參數(shù)資料
型號(hào): ADN2818ACPZ
廠商: Analog Devices Inc
文件頁(yè)數(shù): 14/40頁(yè)
文件大?。?/td> 0K
描述: IC CLOCK/DATA RECOVERY 32-LFCSP
標(biāo)準(zhǔn)包裝: 1
類型: 時(shí)鐘和數(shù)據(jù)恢復(fù)(CDR),多路復(fù)用器
PLL:
主要目的: SONET/SDH
輸入: CML
輸出: CML
電路數(shù): 1
比率 - 輸入:輸出: 1:2
差分 - 輸入:輸出: 是/是
頻率 - 最大: 2.7GHz
電源電壓: 3 V ~ 3.6 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 32-VFQFN 裸露焊盤,CSP
供應(yīng)商設(shè)備封裝: 32-LFCSP-VQ(5x5)
包裝: 托盤
產(chǎn)品目錄頁(yè)面: 788 (CN2011-ZH PDF)
Data Sheet
ADN2817/ADN2818
Rev. E | Page 21 of 40
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 or the other.
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, and so 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,
so that larger phase differences are needed to make the loop
control voltage big enough to tune the range of the phase shifter.
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 3 MHz at OC-48.
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