- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄374647 > S2078 (Applied Micro Circuits Corp.) Dual Fibre Channel Transceiver(雙光纖通道收發(fā)器) PDF資料下載
參數(shù)資料
| 型號： | S2078 |
| 廠商： | Applied Micro Circuits Corp. |
| 英文描述： | Dual Fibre Channel Transceiver(雙光纖通道收發(fā)器) |
| 中文描述： | 雙光纖通道收發(fā)器（雙光纖通道收發(fā)器） |
| 文件頁數(shù)： | 1/8頁 |
| 文件大小： | 111K |
| 代理商： | S2078 |
Part Number S2078
Revision 1.0 - February 25, 2000
1
APPLICATION NOTE
S2078
Application Note and Reference Diagrams
Introduction
This document is intended to assist customers in using AMCC's S2078 dual channel physical layer device. Details
concerning application information, circuit design, layout, and component selection are provided to help insure first-
pass success in implementing a functional design with optimal signal quality. This document should be used in con-
junction with the product device specification. An elementary knowledge of high-speed printed circuit layout
techniques is assumed. Contact your local AMCC Field Applications Engineer or Regional Sales Manager to dis-
cuss any questions or concerns you may have.
Serial Input / Output Connections
Figure 1 shows the basic coupling termination scheme for the S2078 high-speed serial inputs. The serial inputs are
internally DC biased at VCC - 1.3 V. Recommended external connections include 0.01
μ
F (or 0.1
μ
F) AC coupling
capacitors and a line-to-line termination resistor. The termination resistor is required for lines lengths greater than 1
cm, which exhibit transmission line effects at gigabit speeds. The termination must match the characteristic imped-
ance of the differential lines to minimize signal reflections. The 100
value shown assumes characteristic line
impedance of 50
(if the lines are 75
, the line-to-line termination resistor should be 150
). The AC coupling
capacitors allow the DC bias point to be set internally by the input stage. The DC bias can be set externally by
implementing a resistor divider network on each line, but this is not recommended since it increases the part count
and does not provide performance improvement.
Figure 2 shows the connection diagram for high-speed serial outputs. The 4.5 k
pull-down resistors set the drive
current of the output stage. The outputs of the S2078 have internal pull-down resistors integrated into the output
macro. For Fibre Channel applications the 4.5 k
pull-down resistors can be omitted. This will slightly reduce signal
swing and slightly degrade signal integrity, but the part easily passes ANSI X3T11 requirements without the exter-
nal pull-down resistors in place. For serial backplane applications, where greater eye opening into the receiver
results in lower bit error rates, the pull-down resistor may be included or removed as a system trade-off; ease of
layout vs. slightly better signal integrity.
Figure 3 shows an input offset voltage biasing configuration, which should be implemented in the event that the
input is unused and may be subjected to noise. The 220 k
pull-down resistor offsets the input by approximately
60 mV, insuring that noise signals with amplitude less than 60 mV will not cause the input to chatter.
At a signal rate of 1.25 Gbps the output stage can drive more than 25 m of Twinax cable directly, with or without the
external 4.5 k
pull-down resistors.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| S2080 | 34×34 3.2 Gbit/s Differential Crosspoint Switch(高達(dá)3.2 Gbit/s數(shù)據(jù)傳送速率的34×34差分交叉開關(guān)) |
| S208T01 | Low Profile Type Solid State Relays |
| S208T02 | Low Profile Type Solid State Relays |
| S2091 | 2.5 Gbit Port Bypass Circuit for Fibre Channel Arbitrated Loop(用于光纖通道仲裁環(huán)路的端口旁路電路) |
| S2092 | Serial Backplane Retimer Device(帶片上頻率鎖相環(huán)的串行重定時芯片) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| S2079 | 制造商:MA-COM 制造商全稱:M/A-COM Technology Solutions, Inc. 功能描述:Drivers for GaAs FET Switches and Digital Attenuators |
| S2079B1LF | 制造商:BOTHHAND 制造商全稱:Bothhand USA, LP. 功能描述:ISDN S-INTERFACE DUAL TRANSFORMER MODULES SMLL SMT PACKAGE 23.5×12.3×9mm |
| S207R | 制造商:MINMAX 制造商全稱:Minmax Technology Co., Ltd. 功能描述:2W, Low Cost DIP, Single & Dual Output DC/DC Converters |
| S-208 | 制造商:SCANBE/VERO 功能描述: |
| S2080 | 制造商:Tyan 功能描述:MB;ATX;S370;PIIIT;SDRAM;SINGLE 制造商:Microsemi Corporation 功能描述:800V 16A 2PIN DO-203AA - Bulk |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。