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| 型號： | AN-05 |
| 英文描述： | SY69952 in an OC-3 Transmission System |
| 中文描述： | SY69952中的OC - 3傳輸系統(tǒng) |
| 文件頁數(shù)： | 1/6頁 |
| 文件大?。?/td> | 60K |
| 代理商： | AN-05 |
W
T
Ref. Plane
(Ground)
Dielectric
Height H
Ref. Plane
(Ground)
Place Conductor
Center at H/2
APPLICATION NOTE
AN-05
Rev.: C
Issue Date: June, 1998
Amendment: /0
SY69952 IN AN OC-3
TRANSMISSION SYSTEM
Introduction
The SY69952 Serial Transceiver is used in SONET/SDH
and ATM applications to recover clock and data information
from a 155.52MHz or 51.84MHz NRZ (Non Return to Zero)
or NRZI (Non Return to Zero Invert on ones) serial data
stream. This device also provides a bit rate Transmit clock,
from a byte rate source through the use of a frequency
multiplier PLL, and differential data buffering for the Transmit
side of the system. This device is compliant with all relevant
SONET/SDH specifications including ANSI T1X1.6/91-022,
ANSI T1X1.3/93-006R1 Draft and ITU/CCITT G958.
H is the height of the Dielectric to the Ground (Ref. Plane)
W is the Trace Width (Design Variable)
Er is the Dielectric Constant –
Consult with your Board Fabrication House (4.4 Typical)
T is the thickness of the run –
Consult with your Board Fabrication House (Typically 0.0022 with
Plating)
H is the height of the Dielectric to the Ground (Ref. Plane)
W is the Trace Width (Design Variable)
Er is the Dielectric Constant –
Consult with your Board Fabrication House (4.4 Typical)
T is the thickness of the run –
Consult with your Board Fabrication House (Typically 0.0022 with
Plating)
FORMULAS FOR CALCULATION OF CONTROLLED IMPEDANCE RUNS
Microstrip
Stripline
Figure 1
Figure 2
Requirements:
W/(H-T)<0.35 AND T/H<0.25
General Requirements
For optimum performance of SY69952, loop filter networks
are required. The loop filter network can be achieved using
very few low cost external components. The purpose of the
loop filter network is to minimize jitter characteristics of the
device. In addition, proper power supply filtering techniques
can also minimize jitter and matched impedance techniques
should be used to maximize operating frequency and
minimize wave-form distortion.
87
Er
+ 1.41
Ln
5.98
H
0.8
W
+
T
60
Ln
4
H
0.536
π
W
+ 0.67
π
T
Er
W
T
1/2
Ref. Plane (Ground)
Dielectric
Height H
1
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