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| 型号： | SI5338E-A-GM |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 11/44页 |
| 文件大小： | 0K |
| 描述： | IC CLK GEN I2C BUS PROG 24QFN |
| 标准包装： | 490 |
| 系列： | MultiSynth™ |
| 类型： | * |
| PLL： | 是 |
| 输入： | CML，HCSL，HSCL，LVDS，LVPECL，晶体 |
| 输出： | CMOS，HCSL. HSTL. LVDS. LVPECL. SSTL |
| 电路数： | 1 |
| 比率 - 输入:输出： | 1:4 |
| 差分 - 输入:输出： | 是/是 |
| 频率 - 最大： | 350MHz |
| 除法器/乘法器： | 是/是 |
| 电源电压： | 1.71 V ~ 3.63 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-VFQFN 裸露焊盘 |
| 供应商设备封装： | 24-QFN（4x4） |
| 包装： | 托盘 |
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Si5338
Rev. 1.3
19
Synthesis of the output clocks is performed in two
stages, as shown in Figure 5. The first stage consists of
a high-frequency analog phase-locked loop (PLL) that
multiplies the input stage to a frequency within the
range of 2.2 to 2.84 GHz. Multiplication of the input
frequency is accomplished using a proprietary and
highly precise MultiSynth feedback divider (N), which
allows the PLL to generate any frequency within its
VCO range with much less jitter than typical fractional N
PLL.
Figure 5. Synthesis Stages
The second stage of synthesis consists of the output
MultiSynth dividers (MSx). Based on a fractional N
divider, the MultiSynth divider shown in Figure 6
switches seamlessly between the two closest integer
divider values to produce the exact output clock
frequency with 0 ppm error.
To eliminate phase error generated by this process, the
MultiSynth block calculates the relative phase difference
between the clock produced by the fractional-N divider
and the desired output clock and dynamically adjusts
the phase to match the ideal clock waveform. This novel
approach makes it possible to generate any output
clock frequency without sacrificing jitter performance.
This architecture allows the output of each MultiSynth to
produce any frequency from 5 to Fvco/8 MHz. To
support higher frequency operation, the MultiSynth
divider can be bypassed. In bypass mode, integer divide
ratios of 4 and 6 are supported. This allows for output
frequencies of Fvco/4 and Fvco/6 MHz, which translates
to 367–473.33 MHz and 550–710 MHz respectively.
Because each MultiSynth uses the same VCO output,
there are output frequency limitations when output
frequencies greater than Fvco/8 are desired.
For example, if 375 MHz is needed at the output of
MultiSynth0, the VCO frequency would need to be
2.25 GHz. Now, all the other MultiSynths can produce
any frequency from 5 MHz up to a maximum frequency
of 2250/8 = 281.25 MHz. MultiSynth1,2,3 could also
produce Fvco/4 = 562.5 MHz or Fvco/6 = 375 MHz. Only
two unique frequencies above Fvco/8 can be output:
Fvco/6 and Fvco/4.
Figure 6. Silicon Labs’ MultiSynth Technology
Phase
Frequency
Detector
Loop
Filter
VCO
MultiSynth
÷MS0
MultiSynth
÷MS1
MultiSynth
÷MS2
MultiSynth
÷MS3
MultiSynth
÷N
Synthesis
Stage 1
(APLL)
Synthesis
Stage 2
ref
fb
From
Input
Stage
T
o
Output
S
tage
2.2-2.84 GHz
Fractional-N
Divider
Phase
Adjust
Phase Error
Calculator
Divider Select
(DIV1, DIV2)
fVCO
fOUT
MultiSynth
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SI5338E-A-GMR | 功能描述:时钟发生器及支持产品 I2C-Program Clk Gen 0.16-350MHz Pin-Ctrl RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
| Si5338E-B-GM | 功能描述:时钟发生器及支持产品 I2C-PRGRMBL clock generatr 0.16-350MHz RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
| Si5338E-B-GMR | 功能描述:时钟发生器及支持产品 I2C-Program Clk Gen 0.16-350MHz Pin-Ctrl RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
| Si5338-EVB | 功能描述:时钟和定时器开发工具 Si5338/4/0 eval board RoHS:否 制造商:Texas Instruments 产品:Evaluation Modules 类型:Clock Conditioners 工具用于评估:LMK04100B 频率:122.8 MHz 工作电源电压:3.3 V |
| SI5338F-A01839-GM | 制造商:Silicon Laboratories Inc 功能描述:CLOCK - Bulk |
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