422 和 485 标准的概述与系统配置 (Rev. C)

ᆌᆩԒߢ ZHCA028–2002౎6ሆ 422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ Manny Soltero, Jing Zhang, and Chris Cockrill ቌᄲ ெࡔࡔॆՔጚࣅፇኯ(ANSI) TIA/EIA-422ࢅTIA/EIA-485ՔጚLjᅃӯݴ՚׬ഄྺ422ࢅ485Ljन ྺሯำ࣍ৣዐᆩᇀ׊ਐ૗ຕ਍د๼ਏ༹ೝ࢚ຕ਍د๼ݛӄăԨ࿔Բডକኄଇ߲ՔጚLj༪ஃକ ഄएԨڦᅴཞLj঻ถକփཞᆌᆩዐፌၭࣅ၍Ⴀݒพڦፆੇ೅ದरຍLjཞ้ߴ؜କ֪๬঳ࡕă ాඹ ᆅჾ 4 422ࢅ485Քጚڦ߁ຎ 4 422ۉഘ༬Ⴀڦ჋ስ 5 ਸୟ๼؜ۉუ 5 ֶۯࢅց׋๼؜ۉუ 6 ܌ୟ๼؜ۉୁ 6 ࠲ऐ֪ଉ 7 ๼؜႑ࡽհႚ 7 ๼෇ۉუۉୁ༬Ⴀ 8 ๼෇ଳ௺܈ 9 ۉમዕ܋ 10 485ۉഘ༬Ⴀڦ჋ስ 10 U.L.ڦ߁౒ 11 ਸୟ๼؜ۉუ 12 ֶۯࢅց׋๼؜ۉუ 12 ׉ࡀఇ๕޶ሜֶۯ๼؜ۉუ 13 ܌ୟ๼؜ۉୁ 13 ๼؜႑ࡽհႚ 13 ๼෇ଳ௺܈ 14 ૙ၙዕ܋ࢅথںरຍ 14 ࿮ዕ܋ 15 ೝႜዕ܋ 17 ACዕ܋ 19 ਸୟࠤቱԍࢺዕ܋ 21 ਸୟࢅ܌ୟࠤቱԍࢺዕ܋ 23 ܠۅዕ܋ 25 থں૶থ 25 Linear Products 1422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ 2 422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cnZHCA028 ۆ႙ဣཥ঳ࠓ 26 ᅃӯဣཥ঳ࠓ 26 ዐ๸঳ࠓ 26 ۅܔۅ঳ࠓ 27 փཞՔጚኮक़ڦ०ᄲԲড 27 ᅃӯఇ๕ݔྷ 28 ၍؋཭ 28 घ૤ۉୁ 29 ঳ஃ 30 ׉९࿚༶ 31 ຍᇕ՗ 32 ௿ႇ 32 ֖੊࿔၅ 32 ཮ႚൣڇ 1 ೝ࢚ۉუຕጴথ੨ۉୟ 5 2 ਸୟ֪๬ۉୟ 5 3 ๼؜ۉუ֪๬ۉୟ 6 4 ܌ୟ๼؜ۉୁ֪๬ۉୟ 6 5 ࠲ऐ๼؜ۉୁ֪๬ۉୟ 7 6 ֪๬ۉୁࢅ๼؜႑ࡽհႚ 7 7 ๼෇থ๭ഗ֪๬ۉୟࢅۉୁ/ۉუհႚ 8 8 ๼෇ଳ௺܈֪๬ۉୟࢅ঳ࡕհႚ 9 9 485ೝ࢚ۉუຕጴথ੨ۉୟ 10 10 U.L.֪๬ۉୟࢅۉୁ/ۉუ࠲ဣ 11 11 ਸୟ֪๬ۉୟ 12 12 ๼؜ۉუ֪๬ۉୟ 12 13 ೵ཚఇ๕޶ሜ๼؜ۉუ֪๬ۉୟ 13 14 ܌ୟ๼؜ۉୁ֪๬ۉୟ 13 15 ๼؜႑ࡽ֪๬ۉୟ 15 16 ֶۯ࿮ዕ܋঳ࠓ 16 17 ֶۯ࿮ዕ܋ൻۯഗ๼؜հႚ 16 18 ֶۯ࿮ዕ܋থ๭๼෇հႚ 17 19 ֶۯժႜዕ܋঳ࠓ 18 20 ֶۯժႜዕ܋ൻۯഗ๼؜հႚ 18 21 ֶۯժႜዕ܋থ๭ഗ๼෇հႚ 18 22 ֶۯ኱ୁዕ܋঳ࠓ 19 23 ֶۯ኱ୁዕ܋ൻۯഗ๼؜հႚ 20 24 ֶۯ኱ୁዕ܋থ๭ഗ๼෇հႚ 20 25 ֶۯࠤቱԍࢺዕ܋঳ࠓ 21 26 ֶۯࠤቱԍࢺዕ܋ൻۯഗ๼؜հႚ 22 27 ֶۯࠤቱԍࢺዕ܋থ๭ഗ๼෇հႚ 23 3422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cn ZHCA028 28 ֶۯਸ/܌၍ࢅࠤቱԍࢺዕ܋঳ࠓ 23 29 ֶۯਸ/܌၍ࠤቱԍࢺዕ܋ൻۯഗ๼؜հႚ 24 30 ֶۯਸ/܌၍ࠤቱԍࢺዕ܋থ๭ഗ๼෇հႚ 24 31 ֶۯܠۅዕ܋঳ࠓ 24 32 ֖੊থں঳ࠓ 25 33 ࣍ႚ૶থ 26 34 ૶থڟዷ߅ྪڦ܌ۉમ 26 35 ۅܔۅ૶থ 27 36 ଇ߲૶থڟጺ၍ڦ485ൻۯഗ 27 ՗߭ൣڇ 1 ๼෇ଳ௺܈ࢅ422೅ದഗॲڦ๼؜ۉუ 9 2 ๼෇ଳ௺܈ࢅ485೅ದഗॲڦ๼؜ۉუ 14 3 485ࢅ422ࡀݔڦ०ᄲԲড 29 4 ዕ܋रຍڦ߁ຎ 29 4 422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cnZHCA028 ᆅჾ ৃཀ࿢்໯ኪڢڦ422ࢅ485Քጚ๟ೝ࢚ຕ਍د๼ݛӄLjኄዖݛӄྺ׊ਐ૗ࢅሯᅼ࣍ৣူຕ਍ڦد๼༵ࠃକ ᆶ૧঴ਦݛ݆ă࠳ݛྺኄଇዖՔጚൽକଇ߲ఁጴǖெࡔࡔॆՔጚࣅፇኯDŽANSIDžཚ႑߾ᄽၹࣷ(TIA)/ۉጱ߾ ᄽၹࣷ(EIA)Ċ422ࢅTIA/EIA-485Ljኄଇ߲Քጚۨ೺ںᆯTRĊ32.0ຕ਍ዕ܋ยԢĊຕ਍ཚ႑ยԢDŽTR-30.2 DTE-DCEDžথ੨ࢅཚ႑߾ᄽၹࣷ(TIA)TR-30ຕ਍د๼ဣཥᷣยԢ྿ᇵ֥ࣷӄၭፇႪ߀ăᅜRSਸཀྵڦ၄ሞᅙঢ় փም๑ᆩLjܸࡗඁ࢔׊ڦᅃ܎้क़ాLjଇ߲Քጚᅃ኱๟RSਸཀྵăཚ׉Lj࿢்ණྺټമጘᅪ࿆ጣ֖੊ՔጚLjڍ ๟ํाฉ໲ᅪ࿆ጣ࿮၍ۉևݴăྺକ൶՚Lj࠴ᅜ422ࢅ485ࢫጘă