参数资料
型号: ADN2806ACPZ
厂商: Analog Devices Inc
文件页数: 4/20页
文件大小: 0K
描述: IC CLK/DATA REC 622MBPS 32-LFCSP
标准包装: 1
类型: 时钟和数据恢复(CDR),多路复用器
PLL:
主要目的: SONET/SDH
输入: CML
输出: LVDS
电路数: 1
比率 - 输入:输出: 1:2
差分 - 输入:输出: 是/是
频率 - 最大: 622MHz
电源电压: 3 V ~ 3.6 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 32-VFQFN 裸露焊盘,CSP
供应商设备封装: 32-LFCSP-VQ(5x5)
包装: 托盘
ADN2806
Rev. C | Page 12 of 20
At medium jitter frequencies, the gain and tuning range of the
VCO are not large enough to track input jitter. In this case, the
VCO control voltage becomes large and saturates, and the VCO
frequency dwells at one extreme of its tuning range. The size of
the VCO tuning range, therefore, has only a small effect on the
jitter accommodation. The delay-locked loop control voltage is
now larger; therefore, the phase shifter takes on the burden of
tracking the input jitter. The phase shifter range, in UI, can be
seen as a broad plateau on the jitter tolerance curve. The phase
shifter has a minimum range of 2 UI at all data rates.
The gain of the loop integrator is small for high jitter
frequencies; therefore, larger phase differences are needed to
increase the loop control voltage enough to tune the range of
the phase shifter. However, large phase errors at high jitter
frequencies cannot be tolerated. In this region, the gain of the
integrator determines the jitter accommodation. Because the
gain of the loop integrator declines linearly with frequency,
jitter accommodation is lower with higher jitter frequency. At
the highest frequencies, the loop gain is very small, and little
tuning of the phase shifter can be expected. In this case, jitter
accommodation is determined by the eye opening of the input
data, the static phase error, and the residual loop jitter
generation. The jitter accommodation is roughly 0.5 UI in this
region. The corner frequency between the declining slope and
the flat region is the closed-loop bandwidth of the delay-locked
loop, which is roughly 1.0 MHz at 622 Mbps.
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