參數(shù)資料
型號(hào): ADN2819ACPZ-CML
廠商: Analog Devices Inc
文件頁(yè)數(shù): 5/24頁(yè)
文件大小: 0K
描述: IC CLOCK/DATA RECOVERY 48LFCSP
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,STM
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: 48-VFQFN 裸露焊盤,CSP
供應(yīng)商設(shè)備封裝: 48-LFCSP
包裝: 托盤
ADN2819
Rev. B | Page 13 of 24
The gain of the loop integrator is small for high jitter
frequencies, so 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. Since 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 5 MHz for OC-12,
OC-48, and GbE data rates, and 600 kHz for OC-3 data rates.
JITTER PEAKING
IN ORDINARY PLL
ADN2819
Z(s)
X(s)
f (kHz)
JITTER
GAIN
(dB)
o
n psh
d psh
c
02999-B
-016
Figure 16. Jitter Response vs. Conventional PLL
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