis multiplies the input frequencies to an
high-frequency intermediate clock, while the second stage of synthesis uses high resolution MultiSynth fractional
dividers to generate the desired output frequencies. Additional integer division is provided at the output stage for
generating output frequencies as low as 8 kHz. Crosspoint switches at each of the synthesis stages allows total
flexibility in routing any of the inputs to any of the outputs.
Because of this high resolution and flexible synthesis architecture, the Si5351 is capable of generating
synchronous or free-running non-integer related clock frequencies at each of its outputs, enabling one device to
synthesize clocks for multiple clock domains in a design.
Figure 3. Si5351 Block Diagram
3.1. Input Stage
3.1.1. Crystal Inputs (XA, XB)
The Si5351 uses a fixed-frequency standard AT-cut crystal as a reference to the internal oscillator. The output of
the oscillator can be used to provide a free-running reference to one or both of the PLLs for generating
asynchronous clocks. The output frequency of the oscillator will operate at the crystal frequency, either 25 MHz or
27 MHz. The crystal is also used as a reference to the VCXO to help maintain its frequency accuracy.
Internal load capacitors (CL) are provided to eliminate the need for external components when connecting a crystal
to the Si5351. Options for internal load capacitors are 6, 8, or 10 pF. Crystals with alternate load capacitance
requirements are supported using additional external load capacitors as shown in Figure 4. Refer to application
note AN551 for crystal recommendations.
Figure 4. External XTAL with Optional Load Capacitors
Input
Stage
Synthesis
Stage 1
PLL B
(VCXO)
PLL A
(SSC)
VC
VCXO
XA
XB
OSC
XTAL
CLKIN
Div
Multi
Synth
0
Multi
Synth
1
Multi
Synth
2
Multi
Synth
3
Multi
Synth
4
Multi
Synth
5
Multi
Synth
6
Multi
Synth
7
Synthesis
Stage 2
R0
R1
R2
R3
R4
R5
R6
R7
Output
Stage
CLK0
CLK1
VDDOA
CLK2
CLK3
VDDOB
CLK4
CLK5
VDDOC
CLK6
CLK7
VDDOD
XA
XB
Selectable internal
load capacitors
6 pF, 8 pF, 10 pF
CL
Optional
Additional external
load capacitors
(< 2 pF)
CL
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| Si5351B-A-GU | 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 AnyRate 2 PLL 125MHz Clk w/VCXO&I2C 8out 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 |
| SI5351B-A-GUR | 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 Dual PLL 133MHz Clk VCXO and I2C 8 Outs 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 |
| Si5351B-Axxxxx-GM | 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 Any-Rate, Dual PLL 133MHz Clock with VCXO and I2C, 8 outputs, 20-QFN (customized) 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 |
| Si5351B-Axxxxx-GU | 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 Any-Rate, Dual PLL 133MHz Clock with VCXO and I2C, 8 outputs, 24-QSOP (customized) 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 |
| SI5351B-B01556-GM | 制造商:Silicon Laboratories Inc 功能描述:CLOCK - Trays |
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