參數(shù)資料
型號: SI5375B-A-GL
廠商: Silicon Laboratories Inc
文件頁數(shù): 9/54頁
文件大小: 0K
描述: IC CLK GEN/JITTER ATTEN 80LBGA
標準包裝: 240
系列: DSPLL®
類型: 時鐘發(fā)生器,漂移衰減器
PLL:
輸入: 時鐘
輸出: CML,CMOS,LVDS,LVPECL
電路數(shù): 1
比率 - 輸入:輸出: 4:4
差分 - 輸入:輸出: 是/是
頻率 - 最大: 808MHz
除法器/乘法器: 是/是
電源電壓: 1.71 V ~ 2.75 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 80-LBGA
供應(yīng)商設(shè)備封裝: 80-BGA(10x10)
包裝: 托盤
其它名稱: 336-2045
Si5375
Rev. 1.0
17
5.5. Reference Oscillator Selection
Care should be taken during the selection of the external oscillator that is connected to the OSC_P and OSC_N
pins. There is no jitter attenuation from the OSC reference inputs to the output; so, to achieve low output jitter, a
low-jitter reference OSC must be used. Also, the output drift during holdover will be the same as the drift of the
OSC reference. For example, a Stratum 3 application will require an OSC reference source that has Stratum 3
stability (though Stratum 3 accuracy is not required).
The OSC frequency can be any value from 109 to 125.5 MHz. See the RATE_REG (reg 2) description. Alternately,
for applications with less demanding jitter requirements, the OSC frequency can be in the range from 37 to
41 MHz. For applications that use Free Run mode, the freedom to use any OSC frequency within these bands can
be used to select an OSC frequency that has an integer relationship to the desired output frequency, which will
make it easier to find a high-performance frequency plan.
If Free Run is not being used, an OSC frequency that is not integer-related to the output frequency is preferred. A
recommended choice for an external oscillator is the Silicon Labs 530HB121M109DG, which is a 2.5 V, CML
device with a temperature stability of 20 ppm. It was used to take the typical phase noise plot on page 14. For more
details and a more complete discussion of these topics, see the Si53xx Reference Manual.
5.6. Alarms
To assist in the programming of the IRQ_n pins, refer to the below diagram of the Si5375 alarm structure.
Figure 6. Si5375 Alarm Structure
INT_POL
E
IRQ_n
IRQ_PIN
in
out
Sticky
Write 0
to clear
LOL_INT
LOL_FLG
LOL_MSK
in
out
Sticky
Write 0
to clear
LOS1_INT
LOS1_FLG
LOS1_MSK
in
out
Sticky
Write 0
to clear
LOSx_INT
LOSX_FLG
LOSX_MSK
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