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參數(shù)資料
| 型號： | 514ECCXXXXXXAAGR |
| 廠商： | SILICON LABORATORIES |
| 元件分類： | XO, clock |
| 英文描述： | 125 MHz, OTHER CLOCK GENERATOR, PDSO6 |
| 封裝： | 5 X 7 MM, ROHS COMPILANT PACKAGE-6 |
| 文件頁數(shù)： | 32/32頁 |
| 文件大?。?/td> | 267K |
| 代理商： | 514ECCXXXXXXAAGR |
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Si514
Preliminary Rev. 0.9
9
2. Functional Description
The Si514 offers system designers a programmable, low jitter XO solution with exceptionally fine frequency tuning
resolution. To enable designers to take full advantage of this flexibility and performance, Silicon Laboratories
provides an easy-to-use evaluation kit and intuitive suite of Windows-based software utilities to simplify the Si514
programming process.
The Si5xx-PROG-EVB kit contains the Programmable Oscillator Software suite and an EVB Driver (USBXpress)
for use with USB-equipped PCs. Go to
http://www.silabs.com/products/clocksoscillators/Pages/DevelopmentTools.aspx
for more information.
Alternatively, section 2.1 provides designers a detailed description, along with examples, of the frequency
programming requirements and process for designers who are interested in learning more about the programming
algorithms implemented within the Programmable Oscillator Software suite.
2.1. Programming a New Output Frequency
The output frequency (Fout) is determined by programming the feedback multiplier (M=M_Int.M_Frac), High-
Speed Divider (HS_DIV), and Low-Speed Divider (LS_DIV) according to the following formula:
Figure 1. Block Diagram of Si514
The value of the feedback multiplier M is adjustable in the following range:
65.04065041
M 78.17385866.
This keeps the VCO frequency within the range of 2080 MHz FVCO 2500 MHz, since the VCO frequency is the
product of the internal fixed-frequency crystal (FXO) and the high-resolution 29-bit fractional multiplier (M). This 29-
bit resolution of M allows the VCO frequency to have a frequency tuning resolution of 0.026 ppb.
The device comes from the factory with a pre-programmed center frequency within the range of
100 kHz FOUT 250 MHz, as specified by the 6-digit code in the part number. (See section “6. Ordering
Information” for more information.) To change from the factory-programmed frequency to a different value, the user
must follow one of two algorithms based on the magnitude of the frequency change.
“Small Frequency Change.” To change the frequency by < ±1000 ppm, the user must keep the same center
frequency and only update the value of M. Refer to section "2.2. Programming a Small Frequency Change (sub
“Large Frequency Change.” To change the frequency by
±1000 ppm, the user must change the center
frequency. This may require updates to the output dividers (HS_DIV and/or LS_DIV) and possibly the LP1 and
Fout
FXO M
HS_DIV LS_DIV
--------------------------------------------------
where FXO 31.98MHz
=
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| 514KCAXXXXXXBAGR | 250 MHz, OTHER CLOCK GENERATOR, PDSO6 |
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| 5962-9162303MXC | GRAPHICS PROCESSOR, CPGA145 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 514F | 功能描述:風(fēng)扇 50x15mm 24VDC 12CFM 1W 5000RPM 30dBA SB RoHS:否 制造商:Sanyo Denki 產(chǎn)品:Fans 電流類型: 電源電壓:48 V 氣流:636 CFM 軸承類型: 噪聲:83 dBA 速度:6400 RPM 功率額定值:264 W 框架尺寸 (mm):172 mm x 150 mm x 102 mm 外殼材料:Aluminum 端接類型:Wire 系列: |
| 514F | 制造商:ebm-papst Inc 功能描述:FAN 50MM 24VDC |
| 514F | 制造商:ebm-papst Inc 功能描述:Axial Fan |
| 514FAA000115BAG | 功能描述:100kHz ~ 250MHz LVDS XO (Standard) Programmable Oscillator Surface Mount 2.5V 23mA Enable/Disable 制造商:silicon labs 系列:Si514 包裝:托盤 零件狀態(tài):有效 類型:XO（標(biāo)準(zhǔn)） 可編程類型:空白（須由用戶啟用程序） 可用頻率范圍:100kHz ~ 250MHz 功能:啟用/禁用 輸出:LVDS 電壓 - 電源:2.5V 頻率穩(wěn)定度:±50ppm 頻率穩(wěn)定性（總體）:±100ppm 工作溫度:-40°C ~ 85°C 擴(kuò)頻帶寬:- 電流 - 電源（最大值）:23mA 等級:- 安裝類型:表面貼裝 封裝/外殼:6-SMD，無引線（DFN，LCC） 大小/尺寸:0.197" 長 x 0.126" 寬（5.00mm x 3.20mm） 高度:0.050"（1.28mm） 電流 - 電源（禁用）（最大值）:18mA 標(biāo)準(zhǔn)包裝:50 |
| 514FBA000159AAG | 制造商:Silicon Laboratories Inc 功能描述:OSCILLATOR - Trays |
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