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參數(shù)資料
| 型號： | SI51219-A01AFT |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CLK GEN FACTORY CONFIG 8TSSOP |
| 標準包裝： | 100 |
| 類型： | * |
| PLL： | 帶旁路 |
| 輸入： | 時鐘，晶體 |
| 輸出： | CMOS |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 1:3 |
| 差分 - 輸入:輸出： | 無/無 |
| 頻率 - 最大： | 200MHz |
| 除法器/乘法器： | 是/無 |
| 電源電壓： | 2.375 V ~ 3.63 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP（0.173"，4.40mm 寬） |
| 供應商設備封裝： | 8-TSSOP |
| 包裝： | 管件 |
Si51219
Preliminary Rev. 0.7
7
3. Functional Descriptions
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 Si51219 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 Si51219 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 Si51219 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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相關代理商/技術參數(shù) |
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|---|---|
| Si51219-A01AFTR | 功能描述:時鐘發(fā)生器及支持產(chǎn)品 8 TSSOP micro-Clock fact config clk gen 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-56 |
| SI51219-A14AFT | 制造商:Silicon Laboratories Inc 功能描述:8 TSSOP MICRO-CLOCK - Bulk |
| SI51219-A14BFT | 制造商:Silicon Laboratories Inc 功能描述:8 TSSOP MICRO-CLOCK, FACTORY CONFIGURABLE CLOCK GENERATOR - Bulk |
| Si514-PROG-EVB | 功能描述:時鐘和定時器開發(fā)工具 Si514 EVAL Board RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Modules 類型:Clock Conditioners 工具用于評估:LMK04100B 頻率:122.8 MHz 工作電源電壓:3.3 V |
| SI-5151S | 制造商:SANKEN 制造商全稱:Sanken electric 功能描述:High-side Power Switch with Diagnostic Function |
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