ኄ߲ᆌᆩԒߢ༵ࠃକ422ࢅ485Քጚڦ߁ຎăANSI࠳ݛ࿔ॲዐ௮ຎକ࢔ܠࡀݔLjኻᆶፌ೵Փڦ֍ሞᆌᆩԒߢ ૛ेᅜ༪ஃăኄዖᆌᆩԒߢڦణڦփ๟ް዆࠳ݛ࿔ॲLjܸ๟ଚ؜422ࢅ485Քጚኮक़एԨڦᅴཞăዷᄲࡀݔ ௮ຎڥ࢔ၘဦLjܔଇ߲Քጚᄺ৊ႜକԲডăᆯᇀد๼၍ၳᆌLj၍ݒพፌၭኵዐLjፆੇ೅ದ๟ֶۯຕ਍د๼ڦ ᅃ߲ዘᄲݛ௬Ljߴ؜କዕ܋փཞဣཥᆌᆩरຍăཞ้Ljᅃ߲ۆ႙ڦဣཥ঳ࠓཚ׉ᄲ੊୯ڦ๟ፌॅڦᆌᆩႠీ ࢅׯԨ၌዆ă 422ࢅ485Քጚڦ߁ຎ 422Քጚڦ࠳ݛఁ׬๟ೝ࢚ۉუຕጴহ௬থ੨ۉୟڦۉጱ༬ႠLjᆯANSIཚ႑߾ᄽၹࣷ/ۉጱ߾ᄽၹࣷࠅքă߾ᄽ হLjຍᇕ422๑ᆩড࠳ݛڦఁ׬߸े೵ՓLjኄ߲࿔ॲᄺ๟ᅃᄣă422ၘဦຫ௽କڇᅃڦܠኧୟՔጚLjनᅃ߲ ൻۯഗࢅגࡗๆ߲ᅜฉڦথ๭ഗ੗ᅜ૶থڟᅃཉጺ၍ă 485Քጚڦ࠳ݛఁ׬๟ᆌᆩᇀೝ࿘ຕጴܠۅဣཥ݀ิഗࢅথ๭ഗڦۉጱ༬Ⴀă485ড࠳ݛఁ׬ᆌᆩ߸े೵Փăසࡕ Ⴔᄲᅃ߲ᅜฉڦൻۯഗLjఫ஺ॺᅱᆩग़ඹᇀ485ڦഗॲă485ࡀݔሎႹᅃ߲ൻۯഗ௅ْ݀ໃຕ਍้Ljጺ၍੗ ᅜ૶থגࡗ32߲ڇᇮڦ޶ሜDŽU.LDžăU.L.ڦ߁౒ሞ485ۉጱࡀݔևݴڦᆌᆩԒߢዐ੗ᅜቴڟă 422ࢅ485ڦਸཀྵ੗ీԲড၎ຼLjڍܾኁ๟ᆶ൶՚ڦLj੗঍࣑Ⴀ๟ᆯጺ၍঳ࠓਦۨڦLj485Քጚᇑ422ۉഘฉ ग़ඹăྺକຫ௽໲்ኮक़एԨڦփཞLjথူઠڦᅃၭևݴ࿢்ߴ؜କ௅߲Քጚڦ०ᄲ௮ຎă 5422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cn ZHCA028 A B Logic (1 or 0) + – VOD + – + – VOAVOB NOTES: A. \VOD\ b 10 V, \VOA\ b 6 V, and \VOB\ b 6 V B. VOA = voltage on A output D 422ۉഘࡀݔڦ჋ስ ཮1ߴ؜କೝ࢚ۉუຕጴথ੨ăൻۯഗDŽ݀ิഗDžՔऻྺDLjথ๭ഗՔऻྺRLjLjዕ܋ፆੇՔऻྺZT.ዕ܋ፆੇ ᆌڪᇀۉમڦ༬ኙፆੇZOLjཞ้໲ኻሞۉમ఍܋ሏᆩᅃْăᅺྺዕ܋ፆੇ೅ದ዁ZO࢔వٳڟLjٳڟZOڦ20% ৽ፁࠕକăཞ้גࡗ9߲ܮྔڦথ๭ഗ੗ᅜݴ՚ᄂۉમٗۅAࢅۅBڟۅAďࢅۅBďݣዃă422Քጚுᆶ༬՚ ߴ؜ፌٷۉમ׊܈ڦ၌዆ă੊୯ڟኄᅃۅLjגࡗ1kmᅜฉLj႑ࡽد๼໏܈փߛᇀ100kbpsڦဣཥড׉९ă໏ ܈ࢅۉમ׊܈၎ࢻலܜă࣑ਔࣆຫLjۉમሁ׊Lj႑ࡽڦد๼໏܈৽ࣷሁ஥Ljܸຕ਍੗ᅜሞড܌ڦۉમዐد๼ ڦড੺ăߵ਍ُࡀሶLjຕ਍د๼໏܈DŽbpsDžױฉۉમ׊܈DŽ௝Džփᆌגࡗ108ăਉ߲૩ጱLjᅃ߲ۉમ500m ׊ڦဣཥຕ਍ڦد๼໏୲փᆌٷᇀ200kbpsDŽ108/500Džă ZT A’ B’ A B Logic (1 or 0) NOTES: A. D = driver (or generator) B. R = receiver C. ZT = termination impedance RD ཮1.ೝ࿘ۉუຕጴথ੨ۉୟ ৑࠶๢ᆩᇀ422Քጚڦথ๭ഗڦ๼෇ۉഘ༬Ⴀᇑ๢ᆩᇀ423থ๭ഗڦ๼෇ۉഘ༬ኙ၎ຼLjڍ423ၘဦຫ௽କᅃ ߲ݥೝ࿘د๼ݛӄLjኄ߲ݛӄփሞُᆌᆩԒߢڦݔྷኮాă ਸୟ๼؜ۉუDŽVOD,VOA,ࢅVOBڦ֪ଉDž ੣ሜ൧઄ူLj๼؜ۉუփᆌגࡗĠ6V,ֶۯۉუDŽᆯ๼؜ۉუVOA(VOBDžLjᇑց׋๼؜ۉუڦֶݴ֪ڥLj VOB(VOA)փٷᇀĠ10Vă཮2๟֪๬ۉୟă ጀ๥ǖ A.|VOD|İ10,|VOA|İ6VLj|VOB|İ6V B.VOA=Aۅ๼؜ۉუ C.VOB=Bۅ๼؜ۉუ D.VOD=ֶݴ๼؜ۉუ ཮2.ਸୟ֪๬ۉୟ 6 422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cnZHCA028 A B Logic (1 or 0) + – VOD VOS OTES: A \V \ r 2 V \V \ b 3 V 50 7 50 7 + – D ֶݴࢅց׋๼؜ۉუDŽVODࢅVOSڦ֪ଉDž ྺକԍኤࢇ๢ڦൻۯഽ܈Lj֪ଉକĠ2V VODڦፌၭኵࢅĠ3V VOSڦፌٷኵDŽ९཮3Džă߸ৎᅃօຫLjሞֶݴ๼ ؜ۉუኮक़Ljሞൻۯഗ๼؜ۉუे෇ᅃ߲੦዆Ljᅜ֪ଉኄၵۉუڦՎࣅDŽփגࡗ400mvDžăړൻۯ๼؜ገ࣑ ጒༀڦຨक़Lj400mvڦፌٷट၌๟ᅃዂڦă A B Logic (1 or 0) IOS D IOS ጀ๥ǖA. |VOD|ı2V,|VOS|İ3V B. |ŗVOD|=||VOD|-|VOD||İ0.4V C. |ŗVOS|=||VOS|-|VOS||İ0.4V ཮3.