參數(shù)資料
型號(hào): ADN2806ACPZ-500RL7
廠商: Analog Devices Inc
文件頁(yè)數(shù): 2/20頁(yè)
文件大?。?/td> 0K
描述: IC CLK/DATA REC 622MBPS 32-LFCSP
標(biāo)準(zhǔn)包裝: 500
類(lèi)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: LVDS
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: 622MHz
電源電壓: 3 V ~ 3.6 V
工作溫度: -40°C ~ 85°C
安裝類(lèi)型: 表面貼裝
封裝/外殼: 32-VFQFN 裸露焊盤(pán),CSP
供應(yīng)商設(shè)備封裝: 32-LFCSP-VQ(5x5)
包裝: 帶卷 (TR)
ADN2806
Rev. C | Page 10 of 20
JITTER SPECIFICATIONS
The ADN2806 CDR is designed to achieve the best bit-
error-rate (BER) performance and to exceed the jitter
transfer, generation, and tolerance specifications proposed
for SONET/SDH equipment defined in the Telcordia
Technologies specification.
Jitter is the dynamic displacement of digital signal edges from
their long-term average positions, measured in unit intervals
(UI), where 1 UI = 1 bit period. Jitter on the input data can
cause dynamic phase errors on the recovered clock sampling
edge. Jitter on the recovered clock causes jitter on the
retimed data.
The following sections briefly summarize the specifications of
jitter generation, transfer, and tolerance in accordance with the
Telcordia document (GR-253-CORE, Issue 3, September 2000)
for the optical interface at the equipment level and the
ADN2806 performance with respect to those specifications.
Jitter Generation
The jitter generation specification limits the amount of jitter
that can be generated by the device with no jitter and wander
applied at the input. For SONET devices, the jitter generated
must be less than 0.01 UI rms and less than 0.1 UI p-p.
Jitter Transfer
The jitter transfer function is the ratio of the jitter on the output
signal to the jitter applied on the input signal vs. the frequency.
This parameter measures the amount of jitter on an input signal
that can be transferred to the output signal (see Figure 11). This
amount is limited.
0.1
ACCEPTABLE
RANGE
fC
JITTER FREQUENCY (kHz)
SLOPE = –20dB/DECADE
JI
TTE
R
GA
IN
(
d
B
)
0
5
831-
015
Figure 11. Jitter Transfer Curve
Jitter Tolerance
The jitter tolerance is defined as the peak-to-peak amplitude of
the sinusoidal jitter applied on the input signal, which causes a
1 dB power penalty. This is a stress test intended to ensure that
no additional penalty is incurred under the operating
conditions (see Figure 12).
15.00
1.50
0.15
f0
f1
f2
f3
f4
JITTER FREQUENCY (kHz)
SLOPE = –20dB/DECADE
IN
P
U
T
J
ITT
E
R
AM
P
L
IT
UD
E
(
U
I
p
-p
)
0
58
31
-0
16
Figure 12. SONET Jitter Tolerance Mask
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