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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)： | 3/32頁 |
| 文件大?。?/td> | 267K |
| 代理商： | 514ECCXXXXXXAAGR |
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Si514
Preliminary Rev. 0.9
11
e. Register 9 = 0x09 (M_Int[8:3])
f. M_Int = 0b001001010 = 0x4A = 0d74
g. M_Frac = 0x097C65D3 = 159,147,475
h. M= M_Int + M_Frac/229 = 74 + 159,147,475/229 = 74.296435272321105
2. Calculate Mnew:
a. Mnew = 74.296435272321105 x 148.352/148.5 = 74.2223889933965
b. M_Intnew = 74 = 0x4A
c. M_Fracnew = 0.2223889933965 x 229 = 119,394,181 = 0x071DCF85
3. Write Mnew to Registers 5-7:
a. Register 5 = 0x85
b. Register 6 = 0xCF
c. Register 7 = 0x1D
4. Write Mnew to Register 8:
a. Register 8 = 0x47
5. Write Mnew to Register 9:
a. Register 9 = 0x09
2.3. Programming a Large Frequency Change (> ±1000 ppm)
Large frequency changes are those that vary the FVCO frequency by an amount greater than ±1000 ppm from an
operating FCENTER. Figure 2 illustrates the difference between large and small frequency changes. Changing from
FCENTER to F'CENTER requires a calibration cycle that resets internal circuitry to establish F'CENTER as the new
operating center frequency. The below steps are recommended when performing large frequency changes:
1. Disable the output: Write OE register bit to a 0 (Register 132, bit2)
2. If using one of the standard frequencies listed in Table 9, then write the new LP1, LP2, M_Frac, M_Int, HS_DIV
and LS_DIV register values according to the table (be sure to write M_Int[8:3] (Register 9) after writing to the
M_Frac registers (Registers 5-8)). Skip to Step 9. If the desired frequency is not in the table, then follow steps
4-8 below.
3. Determine the minimum value of LS_DIV (minimizing LS_DIV minimizes the number of dividers on the output
stage, thus minimizing jitter) according to the following formula:
a. LS_DIV = FVCO(MIN)/(FOUT x HS_DIV(MAX)) (Eq 2.6)
b. LS_DIV = 2080/(FOUT(MHz) x 1022) (Eq 2.7)
i. Since LS_DIV is restricted to: dividing by 1,2,4,8,16,32, choose the next largest value over the
result derived in Eq 2.7 (e.g., if result is 4.135, choose LS_DIV = 8)
4. Determine the minimum value for HS_DIV (this optimizes timing margins)
a. HS_DIV(MIN) = FVCO(MIN)/(FOUT x LS_DIV) (Eq 2.8)
b. HS_DIV(MIN) = 2080/(FOUT(MHz) x LS_DIV) (Eq 2.9)
i.HS_DIV(MIN) will be the next even number greater than or equal to the result derived in Eq 2.9
(keeping in the range of 10-1022)
Note:
SPEED_GRADE_MIN (Reg 48) ≤ LS_DIV x HS_DIV ≤ SPEED_GRADE_MAX (Reg 49); If outside this range, the output
will be forced to the disabled state.
5. Determine a value for M according to the following formula (all values are in decimal format):
a. M = LS_DIV x HS_DIV x FOUT/FXO (Eq 2.10)
b. M = LS_DIV x HS_DIV x FOUT(MHz)/31.98 (Eq 2.11)
c. M_Int = INT[M] (Eq 2.12)
d. M_Frac = (M – INT[M]) x 229 (Eq 2.13)
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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（標準） 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 標準包裝:50 |
| 514FBA000159AAG | 制造商:Silicon Laboratories Inc 功能描述:OSCILLATOR - Trays |
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