参数资料
型号: SI5315B-C-GMR
厂商: Silicon Laboratories Inc
文件页数: 28/54页
文件大小: 0K
描述: IC CLOCK MULT 8KHZ-125MHZ 36QFN
应用说明: SI5315/17 Crystal Selection AppNote
标准包装: 250
系列: DSPLL®
类型: 时钟/频率倍增器,抖动衰减器,多路复用器
PLL:
主要目的: 以太网,SONET/SDH/PDH,电信
输入: CML,CMOS,LVDS,LVPECL
输出: CML,CMOS,LVDS,LVPECL
电路数: 1
比率 - 输入:输出: 2:2
差分 - 输入:输出: 是/是
频率 - 最大: 125MHz
电源电压: 1.71 V ~ 3.63 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 36-VFQFN 裸露焊盘
供应商设备封装: 36-QFN(6x6)
包装: 带卷 (TR)
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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