參數(shù)資料
型號(hào): SI5315-EVB
廠商: Silicon Laboratories Inc
文件頁數(shù): 28/54頁
文件大小: 0K
描述: BOARD EVAL SI5315 8KHZ-644.53MHZ
應(yīng)用說明: 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
34
Rev. 1.0
6. High-Speed I/O
6.1. Input Clock Buffers
The Si5315 provides differential inputs for the CKINn clock inputs. These inputs are internally biased to a common
mode voltage [see Table 2, “DC Characteristics”] and can be driven by either a single-ended or differential source.
Figure 11 through Figure 14 show typical interface circuits for LVPECL, CML, LVDS, or CMOS input clocks. Note
that the jitter generation improves for higher levels on CKINn (within the limits in Table 3, “AC Characteristics”).
AC coupling the input clocks is recommended because it removes any issue with common mode input voltages.
However, either ac or dc coupling is acceptable. Figures 11 and 12 show various examples of different input
termination arrangements. Unused inputs can be left unconnected.
Figure 11. Differential LVPECL Termination
Figure 12. Single-ended LVPECL Termination
40 k
C
±
CKIN
_
CKIN +
VICM
300
130
3.3 V
82
Si5315
LVPECL
Driver
40 k
40 k
C
CKIN
_
CKIN +
VICM
300
130
3.3 V
82
Si5315
Driver
40 k
±
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