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| 型号： | SI51211-A01AFM |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC CLK GEN FACTORY CONFIG 8TDFN |
| 标准包装： | 100 |
| 类型： | * |
| PLL： | 带旁路 |
| 输入： | 时钟，晶体 |
| 输出： | CMOS |
| 电路数： | 1 |
| 比率 - 输入:输出： | 1:3 |
| 差分 - 输入:输出： | 无/无 |
| 频率 - 最大： | 200MHz |
| 除法器/乘法器： | 是/无 |
| 电源电压： | 2.375 V ~ 3.63 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 供应商设备封装： | 8-TDFN（1.4x1.6） |
| 包装： | 管件 |
Si51211
Preliminary Rev. 0.7
7
3. Functional Description
3.1. Input Frequency Range
The input frequency range is from 8.0 to 48.0 MHz for crystals and ceramic resonators. If an external clock is used,
the input frequency range is from 8.0 to 166.0 MHz.
3.2. Output Frequency Range and Outputs
Up to three outputs can be programmed as SSCLK or REFCLK. SSCLK output can be synthesized to any value
from 3 to 200 MHz with spread based on valid input frequency. The spread at SSCLK pins can be stopped by the
SSON input control pin. If SSON pin is high (VDD), the frequency at SSCLK pin is synthesized to the nominal value
of the input frequency and there is no spread.
REFCLK is the buffered output of the oscillator and is the same frequency as the input frequency without spread.
However, REFCLK_D output is divided by output dividers from 2 to 32. By using only low cost, fundamental mode
crystals, the Si51211 can synthesize output frequency up to 200 MHz, eliminating the need for higher order
crystals (Xtals) and crystal oscillators (XOs). This reduces the cost while improving the system clock accuracy,
performance, and reliability.
3.3. Programmable Modulation Frequency
The spread spectrum clock (SSC) modulation default value is 31.5 kHz. The higher values of up to 62 kHz can also
be programmed. Less than 30 kHz modulation frequency is not recommended to stay out of the range audio
frequency bandwidth since this frequency could be detected as a noise by the audio receivers within the vicinity.
3.4. Programmable Spread Percent (%)
The spread percent (%) value is programmable from ±0.25% to ±1% (center spread) for all SSCLK frequencies. It
is possible to program smaller or larger non-standard values of spread percentage. Contact Silicon Labs if these
non-standard spread percent values are required in the application.
3.5. SSON or Frequency Select (FSEL)
The Si51211 pin 4 and 6 can be programmed as either SSON to enable or disable the programmed spread percent
value or as frequency select (FSEL). If SSON is used, when this pin is pulled high (VDD), the spread is stopped
and the frequency is the nominal value without spread. If low (GND), the frequency is the nominal value with the
spread.
If FSEL function is used, the output pins can be programmed for different set of frequencies as selected by FSEL.
SSCLK value can be any frequency from 3 to 200 MHz, but the spread % is the same percent value. REFCLK is
the same frequency as the input reference clock and the REFCLK_D input clock is divided by 2 to 32 without
spread. The set of frequencies in Table 4 is given as an example, using a 48 MHz crystal.
3.6. Power Down (PD) or Output Enable (OE)
The Si51211 pin 6 can be programmed as PD input. Pin 4 and pin 6 can be programmed as OE input. PD turns off
both PLL and output buffers whereas OE only disables the output buffers to Hi-Z.
Table 4. Example Frequencies
FSEL
(Pin 6)
SSCLK1
(Pin 4)
066 MHz, ±1%
133 MHz, ±1%
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| Si51211-A01AFMR | 功能描述:时钟发生器及支持产品 8 TDFN micro-Clock fact config clk gen 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 |
| SI51211-A19AFM | 制造商:Silicon Laboratories Inc 功能描述:8 TDFN MICRO-CLOCK, FACTORY CONFIGURABLE CLOCK GENERATOR - Bulk |
| SI51211-EVB | 功能描述:Si51210, Si51211, Si51214 - Timing, Clock Generator Evaluation Board 制造商:silicon labs 系列:- 零件状态:有效 主要用途:计时，时钟发生器 嵌入式:- 使用的 IC/零件:Si51210，Si51211，Si51214 主要属性:- 辅助属性:- 所含物品:板 标准包装:1 |
| Si51214-A01AFM | 功能描述:时钟发生器及支持产品 1.8v 6TDFN Clockgen SL Clock 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 |
| Si51214-A01AFMR | 功能描述:时钟发生器及支持产品 1.8V, 6 TDFN micro- Clk, fact config gen 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 |
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