๼؜ۉუ֪๬ۉୟ ܌ୟ๼؜ۉୁDŽIOS֪ଉDž ൻۯ܌থڟںLj๼؜ۉୁڦፌٷኵփᆌגࡗ150mALjړ܌ୟ้Ljࢮ୼ൻۯഗ๼؜ጒༀăኄ߲֪๬ԍኤକഗॲ փԥཚࡗ๼؜ڦ؋ऍۉୁ໦࣋ă཮4ߴ؜କ֪๬ۉୟ. ጀ๥A:|IOS|዁ںİ150mA ཮4.܌ୟ๼؜ۉୁ֪๬ۉୟ 7422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cn ZHCA028 A B Logic (1 or 0) VOVO NOTE A: \Ioff\ b 100 MA for –0.25 b VO b 6 V D IOFF IOFF ࠲ऐ֪๬DŽIOFF֪๬ǗVOᆌᆩDž ස཮5໯๖Ljړ࠲Կൻۯഗ้Lj๼؜ۉუݔྷٗ-0.25VՎࣅ዁6V,๼؜୑ۉୁփᆌגࡗ10̂A.ۉୁٷᇀ100̂A ৽ࣷ೦࣋ጺ၍ڦയ૰ࢅࣷڞዂথ๭ഗ܋থ๭ٱဃڦຕ਍ă A B Logic (1 or 0) + –VOD 100 7 1.1 VSS VOD 1.1 VSS 0.9 VSS 0.1 VSS tui trtr 0.1 VSS 0.9 VSS 0-V Differential D VSSVOD ጀ๥A: -0.25İVOİ6v้|Ioff|İ100̂A ཮5.࠲ऐ๼؜ۉୁ֪๬ۉୟ ๼؜႑ࡽհႚDŽVOD֪๬Dž एԨฉLjኄ߲֪๬੗ᅜඓԍጺ၍ฉ႑ࡽዊଉăᅃ߲100౹ఛڦۉፆ૶থ዁ֶݴ๼؜Ljڇ࿋้क़׊܈ాLjኄ߲ ้क़क़߰ൽtuiई20nsዐডٷڦᅃၜLjVSSᆌሞ10%዁90%ኮक़ڇۙڦՎࣅă཮6ߴ؜କ֪๬ۉୟڦڪၳհႚă ଷྔLjሞገ࣑݀ิኮࢫDŽ၌ۨڦኟஞ؋ࢅ޶ஞ؋Džڪၳۉუڦ߀Վփᆌ޿גࡗVSSڦ10%ă ཮6.֪๬ۉୟࢅ๼؜႑ࡽհႚ ֖ຕǖA.tui=ڇ࿋้क़ڦ׼Ⴤ้क़ B.VSS=|VOD-VOD| C.2Vİ|VOD|İ10V 8 422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cnZHCA028 A’ B’ IIA’ IIB’ VIB’VIA’ +3V –3V +10V –10V –3.25 mA 3.25 mA VI II R Ү๼෇ۉୁ/ۉუ༬ႠDŽVIAďࢅVIBďڦᆌᆩǗIIAďࢅIIBďڦ֪ଉDž ړ໯ᆶڦๆ߲থ๭ഗۼ૶থڟጺ၍Lj๼෇༬Ⴀڦፌٷ၌዆๟ՂႷ૶থڟথ๭ഗLjᅜԍኤഄฉ޶ሜڦፌٷኵă ໜጣᅃӯఇ๕ۉუVIAď(VIBď)ٗ+10VՎࣅڟ-10VLjVIBďࢅ(VIAď)ԍ׼ྺ0Ljڪၳ๼෇ۉୁᆌ޿ԍ׼ሞਸऐࢅ࠲ऐ ཉॲူڦᅽᆖ൶ᇘዐăሞᅽᆖ൶ᇘዐLj๼෇༬Ⴀഗॲߴ؜କ๼෇ፆੇփၭᇀ4ഥ౹ఛLj޿ፆੇ๟ཚࡗऺ໙ڥ ؜ăฉևࢅူևՉহڦၽ୲ڪᇀፌၭ๼෇ፆੇă ཮7.๼෇থ๭ഗ֪๬ۉୟࢅۉୁࢅۉუ཮ ጀ๥A:R=ŗV/ŗI=13V/3.25Ma=4kˮ 9422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cn ZHCA028 APPLIED VOLTAGE RESULTING RESULTING RECEIVEROUTPUT PURPOSE OF MEASUREMENTS VIA’ VIB’ VID VCM OUTPUT STATE PURPOSE OF MEASUREMENTS +10 V –2 V +12 V +4 V Q Ensures correct operation with maximum differential voltage supply –10 V +2 V –12 V –4 V Q Ensures correct operation with maximum differential voltage supply +10 V +4 V +6 V +7 V Q Ensures correct operation with maximum common mode voltage supply –10 V –4 V –6 V –7 V Q Ensures correct operation with maximum common-mode voltage supply +100 mV –100 mV +200 mV 0 V Q –100 mV +100 mV –200 mV 0 V Q 200 mV threshold test across common mode voltage supply +7.1 V +6.9 V +200 mV +7 V Q 200-mV threshold test across common-mode voltage supply –7.1 V –6.9 V –200 mV –7 V Q A’ B’ + – + – VIB’VIA’ + – VID +10 –10 +200 mV –200 mV VID Transition Region Maximum Operating Range NOTE A: 200 mV < |VID| < 10 V R VID ๼෇ଳ௺܈DŽVCM,VIAďࢅVIBďᆌᆩǗVIDڦ֪ଉDž ཮8ߴ؜କਦۨথ๭ഗ๼෇ଳ௺܈ڦ֪๬ۉୟăྺକԍኤඇఇ๕ݔྷڦࠀీLjॺᅱ֑ᆩ՗1ዐߴ؜ڦ๼෇ࢅ֪ ଉణՔڦ֪๬ۉუă ཮8.