參數(shù)資料
型號: ADN2812ACPZ
廠商: Analog Devices Inc
文件頁數(shù): 7/28頁
文件大小: 0K
描述: IC CLOCK/DATA RECOVERY 32LFCSP
標(biāo)準(zhǔn)包裝: 1
類型: 時鐘和數(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
Data Sheet
ADN2812
Rev. E | Page 15 of 28
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, 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 integra-
tor 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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