参数资料
型号: ADN2818ACPZ-RL7
厂商: Analog Devices Inc
文件页数: 11/40页
文件大小: 0K
描述: IC CLOCK/DATA RECOVERY 32-LFCSP
标准包装: 1,500
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: CML
电路数: 1
比率 - 输入:输出: 1:2
差分 - 输入:输出: 是/是
频率 - 最大: 2.7GHz
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: 带卷 (TR)
Data Sheet
ADN2817/ADN2818
Rev. E | Page 19 of 40
JITTER SPECIFICATIONS
The ADN2817/ADN2818 CDR is designed to achieve the best
bit error rate (BER) performance and exceeds 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
ADN2817/ADN2818 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 OC-48 devices, the band-pass filter
has a 12 kHz high-pass cutoff frequency with a roll-off of
20 dB/decade and a low-pass cutoff frequency of at least
20 MHz. The jitter generated must be less than 0.01 UI rms
and must be 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 limited amount of the jitter on
an input signal that can be transferred to the output signal
0.1
ACCEPTABLE
RANGE
fC
JITTER FREQUENCY (kHz)
SLOPE = –20dB/DECADE
JI
TTE
R
GA
IN
(
d
B
)
0
60
01-
01
5
Figure 26. 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
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
A
M
P
L
ITU
D
E
(
U
I
p-
p
)
060
01
-01
6
Figure 27. SONET Jitter Tolerance Mask
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