๼෇ଳ௺܈֪๬ۉୟࢅׂิڦհႚ ጀ๥ Aǖ200mV<|VID|<10V ܔᇀᅃӯఇ๕ۉუٗ-7VՎࣅڟ7VLjኟඓںࠚऺణڦጒༀLjVIDփՂٷᇀĠ200mVăኟසՔጚዐڦၘဦຫ௽Lj ֶݴ๼෇ۉუVIDLjሞ200mVڟ10VݔྷాLjLj੗ᅜԍ׼ኟඓڦሏገă ՗1.๼෇ଳ௺܈ࢅ422ग़ඹڦഗॲڪၳۉუ 10 422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cnZHCA028 A ZT B A’ B’ A/A’ B/B’ ZT R2D1 D3/R3 ۉમዕ܋ සࡕഗॲڦຕ਍໏୲ၭᇀ200kbpsईኁۉમጎሜ఍܋ڦ႑ࡽฉื/ူই้क़ٷᇀ຺Ԡڦᅃୟۉમჽ׿Lj৽ՂႷ ᆩڟۉમዕ܋ăࢫኁৈೞঢ়ᄓڦݛ݆৽੗ᇑڥ؜Ljۆ႙ڦ๟ᆩᇀ௮ຎᅃ߲ݥد๼၍ڦဣཥăሞٷܠຕڦᆌᆩ ዐLjۉમዕ܋๟๯჋ă၎ඹᇀ422ڦဣཥۉમዕ܋ཚ׉૶থڟۉમ޶ሜ఍܋ă֖੊Քጚڦۉમዕ܋ڦ჋ስᆶ ଇ߲ݛӄăڼᅃ߲ݛӄ৽๟ǖ๑ዕ܋ፆੇࢅۉમڦ༬ኙፆੇZO၎೅ದLjڼܾ߲ݛӄ๟ǖ࠲႐ࠀ୲ࡼොڦยऺ ኁLj੗ᅜሞዕ܋ፆੇฉز૴ᅃ߲ܮྔڦۉඹăኄଇዖݛӄሞĖॺᅱዕ܋ࢅথںरຍėևݴᆶၘဦڦ༪ஃă 485ۉഘࡀݔڦ჋ስ ཚࡗԲড཮1ࢅ཮9Lj࿢்੗ᅜੂ؜422ࢅ485ڦքਆ๟փཞڦă485ᆌᆩᇀೝ࿘ຕጴܠۅဣཥLjܸ422௅ཉጺ ၍DŽܠኧୟDžኻీኧ׼ᅃ߲ൻۯഗă485ڦၘဦ֖ຕᇑ422ڦၘဦ֖ຕૌຼૌຼăڍ๟485ڦথ๭ഗࢅൻۯഗ ۉഘ༬ኙ߸ၘဦLj໲Ԉࡤକ422ڦᄲ൱ՂԢڦ۫ဇăኄᄺሎႹ485ڦൻۯഗࢅথ๭ഗ੗ᅜᆌᆩᇀ422ă ཮9. 485ೝ࿘ۉუຕጴথ੨ۉୟ ጀ๥ǖA.D1=diver B.D3/R3=࿮၍ۉ๭݀ऐ C.R2=থ๭ऐ D.ZT=ዕ܋ፆੇ E.ٷᇀ32 U.L.s[থ๭ഗLjൻۯഗDŽ੣ှጒༀDžLj࿮၍ۉ๭݀ऐ] ৑࠶485ၘဦࡀۨକᅃ߲ൻۯഗኻీሞߴۨڦ้क़ాཚࣆDŽӷມ߾߾ፕDžLjڍኄᄣ੗ీࣷٱဃጒༀڦ݀ิ DŽᆯ๼؜ൻۯഗई၍؋཭ฉڦᅪྔ܌ୟڞዂDžăᅺُ485ڦഗॲՂႷՆ௨ኄᅃۅăਉ߲૩ጱLj੊୯ړൻۯഗ ཮9ዐD1ڦ൧઄LjړD1ၠথ๭ഗR2݀ໃ႑ࡽLjڍൻۯഗD3ධ඗߾ፕăසࡕยऺኁሞਸ๔د๼ኮമൻۯକൻ ۯഗLj৽ࣷᆶᅃ߲ٱဃڦ൧઄݀ิLjٱဃڦຕ਍৽੗ీد๼ڟR2ăኄዖ൧઄ᄺ੗ᅜ׬ኮྺ၍؋཭DŽ९Քጚ߁ ຎԲডևݴDžă ፌٷڦۉમ׊܈ٷሀ1200măཚ׉൧઄ူLjᅃ߲ยऺኁ੗ᅜඨ๴ڦሯำඹ၌๟჋ስۉમ׊܈ڦਦۨᅺ໎ă 422ࢅ485ဣཥᆶཞᄣڦ࠲ဣǖ໏୲ࢅۉમ׊܈ă 11422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cn ZHCA028 A/A’ B/B’ IIA IIB VIBVIA +5V –3V +12V –7V –0.8 mA 1 mA VI II Load ڇ࿋޶ሜDŽU.L.Dž߁౒DŽVIAࢅVIBڦᆩǗIIAࢅIIBڦ֪ଉDž 422ዐLjۉୁ/ۉუ༬Ⴀڦፌٷ၌዆ՂႷ੊୯থ๭ഗLjൻۯഗDŽ࠲ԿጒༀDžࢅ࿮၍ۉ݀พጎዃLjᅜԍኤړ໯ᆶ 32U.L.Sۼتሞሏႜጒༀ้Ljጺ၍ฉڦ޶ሜፌٷăۉუVIADŽVIBDžሞ-7Vڟ12Vኮक़ՎࣅLjړVINDŽVIAথں้Lj ๼෇ۉୁᆌ޿ሞਸऐࢅ࠲ऐኮक़ڦᅽᆖ൶ᇘDŽ९཮10Džăتሞᅽᆖ൶ᇘ๼෇༬ኙڦഗॲᆶᅜ1߲U.Lڦ༬ኙă 485Քጚၘဦ௮ຎକኧ׼32U.L.sڦඹଉă485ཚ׉ԥණྺ๟12ഥ౹ڦ޶ሜՔጚăᅺྺൻۯഗڦൻۯۉୁᇑ޶ ሜ࿮࠲Ljړᅃ߲ยऺႴᄲٷଉ߾ፕበ(ൻۯഗLjথ๭ഗLjई࿮၍ۉ݀พጎዃ)Ljഄ૶থڟጺ၍ฉႴᄲᅃ߲ٷڦ ޶ሜፆੇᅜሎႹ߸ܠڦ૶থăਉ߲૩ጱLjᅃ߲0.5-U.L.ڦጺ၍੗ᅜݣዃ64Ԡᅜฉڦ๭݀ऐLjᅺྺُ঳ࠓᇑፌ ٷ32ĊU.L.ࡀݔ၎ᅃዂă ཮10. U.L.֪๬ۉୟࢅۉୁ/ۉუ࠲ဣ 12 422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cnZHCA028 A B Logic (1 or 0) + – VOD 375 7 375 7 60 7 –7 V b |VCM| b 12 V D A B Logic (1 or 0) + – + – VOAVOB + – VODD A B Logic (1 or 0) + – VOD VOS27 7 27 7 + – D ਸୟ๼؜ۉუDŽVOD,VOAࢅVOBڦ֪ଉDž ੣ሜ൧઄ူLj๼؜ۉუփᆌג؜Ġ6VڦݔྷLjׂิڦྲݴۉუᄺᆌ޿ሞĠ1.5VڟĠ6Vኮक़ă཮11ߴ؜କ֪๬ ۉୟ ጀ๥ǖA.1.5Vİ|VOD|İ6V B.