Multisim中LM386芯片的构建步骤.docx

Multisim中LM386芯片的构建步骤.docx

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Multisim中LM386芯片的构建步骤

Multisim中LM386芯片的构建步骤

TheLM386isalowvoltageaudiopoweramplifierintegratedcircuit（IC）・TobeabletosimulatethecomponentinMultisimanduseitinUltiboardPCBdesigns,itneedstobecreatedusingtheComponentWizardinMultisim.Filesneeded:

Symbolfile（LM386・sym）andSPICEmodel（LM386.cir）.

StartMultisim.Under"Tools",choose''ComponentWizard"・

Step1:

Entercomponentinformation.

Step2:

Enterfootprintinformation.

Clickon"Selectafootprint".

Therearesome5000footprintsintheMasterDatabase・Tofindtheonethatweneedmoreeasily,clickon"Filter〃・Clickon"Addrow"andselect"Footprint"fromthedropdownmenuunder"Column"・Setthe"Operator"to"Contains"andenter"DIP8"under"Value"asshownbelow.

Selectthez，UltiboardDIPS'"footprint.

Clickon"Select"・Inthefootprintinformationwindowsetthe

numberofpinsto8.

Step3:

Entersymbolinformation.

ComponentWizard-Step3of8

Entersymbolinformation

1Edit

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Clickon"Edit"toopentheSymbolEditor.

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DownloadthefileLM386・symandrememberthelocationwhereyouputit.IntheSymbolEditorclickon"File"and"Open.・・"andopenthe

LM386.symfile.

：

o并丫•：

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thebottom

Donotchangeanyofthepininformationthatappearsofthesymboleditor・Clickon"Exit"andanswer"Yes"tothe"Savechanges?

"question.Nowthesymbolinformationwindowshouldlooklikethis：

Entersymbolinformation

CopyfromDB

fCopYto...|

VBxkJ|Next7|]ConT][Help

Step4:

Setpinparameters・Clickon"\ext"andchangethepin

Typesforthedifferentpins（from"BIDIRECTIONAL"）tothevaluesshownbelow.

Step5:

Setmappinginformationbetweensymbolandlayoutfootprint.

Click"Next"andfillinthefootprintpinsinasshownnext.

Step6:

SelectSimulationmode1.Click"\ext"toobtainthe"Selectsimulationmodel"window.

DownloadthefileLM386・cirandrememberthelocationwhereyouputit.Thenclickon"Loadfromfile"andopentheLM386・cirfile・YoushouldseeawindowwiththeLM386SPICEmodelfilledinasshownbelow.

q1

gnd

inn

10011

ddpnr

rl

inn

gnd

50k

口2

gnd

inn

10012

ddpnp

r2

inp

gnd

50k

*differentialinputstage,gain—setting

*resistor®zandintexna.1ieedback3?

esistor:

Step7:

Mappinginformationbetweensymbolandsimulationmode1.

Click"Next"andfillintheModelnodesinthePinmappingtableasfollows・（Note:

Themodelnodesarenumbered1,2,3,・・・fromlefttorightinthe・SUBCKTspecification,irrespectiveofthepinnumbersinthefootprintmapping・）

5etm^DDiroinforrratbnbetv^eeisymbdandsimulationmcdd（Thes/rrbolmustcontanatfeastasmsypinsasthemodelhasconnecticnpoints.）

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Step8:

Savecomponenttodatabase・ClickNextandinthenextwindowclickon"UserDatabase''andselect，zAnalog"・

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Clickon"Addfamily"andenter"Amplifier"forthefamilyname.

Finally,click"Finish"andyouaredonewithLM386componentcreation.CheckthatyoucanselectthecomponentinMultisim.

Thenplacethecomponentonaschematic.

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