參數(shù)資料
型號(hào)： SI5350C-AXXXXX-GU
廠商： SILICON LABORATORIES
元件分類： 時(shí)鐘產(chǎn)生/分配
英文描述： 133 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO24
封裝： MO-137C, QSOP-24
文件頁(yè)數(shù)： 2/22頁(yè)
文件大小： 244K
代理商： SI5350C-AXXXXX-GU
Si5350C
10
Rev. 0.2
4. Configuring the Si5350C
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. Samples of any custom Si5350C
factory-programmed clock generator are available with short lead times.
4.1. Crystal Inputs (XA, XB)
The Si5350C uses an optional fixed-frequency non-pullable standard AT-cut crystal as a reference to generate
free-running output clocks. Note that a XTAL is not required for generating synchronous clocks that are locked to
CLKIN.
4.1.1. Crystal Frequency
The Si5350C 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 Si5350C. 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. External Clock Input Pin (CLKIN)
The external clock input is used as a reference for generating synchronous clocks. The input frequency can be
specified from 10 to 100 MHz including fractional frequencies (e.g., 74.25 MHz x 1000/1001). The ClockBuilder
utility automatically determines the exact synthesis ratio to guarantee an output frequency with 0 ppm error with
respect to its reference.
4.3. Output Clocks (CLK0–CLK7)
The Si5350C 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 “4.4.2. Frequency Select (FS_0, FS_1)” for more details on the operation of the
frequency select pins. Each output clock can select its reference for either of the PLLs.
4.3.1. 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.
4.3.2. .Spread Spectrum
Spread spectrum can be enabled on any of the clock outputs that use PLL_B as its reference. 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 Si5350C supports several levels of spread spectrum allowing the designer to chose an ideal compromise
XA
XB
Optional internal
load capacitors
6pF, 8pF, 10pF
CL
Optional external
load capacitors
CL
相關(guān)PDF資料
PDF描述
SI5356AAXXXXXGM 200 MHz, PROC SPECIFIC CLOCK GENERATOR, QCC24
SI5356A-AXXXXX-GMR 200 MHz, PROC SPECIFIC CLOCK GENERATOR, QCC24
SI5369B-C-GQR 808 MHz, PROC SPECIFIC CLOCK GENERATOR, PQFP100
SI5369B-C-GQ 808 MHz, PROC SPECIFIC CLOCK GENERATOR, PQFP100
SI5369C-C-GQ 346 MHz, PROC SPECIFIC CLOCK GENERATOR, PQFP100
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SI5350C-B02166-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-B02516-GT 制造商:Silicon Laboratories Inc 功能描述:ANY-RATE, DUAL PLL 160MHZ CLOCK WITH DUAL INPUT, 3 OUTPUTS, - Rail/Tube
SI5350C-B02569-GT 制造商:Silicon Laboratories Inc 功能描述:CONFIGURABLE CLOCK GENERATOR - Rail/Tube
SI5350C-B02570-GT 制造商:Silicon Laboratories Inc 功能描述:CONFIGURABLE CLOCK GENERATOR - Rail/Tube
Si5350C-Bxxxxx-GM 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 Any-Rate, Dual PLL 160 MHz Clock with Dual Input, 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
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