|VOA|İ6V;|VOB|İ6V ཮11.ਸୟ֪๬ۉୟ ֶݴࢅց׋๼؜ۉუDŽVODࢅVOSڦ֪ଉDž ᇑ422ૌຼLj485ᄺࡀۨକፌၭ๼؜ۉუᆩᅜԍኤࢇ๢ڦൻۯഽ܈Ljڍཞ้ᅨࡀۨፌٷኵă཮12ߴ؜କ૶থ ڟֶݴࢅց׋ۉୟۉუڦ၌ܮăཞ้ᄺߴ؜କኄၵۉუڦՎࣅڦፌٷኵփᆌגࡗ200mVă ጀ๥ǖA.1.5Vİ|VOD|İ5V,ࢅ|ŗVOD|=||VOD|-|VOD||İ0.2V B.-1Vİ|VOS|İ3V,ࢅ|ŗVOS|=||VOS|-|VOS||İ0.2V ཮12.๼؜ۉუ֪๬ۉୟ ᅃӯఇ๕޶ሜڦֶݴ๼؜ۉუDŽVODڦ֪ଉǗVCMڦᆌᆩDž ֪๬ۉୟස཮13໯๖Ljֶݴ๼෇ۉუڦٷၭᆌ޿ሞ1.5Vࢅ5Vኮक़ă ጀ๥ A:1.5Vİ|VOD|İ5V ཮13.ᅃӯఇ๕ጎሜူڦ๼؜ۉუ֪๬ڇᇮ 13422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cn ZHCA028 A B Logic (1 or 0) VOVO NOTE A: \IOS\ to ground b 250 mA IOS IOS D A B Logic (1 or 0) VOD54 750 pF + –D ܌ୟ๼؜ۉୁDŽIOSڦ֪ଉǗVOڦᆌᆩDž ړٗ-7Vڟ12VՎࣅڦۉუᇸ܌থᇀൻۯഗ้Ljۉୁփגࡗ250mALjኄᄣൻۯഗ৽փࣷ໦࣋ăDŽ९཮14Džă ڤዝᅏഗཥᅃକ໯ᆶ485ഗॲLjኄዖټᆶඤ܏ਸۉୟڦഗॲ੗ᅜ஢ፁኄᅃႴ൱ă ཮14.܌ୟ๼؜ۉୁ֪๬ۉୟ ጀ๥ǖ|IOS|থ዁ںİ250mA ৑࠶ඤ܏ਸۉୟ၌዆କٗ๼؜ൻۯഗୁ؜ڦۉୁጺଉLjڍᆶ၌้क़ాLjቷጣ஢ଉײ-7Vڟ12Vඁፔ๟ᅃ߲ݥ׉ ჹ߭ڦ֪๬ăܔᇀლቴփཞप՚ڦ࿘ۨഗॲڦࠥਜ਼ઠຫLjTI༵ࠃକྜඇޙࢇࢅևݴޙࢇኄዖࡀݔڦׂ೗ă໚ ඗ևݴग़ඹڦഗॲࣷ၌዆஢ଉײڦۉୁLjڍփࣷሞ׊้क़ాԍ׼ۉୁăଷᅃ߲ևݴग़ඹڦ૩ጱ๟ࡀݔዐԍ׼ ׊้क़ۉୁڦీ૰Ljڍኄዖ൧઄๟ၭڦۉუݔྷă ๼؜-႑ࡽհႚDŽVODڦ֪ଉDž ྺକԍኤ႑ࡽዊଉLj485ܔ๼؜႑ࡽհႚߴ؜କ၌዆ă๼؜႑ࡽհႚᇑ௮ຎ422๼؜հႚڦ࢔၎ຼLjڍ485Ⴔ ᄲᅃֶ߲ݴ֪๬ۉୟDŽ९཮15Džă๼؜ۉუᆌړሞ0.3tui้क़ాLjጲۯڦሞ0.1VSSڟ0.9VSSኮक़ՎࣅăഄْLj ๼؜ۉუڦՎࣅփᆌגࡗVSSڦ10%,|VOD|”5V. ཮15.๼؜႑ࡽ֪๬ۉୟ 14 422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cnZHCA028 APPLIED VOLTAGE RESULTING VID RESULTING VCM RECEIVER OUTPUT PURPOSE OF VIA’ VIB’ VID VCM STATE MEASUREMENT –7 V –6.8 V –200 mV –6.9 V Q Minimum VI at extreme – VCM +12 V +11.8 V +200 mV +11.9 V Q Minimum VI at extreme + VCM –7 V –2 V –5 V –4.5 V Q Maximum VI at extreme – VCM +12 V +7 V +5 V +9.5 V Q Maximum VI at extreme + VCM ๼෇ଳ௺܈DŽVCM,VIAďࢅVIBďڦᆌᆩǗVIDڦ֪ଉDž ૧ᆩሞ422ዐڦཞᅃ֪๬ۉୟLj՗2ߴ؜କথ๭ഗ߾ፕۉუڦटኵLjࢅ௅ᅃ֪ଉڦణՔ ՗2.๼෇ଳ௺܈ࢅ485ഗॲڦڪၳۉუ ૙ၙዕ܋ࢅথںरຍ ړยऺᅃ߲ဣཥLjኄ߲ဣཥᆩग़ඹᇀ422ई485ൻۯഗLjথ๭ഗLjࢅ๭݀ऐ้Ljሞد๼၍ዐLjࢇ๢ڦۉમዕ ܋ܔሞߛ੗੍ഗॲ࢔ᆶՂᄲLj޿ഗॲీ३ณݒพăᅺྺ422ኻሎႹᅃ߲ጺ၍ฉڦൻۯഗLjසࡕሏᆩዕ܋Ljഄ ኻᇑ੍ৎፌࢫথ๭ഗڦۉમ఍܋၎૶থăጺڦઠຫLjሞۉમڦଇ߲఍܋Lj485ۼႴᄲዕ܋ă ړਦۨዕ܋ڦૌ႙้Ljཚ׉ᄲ੊୯ڦᅺ໎๟ഗॲڦႠీႴ൱ࢅࡗඁڦᅺ໎ă༪ஃڦዕ܋रຍڦփཞૌ႙๟࿮ ዕ܋၍Ljೝႜዕ܋Lj኱ୁዕ܋Ljਸୟࠤቱԍࢺዕ܋LjਸĂ܌၍ࠤቱԍࢺዕ܋Ljࢅܠۅዕ܋Lj௅ᅃዕ܋रຍڦ ํᄓ๪հႚኤ௽କ422ڦᆶၳႠࢅ࿘ۨႠDŽक़থڦLj485Džăසࡕ૧ᆩ၎ඹᇀ485ڦഗॲࢅዕ܋रຍLj੗ᅜइ ڥૌຼڦ঳ࡕăܔᇀํᄓ๪ยԢLjᆩକ100؅100౹ఛ24-AWGڦມজۉમăൻۯഗTI AM26C31Cࢅথ๭ഗ AM26V32CLjݴ՚ཚࡗକ5Vڦࠃۉۉუࢅ๪࿒ူڦ֪๬ăߴ؜କڇ࿋ዕ܋रຍڦ൸၍Ljሞ൸၍ዐฉLjฉ௬ڦ հႚ๟ൻۯഗڦ๼෇Ljူ௬ڦհႚ๟থ๭ഗڦ๼؜ăྺକߴ؜ᇑد๼၍ݒพ၎࠲ڦۉუհႚLjڼᅃ߲൸၍ߴ ؜ڦ๟ۉમ๔܋ڦൻۯഗ๼؜հႚLjܸڼܾཉ൸၍ߴ؜କۉમ఍܋ᇑথ๭ഗ๼؜၎࠲ڦհႚă ۉፆࢅۉඹڦዕ܋ኵᆯ௅ْڦ๬ᄓߴ؜Ljڍໜጣဣཥڦփཞܸփཞăਉ߲૩ጱLjዕ܋ۉፆLjZTᆌړၭᇀ ༬ኙፆੇZOڦ20%LjഄኵڦՎࣅݔྷٗٷሀ90౹ఛڟ120౹ఛă඗ܸ࿢்ߴ؜କۉፆRDNLjRUPࢅRSڦඓۨ ֖੊ኵă 15422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cn ZHCA028 ROUTDIN RB RA DY DZ RD ࿮ዕ܋ ཮16ߴ؜କ࿮ዕ܋ڦ঳ࠓLj཮17ࢅ18ߴ؜କ࿮ዕ܋ཉॲူLj৑࠶ݒพሞথ๭ഗ๼෇ڦຕ਍໏୲๟200kbpsă ڍग़ඹ422থ๭ഗኻ܁؜๼෇ֶݴۉუࢅሞ๼؜܋ׂิᅃ߲࿮ሯำڦ႑ࡽă ཮16.ֶݴ࿮ዕ܋঳ࠓ ᆫۅ ൻۯഗኻႴ࢔ၭڦۉୁ৽੗ᅜሞথ๭ഗ܋ׂิ႑ࡽ ইگႊೌฉൻۯഗฉڦࠀ୲ࡼො ැথ๭ഗాևഐਸୟࠤቱԍࢺڦࠀీ฿ӨLj੗ᅜඓԍথ๭ഗڦ๼؜๟ᅃ߲੗ኪڦጒༀ ඍۅ ߛຕ਍د๼໏୲ཉॲူDŽᆌኻᆩሞຕ਍໏୲ၭᇀ200kbpsڦഗॲࢅ܌཰ዐDžLjᆯᇀփ೅ದڦ၍ፆੇܸ ׂิڦ႑ࡽݒพDŽැtr>4tdelay,ۉમփᆌණྺ๟د๼၍ăDž • – – – • – 16 422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cnZHCA028 DIN DZ DY ROUT DIN RA RB ROUT ཮17.ֶݴ࿮ዕ܋ൻۯ๼؜հႚ ཮18.ֶݴ࿮ዕ܋থ๭ഗ๼෇հႚ 17422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cn ZHCA028 ROUTDIN RB RA DY DZ ZT l D R R ೝႜዕ܋ ཮19ߴ؜କᅃ߲ۆ႙ڦ঳ࠓLjኄ߲঳ࠓ૧ᆩକᅃ߲ሞᇺ܋থ๭ഗ૶থֶݴ๼෇ڦፆੇ೅ದăස཮20ࢅ21໯ ๖Ljೝႜዕ܋੗ᅜԍኤ࿮ፆੇ฿ದࢅၩأݒพăኄ߲๬ᄓዐLjړ႑ࡽد๼໏୲ٳڟ1Mbps้Ljᆩᅃ߲100౹ ఛڦዕ܋ۉፆLjኻᆩକᅃ߲থ๭ഗă ཮19.ֶݴೝႜዕ܋঳ࠓ ጀ๥ǖZT=ZO ᆫۅ ݒพڦၩأǖߛຕ਍د๼໏୲ࢅ߸׊ڦۉમ ኧ׼ܠኧୟڦᆌᆩ ඍۅ ׊ڦ฻ᇆ׊܈ࣷᆅ෇ݒพ ࣷሺेൻۯഗڦࠀ୲ࡼොDŽᇑ࿮ዕ܋ڦ൧઄၎ԲDž ړൻۯഗ੣ှईথߛፆੇጒༀ้Ljփీԍኤথ๭ഗڦ๼؜ • – – • – – – 18 422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cnZHCA028 DIN DZ DY ROUT DIN RA RB ROUT ཮20.ֶݴժႜዕ܋ൻۯഗ๼؜հႚ ཮21.ֶݴժႜথ๭ഗ๼෇հ 19422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cn ZHCA028 ROUTDIN RB RA DY DZ ZT CT RD ঍ୁዕ܋ ړൻۯഗ߾ፕ้Ljᅺྺֶݴ๼؜๟ࢻցڦLj໯ᅜړᅃ߲๼؜تሞگۉೝጒༀLjଷᅃ߲৽ࣷتሞߛۉೝጒༀă ሞժႜ঳ࠓዐLjۉୁཚࡗዕ܋ۉፆٗߛۉೝڦ๼؜܋ୁၠگۉೝڦ๼؜܋ăሞ኱ୁዕ܋ᆩᅃ߲ۉඹࢅᅃ߲ۉ ፆLjᅜၩأ኱ୁٗᅃֶ߲ݴ๼؜܋ୁၠଷᅃֶ߲ݴ๼؜܋ă཮22ߴ؜କ૶থ཮ă඗ܸኄዖܮྔڦओݴჽ׿ࣷ ௽၂ইگد๼໏୲ă཮23ࢅ཮23ߴ؜କথ๭ഗ੗থ๴ڦ๼෇ࢅ๼؜հႚLjኄ߲থ๭ഗᆩକᅃ߲ZT=100౹ఛ ࢅᅃ100pFڦۉඹڦ঍ୁዕ܋ăํᄓ๪ڦ֪ଉዐLjຕ਍໏୲၌዆ሞ200kbpsăසࡕᆩټᆶܠ߲ൻۯഗ485ဣ ཥLj৽੗ᅜሞۉમଷᅃ܋ڦೝ࢚၍ฉݣዃଷᅃZTࢅCTă ཮22.ֶݴ኱ୁዕ܋঳ࠓ ጀ๥ǖA.ZT=ZO B.჋ስࢆ้ڦCTᅜՍڪၳ้क़׉ຕԲڇ࿋้क़क़߰ၭ ᆫۅ ൻۯഗࠀ୲ࡼොᇑժႜዕ܋၎Բᆶ໯ইگLjڍᇑ࿮ዕ܋൧઄၎Բ࣏๟Բডٷ ၍ݒพ୲३ၭ ැথ๭ഗాևڦ܏ਸࠤቱԍࢺഐዘᄲፕᆩLj੗ᅜඓԍথ๭ഗڦ๼؜ڦتሞᅃ߲੗ኪڦጒༀ ඍۅ ᆯᇀRC้क़׉ຕڦ٪ሞLjࣷ၌዆ፌٷຕ਍د๼໏୲ࢅۉમڦ׊܈DŽۆ႙ڦᆌᆩ๟ሞگ໏੦዆၍ฉDž • – – – • – 20 422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cnZHCA028 DIN DZ DY ROUT DIN RA RB ROUT ཮23.ֶݴACዕ܋ൻۯഗڦ๼؜հႚ ཮24.