- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄116183 > 570ABA000195DG (SILICON LABORATORIES) CRYSTAL OSCILLATOR, CLOCK, 10 MHz - 1417.5 MHz, LVPECL OUTPUT PDF資料下載
參數(shù)資料
| 型號： | 570ABA000195DG |
| 廠商： | SILICON LABORATORIES |
| 元件分類： | XO, clock |
| 英文描述： | CRYSTAL OSCILLATOR, CLOCK, 10 MHz - 1417.5 MHz, LVPECL OUTPUT |
| 封裝： | ROHS COMPLIANT PACKAGE-8 |
| 文件頁數(shù)： | 7/30頁 |
| 文件大?。?/td> | 361K |
| 代理商： | 570ABA000195DG |
第1頁第2頁第3頁第4頁第5頁第6頁當前第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁
Si570/Si571
Rev. 1.1
15
Figure 4. Example of RFREQ Decimal to Hexadecimal Conversion
Once the new values for RFREQ, HSDIV, and N1 are
determined, they can be written directly into the device
from the serial port using the following procedure:
1. Freeze the DCO (bit 4 of Register 137)
2. Write the new frequency configuration (RFREQ,
HS_DIV, N1)
3. Unfreeze the DCO and assert the NewFreq bit (bit 6
of Register 135) within the maximum delay specified
The process of freezing and unfreezing the DCO will
cause the output clock to momentarily stop and start at
any arbitrary point during a clock cycle. This process
can take up to 10 ms. Circuitry that is sensitive to
glitches or runt pulses may have to be reset after the
new frequency configuration is written.
Example:
An Si570 generating 156.25 MHz must be re-configured
to generate a 161.1328125 MHz clock (156.25 MHz x
66/64). This frequency change is greater than
±3500 ppm.
fout =156.25MHz
Read the current values for RFREQ, HS_DIV, N1:
RFREQcurrent = 0x2BC011EB8h = 11744124600d,
11744124600d x 228 = 43.7502734363d
HS_DIV = 4
N1 = 8
Calculate fXTAL, fDCO_current
Given fout_new = 161.1328125 MHz, choose output
dividers that will keep fDCO within the range of 4.85 to
5.67 GHz. In this case, keeping the same output
dividers will still keep fDCO within its range limits:
Calculate the new value of RFREQ given the new DCO
frequency:
46.043042064
Convert integer portion to a 10-bit binary number
46 = 00 0010 1110b
Concatenate the two results
00 0010 1110 0000 1011 0000 0100 1100 1110 0000b
Convert to Hex
02E0B04CE0h
Multiply the fractional portion by 228
.043042064 x 228 = 11554016.077
Truncate the remaining fractional portion
= 11554016
Convert to a 28-bit binary number (pad 0s on the left)
0000 1011 0000 0100 1100 1110 0000
fDCO_current
fout HSDV
×
N1
×
5.000000000 GHz
==
fXTAL
fDCO_current
RFREQcurrent
---------------------------------------
114.285 MHz
==
fDCO_new
fout_new HSDVnew
×
N1new
×
161.1328125 MHz 4
×
8
×
5.156250000 GHz
=
==
RFREQnew
fDCO_new
fXTAL
-----------------------
45.11746934
0x2D1E12788
=
==
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 531WA50M0000DG | CRYSTAL OSCILLATOR, CLOCK, 50 MHz, CMOS/TTL OUTPUT |
| 530GB48M0000DG | CRYSTAL OSCILLATOR, CLOCK, 48 MHz, CMOS OUTPUT |
| 531VA48M0000DGR | CRYSTAL OSCILLATOR, CLOCK, 48 MHz, CMOS OUTPUT |
| 531MB125M000BG | CRYSTAL OSCILLATOR, CLOCK, 125 MHz, LVPECL OUTPUT |
| 50.0MHZCFPS-55C | CRYSTAL OSCILLATOR, CLOCK, 50 MHz, CMOS OUTPUT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 570ABA000196DG | 制造商:Silicon Laboratories Inc 功能描述:PROGRAMMABLE XO, LVPECL - Trays |
| 570ABA000208DG | 制造商:Silicon Laboratories Inc 功能描述:SMD CRYSTAL OSCILLATOR 28.4MHZ 3.3V 6-PIN SMD - Trays |
| 570ABA000256DG | 制造商:Silicon Laboratories Inc 功能描述:SMD CRYSTAL OSCILLATOR 690.725MHZ 3.3V 6-PIN SMD - Trays |
| 570ABA000282DG | 制造商:Silicon Laboratories Inc 功能描述:SMD CRYSTAL OSCILLATOR 10MHZ 3.3V 6-PIN SMD - Trays |
| 570ABA000282DGR | 制造商:Silicon Laboratories Inc 功能描述:SMD CRYSTAL OSCILLATOR 10MHZ 3.3V 6-PIN SMD - Tape and Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。