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AN-05

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SY69952 in an OC-3 Transmission System

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AN-05 数据手册

SY69952 IN AN OC-3

TRANSMISSION SYSTEM

APPLICATION NOTE

AN-05

Introduction

General Requirements

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.

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.

FORMULAS FOR CALCULATION OF CONTROLLED IMPEDANCE RUNS

Microstrip Stripline

Ref. Plane

(Ground)

Dielectric

Height H

Dielectric

Height H

Ref. Plane (Ground)

Ref. Plane

(Ground)

1/2

Place Conductor

Center at H/2

Figure 1

Figure 2

Requirements: W/(H-T)<0.35 AND T/H<0.25

5.98 H

0.8 W + T

0.536πW + 0.67πT

Er + 1.41

H is the height of the Dielectric to the Ground (Ref. Plane)

W is the Trace Width (Design Variable)

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)

Consult with your Board Fabrication House (Typically 0.0022 with

Plating)

Rev.: C

Amendment:/0

Issue Date: June, 1998

12 3 4 5 6

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