参数资料
型号: SI5315B-C-GMR
厂商: Silicon Laboratories Inc
文件页数: 11/54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
Rev. 1.0
19
5. Frequency Plan Tables
For ease of use, the Si5315 is pin controlled to enable simple device configuration of the frequency plan and PLL
loop bandwidth via a predefined look up table. The DSPLL has been optimized for each frequency multiplication
and PLL loop bandwidth provided in Table 9 on page 20.
Many of the control inputs are three levels: High, Low, and Medium. High and Low are standard voltage levels
determined by the supply voltage: VDD and Ground. If the input pin is left floating, it is driven to nominally half of
VDD. Effectively, this creates three logic levels for these controls. See 1.2. "Three-Level (3L) Input Pins (With
5.1. Frequency Multiplication Plan
The input to output clock multiplication is set by the 3-level FRQSEL[3:0] pins. The device provides a wide range of
commonly used SyncE, SONET/SDH, and PDH frequency translations. The CKIN1 and CKIN2 inputs must be the
same frequency as specified in Table 9. Both CKOUT1 and CKOUT2 outputs are at the same frequency.
5.1.1. PLL Loop Bandwidth Plan
The Si5315's loop bandwidth ranges from 60 Hz to 8.4 kHz. For each frequency multiplication, its corresponding
loop bandwidth is provided in a simple look up table. (See Table 9 on page 20.) The loop bandwidth (BW) is
digitally programmable using the 3-level BWSEL [1:0] and FRQTBL input pins.
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