ֶݴACዕ܋থ๭ഗ๼෇հႚ 21422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cn ZHCA028 ROUTDIN RB RA DY DZ ZT RDN RUP VCC RD ܏ਸࠤቱԍࢺዕ܋ ۆ႙ڦ൧઄ူLjֶݴথ๭ഗᇑ܏ਸࠤቱԍࢺۉୟ๟૶থሞᅃഐڦăᅺُLjසࡕൻۯഗൻۯڦথ๭ഗتሞߛፆ ੇጒༀLjఫ஺থ๭ഗڦ๼؜ፌዕॽࣷ๟ᅃ߲੗ኪڦጒༀă඗ܸLjසࡕኻᆩᅃ߲ዕ܋ۉፆLjཚ׉൧઄ူLjথ๭ ഗ৽փምኧ׼܏ਸࠤቱԍࢺLjఫ஺Lj৽ႴᄲྔևڦฉઙࢅူઙۉፆăDŽ९཮25Džă ཮25.ֶݴ܏ਸࠤቱԍࢺዕ܋঳ࠓ ጀ๥ǖA.ZT=ZO B.჋ስ၎ڪڦRUPࢅRDNLjኄᄣথ๭ഗڦֶݴ๼؜዁ณ৽ᆶ200mVڦۉუă සࡕᆩܠ߲ൻۯഗڦ485ဣཥLjఫ஺৽ᆌړሞۉમڦଷᅃ܋੍ৎൻۯഗڦೝ࢚၍ฉݣዃZTăྺକࢇ๢ڦፆ ੇ೅ದLjZTՂႷሺेLjኄ๟ᅺྺൻۯഗ३ၭڦڪၳፆੇװۉፆ༱܈Վࣅăස཮25Lj RUP܌থᇀںDŽሞAC ཉॲၭDžă ํᄓ๪ڦ֪๬ዐLjړZT=100౹ఛ้Ljฉઙࢅူઙۉፆݴ՚ۼ๟820౹ఛăٗൻۯഗੂࡗඁLjRUPLjRDNLjZTڦ ڪၳፆੇᇑۉમڦ༬ኙፆੇZOփ೅ದLjڍ໲்ڦኵᆌ޿๟༬ኙፆੇኵڦ20%ᅜాă཮26ࢅ27ߴ؜Ljړຕ਍ د๼໏୲๟1Mbps,჋ൽࢇ๢ڦዕ܋Ljׂิڦհႚ๟੗ᅜথ๴ڦă ᆫۅ ړൻۯഗ๟੣ှईுᆶ૶থጒༀ้Lj੗ᅜ๑ڥཚࡗথ๭ഗ๼෇ڦVID዁ณྺ200mVLjኄᄣ੗ᅜඓԍ๼ ؜๟੗ᅜᇨኪڦጒༀă ඍۅ ൻۯഗ޶ሜሺेࣷेٷൻۯഗ๼؜ࠀ୲ڦၩࡼ ߛࠀ୲ࡼො ߸ณ๢ᆩᇀথ๭ഗڦU.L.s • – • – – – 22 422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cnZHCA028 DIN DZ DY ROUT DIN RA RB ROUT ཮26.ֶݴ܏ਸࠤቱԍࢺዕ܋ൻۯഗ๼؜հႚ ཮27.ֶݴ܏ਸࠤቱԍࢺዕ܋থ๭ഗ๼෇հႚ 23422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cn ZHCA028 ROUTDIN RB RA DY DZ RDN RUP ZT RS RS RD ܏ୟࢅ܌ୟ฿ၳዕ܋ ሞമ௬ߴ؜ڦ঳ࠓዐLjසࡕሞۉમగتֶݴ๼؜ᆶ܌ୟLjఫ஺থ๭ഗ৽ࣷথ๭ڟ0VLjഄࢫ৽փీڥ؜๼؜໯ تڦጒༀă཮28ߴ؜ڦ๟ሞথ๭ഗ๼෇܋े෇କܮྔڦۉፆLjᅜၩأኄ߲࿚༶ă ཮28.ֶݴਸ/܌ୟࢅ฿ၳዕ܋঳ࠓ ኄ߲঳ࠓᆩᇀܱଝ࣍ৣăऺ໙ዕ܋ۉፆ้ᆌᆩब߲၌዆ཉॲăڼᅃLjසࡕሞጺ၍ฉ༑֪ڟ܌ୟDŽܸٗڥڟ ޶ڦZTDžLjఫ஺Ⴔᄲሞথ๭ഗڦ๼෇܋ݣዃᅃ߲ٷᇀRSଇԠڦڪၳۉፆă჋ስକRSLjఫ஺RUPࢅRDNൻۯ዁ณ 20mV๼෇ևݴ৽ுᆶઓవăڼܾLjᅃڋጺ၍৊෇ߛፆੇጒༀLj৽੗ᅜሞথ๭ഗ܋ڥڟZTࢅଇ߲RSز૴ڦڪ ၳۉፆLjཞ้LjRUPॽഄዐᅃ߲থ๭ഗฉઙ዁VCCLjॽଷྔᅃ߲ူઙ዁ںă჋ስRUPࢅRDN৽ࣷሞথ๭ഗڦ๼ ෇܋ׂิ዁ณ200mVڦۉუăፌࢫᅃ߲၌዆৽๟د๼၍ڦ༬ኙፆੇᆌړڪᇀZTLjZTྺRSࢅRUPڦଇԠDŽ्ย RUP=RDNDžă සࡕᆌᆩܠ߲ൻۯഗڦ485ဣཥLjఫ஺ሞۉમ఍܋ڦೝ࢚၍ฉᆌړݣዃଷᅃ߲ZTăྺକࢇ๢ڦፆੇ೅ದLj ሺेZTࢅ৽࢔ᆶՂᄲLjᇱᅺ๟ٗൻۯഗੂࡗඁ३ณڦڪၳፆੇ๟װ༱܈ՎࣅڦLjස཮28໯๖LjRUP܋থ዁ں DŽሞ঍ୁ൧઄ူDžă ํᄓ๪ڦ๬ᄓዐLjRUPࢅRDNݴ՚ൽ2ഥ౹LjRS=100౹ఛLjZT=100౹ఛăٗൻۯഗੂࡗඁLj੗ᅜڥ؜ZT,ଇ ԠRS,RUP,RDNۉፆྪஏڦڪၳۉፆLjኄ߲ڪၳۉፆᇑۉમڦ༬ኙፆੇZOժփྜඇ೅ದLjڍഄኵᆌړ๟༬ኙ ፆੇZOڦ20%ᅜాă཮29ࢅ30ߴ؜କຕ਍د๼໏୲ྺ1Mbpsଆࡻڦհႚă ᆫۅ ༵ࠃକ܏ਸ܌ୟࠤቱԍࢺ঳ࠓ থ๭ഗ੗ᅜ׶๴ߛڦᅃӯఇ๕ۉუݔྷă ඍۅ ࠀࡼٷ փ๢ᆩᇀ࿮၍ۉ๭݀ጎዃLjᇱᅺ๟RS٪ሞᇀൻۯഗ๼؜ཚୟዐ • – – • – – 24 422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cnZHCA028 DIN DZ DY ROUT DIN RA RB ROUT ཮29.ֶݴਸ/܌ୟ฿ၳዕ܋ൻۯഗ๼؜հႚ ཮30.ֶݴਸ/܌ୟ฿ၳዕ܋থ๭ഗ๼෇հႚ 25422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cn ZHCA028 ZTZT R R R D D D ZTZT 100 7 100 7 100 7 100 7 Logic Ground Chassis Ground D/RD/R ܠۅ๕ዕ܋ 485ኧ׼ܠۅ঳ࠓLj422փኧ׼ă཮31ߴ؜କᅃ߲ۆ႙ڦ485঳ࠓLj޿঳ࠓۉમڦଇ߲఍܋ټጣᅜ๭݀ऐጎዃ ࢅᄂጣۉમ׊܈ݣዃڦൻۯഗ/থ๭ഗăۉમଇ܋Lj485Ⴔᄲዕ܋DŽ९཮31Džăኄ߲঳ࠓփ༵ࠃհႚLjڍ੗ᅜ इڥᇑ੗ᇨ९ժႜዕ܋൧઄၎ૌຼڦႠీă ཮31.