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參數(shù)資料
| 型號： | SI5350B-AXXXXX-GT |
| 廠商： | SILICON LABORATORIES |
| 元件分類： | 時鐘產(chǎn)生/分配 |
| 英文描述： | 133 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO10 |
| 封裝： | MO-137C, MSOP-10 |
| 文件頁數(shù)： | 2/22頁 |
| 文件大小： | 249K |
| 代理商： | SI5350B-AXXXXX-GT |
Si5350B
10
Rev. 0.2
4. Configuring the Si5350B
based utility (www.silabs.com/ClockBuilder). The ClockBuilder utility provides a simple graphical interface that
allows the user to enter input and output frequencies along with other custom features as described in the following
sections. All synthesis calculations are automatically performed by ClockBuilder to ensure an optimum
configuration. A unique part number is assigned to each custom configuration.
4.1. Crystal Inputs (XA, XB)
The Si5350B uses a fixed-frequency non-pullable standard AT-cut crystal as a reference to synthesize its output
clocks and to provide the frequency stability for the VCXO.
4.1.1. Crystal Frequency
The Si5350B can operate using either a 25 MHz or a 27 MHz crystal.
4.1.2. Internal XTAL Load Capacitors
Internal load capacitors (CL) are provided to eliminate the need for external components when connecting a XTAL
to the Si5350B. Options for internal load capacitors are 6, 8, or 10 pF, or no internal load capacitors. XTALs with
alternate load capacitance requirements are supported using external load capacitors as shown in Figure 3.
Figure 3. External XTAL with Optional Load Capacitors
4.2. Output Clocks (CLK0–CLK7)
The Si5350B is orderable as a 3-output (10-MSOP) or 8-output (24-QSOP, 20-QFN) clock generator. Output clocks
CLK0 to CLK5 can be ordered with two clock frequencies (F1_x, F2_x) which are selectable with the optional
frequency select pins (FS0/1). See “4.3.2. Frequency Select (FS_0, FS_1)” for more details on the operation of the
frequency select pins. Each output clock can select its reference either from the PLL or from the VCXO.
4.2.1. Output Clock Frequency
Outputs can be configured at any frequency from 8 kHz up to 100 MHz. In addition, the device can generate any
two non-integer related frequencies up to 125 MHz.
4.2.2. .Spread Spectrum
Spread spectrum can be enabled on any of the clock outputs that use the PLL as its reference. Spread spectrum is
not available on clocks synchronized to the VCXO. Spread spectrum is useful for reducing electromagnetic
interference (EMI). Enabling spread spectrum on an output clock modulates its frequency, which effectively
reduces the overall amplitude of its radiated energy. Up to –15 dB reduction in EMI is possible.
The Si5350B supports several levels of spread spectrum allowing the designer to chose an ideal compromise
between system performance and EMI compliance. The amount of spread is configurable within the following
parameters:
Down spread: –0.5 to –2.5% modulation amplitude
An optional spread spectrum enable pin (SSEN) is configurable to enable or disable the spread spectrum feature.
See “4.3.1. Spread Spectrum Enable (SSEN)” for details.
XA
XB
Optional internal
load capacitors
6pF, 8pF, 10pF
CL
Optional external
load capacitors
CL
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| Si5350B-Axxxxx-GU | 功能描述:時鐘發(fā)生器及支持產(chǎn)品 Any-Rate, Dual PLL 133MHz Clock with VCXO , 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 |
| Si5350B-Bxxxxx-GM | 功能描述:時鐘發(fā)生器及支持產(chǎn)品 Any-Rate, Dual PLL 160 MHz Clock with VCXO , 8 outputs with 50? output impedance, 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 |
| Si5350B-Bxxxxx-GT | 功能描述:時鐘發(fā)生器及支持產(chǎn)品 Any-Rate, Dual PLL 160 MHz Clock with VCXO , 3 outputs with 50? output impedance, 10-MSOP (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 |
| SI5350C-A01030-GT | 制造商:Silicon Laboratories Inc 功能描述:ANY-RATE, DUAL PLL 125MHZ CLOCK WITH DUAL INPUT, 3 OUTPUTS, - Rail/Tube |
| SI5350C-A01237-GT | 制造商:Silicon Laboratories Inc 功能描述:ANY-RATE, DUAL PLL 125MHZ CLOCK WITH DUAL INPUT, 3 OUTPUTS, - Rail/Tube |
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