參數(shù)資料
型號(hào): SI5315-EVB
廠商: Silicon Laboratories Inc
文件頁(yè)數(shù): 32/54頁(yè)
文件大?。?/td> 0K
描述: BOARD EVAL SI5315 8KHZ-644.53MHZ
應(yīng)用說(shuō)明: SI5315/17 Crystal Selection AppNote
標(biāo)準(zhǔn)包裝: 1
主要目的: 計(jì)時(shí),時(shí)鐘乘法器
嵌入式:
已用 IC / 零件: SI5315
主要屬性: 2 輸入,2 輸出
次要屬性: CML,CMOS,LVDS,LVPECL
已供物品: 板,CD,文檔
Si5315
38
Rev. 1.0
7. Crystal/Reference Clock Input
The device can use an external crystal or external clock as a reference. If an external clock is used, it must be ac
coupled. With appropriate buffers, the same external reference clock can be applied to CKINn. Although the
reference clock input can be driven single ended (See Figure 18), the best performance is with a crystal or low
jitter, differential clock source. No external loading capacitors are required for normal crystal operation.
Figure 18. CMOS External Reference Circuit
Figure 19. Sinewave External Reference Clock Input Example
Figure 20. Differential External Reference Clock Input Example
3.3 V
CMOS buffer,
8 mA output current
3.3 V
130
150
150
XA
10 k
0.1
F
0.6 V
0.1
F
XB
Si5315
For 2.5 V operation, change 130
to 82 .
External Clock Source
50
0.01
F
1.2 V
0.6 V
10 pF
Si5315
10 k
XA
0 dBm into 50
0.01
F
XB
0.1 F
LVPECL, CML, etc.
0.01
F
1.2 V
0.6 V
Si5315
XA
XB
10 k
100
0.01
F
10 k
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