ֶݴܠۅ๕ዕ܋঳ࠓ ጀ๥ǖA:ZT=ZO ᆫۅ ᇑժႜዕ܋ᅃᄣ ፌᆫ႑ࡽዊଉ ඍۅ ໚඗ᇑժႜዕ܋၎ཞLjړႴᄲଇ߲ዕ܋ۉፆLjଇ߲ۉፆݴ՚ݣዃሞۉમڦ఍܋Ljኄࣷሺेൻۯഗ ڦ޶ሜă • – – • – থں૶থ ໯ᆶߴ؜ڦ࠲ᇀথں૶থڦ422ࢅ485ဣཥ঳ࠓۼுᆶॽݓ࣮႑ࡽ૶থ዁ںă࢔௽၂Ljᆶᅃ߲੗੍ڦথں๟ ࢔ᆶՂᄲڦLjኄᄣথ๭ഗࢅൻۯഗ৽ీࠕ࿮ဃڦཚ႑ă཮32ߴ؜କසࢆ૶থLjཞ้࿢்ॺᅱሞஇडࢅڹಎں ኮक़े෇ᅃၵۉፆLjኄᄣ৽੗ᅜՆ௨ܮྔڦথں࣍ୟۉୁăஇडںሞഄൻۯഗ዁থ๭ഗڦཚୟฉுᆶඪࢆۉ ፆăړሞᇺںኮक़ׂิᅃ߲ߛۉუ้Lj৽ᆶ؜၄യሞڦ࿚༶Lj༬՚๟تሞሡༀڦࡗײዐăᅺُLj࿢்ॺᅱሞ ᇺںኮक़থ෇ᅃၵۉፆă ཮32.থں঳ࠓ֖੊ 26 422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cnZHCA028 ZTZT† † 485-compliant system only D/R D/R D/R D/R ZTZT† † 485-compliant system only D/R D/R D/R D/R ۆ႙ဣཥ঳ࠓ Ԩবߴ؜ڦ๟Ljփཞ൧઄ူLj૶থೝ࿘ֶݴൻۯഗĂথ๭ഗࢅ๭݀ഗᅃӯ߁౒ăടړڦഗॲ૶থࣷ३ณ ݒพă ူ௬༪ஃڦဣཥ঳ࠓৈ๢ᆩᇀ485ဣཥยऺă੗ᅜ኱থገࣅ዁422ဣཥă६ᇀዕ܋ፆੇZTኻ๟੍ৎںLjᅃْݣ ዃᇀፌࢫᅃ߲থ๭ഗLjኄ߲থ๭ഗ࿋ᇀᇺ૗ൻۯഗڦۉમ఍܋ăཞᄣLjሞ422ဣཥยऺዐLjሎႹᆶגࡗ৵߲ ܮྔڦথ๭ഗLjৈႴᄲᅃ߲ൻۯഗन੗ă ᅃӯဣཥ঳ࠓ ፌ࠽ݘᆌᆩڦ૶থ঳ࠓ๟૾ጒ঳ࠓăྊ೫ბዐLj௅ᅃ߲በۅۼ๟৑੗ీڦ੍ৎ๼෇/๼؜৆ٙں૶থăኄዖၙ ݆๑ጺ၍ੂഐઠၟᅃཉد๼၍ă ཮33.૾ጒ঳ࠓ ࠡ߅঳ࠓ ࣏ᆶᅃ߲Բডୁႜڦ૶থ঳ࠓDŽස཮34໯๖DžLjॽበۅ኱থڦ૶থڟዷጺ၍DŽኸፕྺᅜ߲ࠡ߅Džăྺକ३ณ ၍ݒพLj๑܌၍DŽዷ߅၍ڦۉમਐ૗Dž৑੗ీڦ܌ăኄᄣፔڦణڦ৽๟ኸඟൻۯഗൻۯᅃཉد๼၍ă ཮34.૶থڟዷ߅ڦ܌ۉમ 27422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cn ZHCA028 ZTZT† † 485-compliant system only D/R D/R VOL(H) VDG ‡ ‡ D1 D2 D1 D2 VCCVCC QDN2 QUP QDN1 Driver 1 Driver 2 ‡ Parasitic diode ۅܔۅ঳ࠓ ۅܔۅڦ૶থස཮25໯๖Lj๟ຕ਍د๼ڦፌ०ڇႚ๕ă ཮35.ۅܔۅڦ૶থ Քጚኮक़ڦ०ᄲԲড සമ໯ຎLj422ࢅ485ᆶૌຼڦᄲ൱ՂԢڦཉॲă485ൻۯഗࢅথ๭ഗᅃӯ੗ᇑ422၎঍࣑Ljڍݒࡗઠփᅃۨ ႜڦཚă422ൻۯഗሞܠۅᆌᆩዐLj዁ณ٪ሞ3߲ٷڦ࿚༶ǖᅃӯఇ๕ݔྷLj၍߅ඡLj๼؜ൻۯۉୁă੊୯ړ ዁ณ2߲485ൻۯഗ૶থڟد๼၍ڦ൧઄DŽ९཮36DžăྺକݛՍ༪ஃLjኻߴ؜କଇ߲ൻۯഗă ཮36. 2߲485ൻۯഗ૶থ዁ጺ၍ 28 422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cnZHCA028 ᅃӯఇ๕ݔྷ ᆯᇀၰ༬एܾट࠶D1Ljසࡕसิܾट࠶DŽྔჽ֫ࢅתڹኮक़Džڦ๼؜ᆯᇀVDG>0.7Vگᇀ֖੊ں้Ljॽփీ ڞཚăཞᄣںLj૧ᆩၰ༬एܾट࠶D2DŽᇑD1ᅃഐDž੗ᅜ༵ࠃᅃӯఇ๕ݔྷǖ-7Vڟ12VLjLj๟7Vٗࠃᆌཚୟ ༵ࠃڦă422ൻۯഗுᆶኄၵ૶থڟۉୟڦၰ༬एܾट࠶LjᅺܸLj޿Քጚዐኻၘဦںຫ௽କ0.25Vࢅ6Vă ၍؋཭ සฉ໯ຎLj၍ඡ๟ړଇ߲ईܠ߲ൻۯഗཞ้ڞཚׂิڦăਉ߲૩ጱLjසࡕൻۯഗ1ڦQUPڞཚLjܸൻۯഗ 2QDN2ᄺڞཚLjఫ஺၍؋཭൧઄৽ࣷฉืăۆ႙ںLj422ൻۯഗுᆶాሞڦ၍؋཭ԍࢺLjᇱᅺ๟ኻᆶᅃ߲ൻۯ ഗă485ுᆶำ௽ᅃۨᄲ၍؋཭ۉୟLjڍٷܠຕൻۯഗᆶ׬ኮྺඤ܏ਸڦۉୟLj໲੗ᅜԍࢺ၍؋཭ăړඤ܏ ਸۉୟߌᆌڟߛ࿒้Lj৽ࣷཕኹ๼؜ൻۯഗڦ߾ፕăړഗॲՎૐ้Ljᆼਸ๔߾ፕăසࡕ၍؋཭ሞൻۯഗփ߾ ፕ๟ᅈ඗٪ሞLjఫ஺ඤ܏ਸ৽ࣷምْዕኹൻۯഗڦ߾ፕLj኱ڟ࿒܈ٳڟ༬ۨڦኵă၍؋཭٪ሞ้ăඤ܏ਸా ྔڦ๼؜ዜ೺๟փඓۨڦă ړᇺںኮक़ڦگۉ๞ჽฦ዁टٷኵĠ7V้(ස཮39໯๖ڦVGD)Lj၍؋཭ڦ࿚༶৽ܱࣷࣅăසࡕQDN2থ዁ںLj ഄԲᇺںگ7VLjఫ஺ሞQDN2ڦ๼؜܋৽ࣷ٪ሞٷሀ12VۉუăDŽ्ยVCC=5VDž.၄ሞ੊୯QDN1ࢅQDN2ڞཚڦ൧ ઄LjසࡕQDN2থ዁ںLjഄԲᇺںߛ؜7VLjఫ஺ሞQDN2܋৽ׂࣷิٷሀ-7Vڦۉუăړ֑ᆩ-7V዁12Vڦۉუݔ ྷ้Lj৽ၟമ௬༵ڟڦLj485Քጚ၌዆କ๼؜๼؜܋ڦۉୁăᅺُLjक़থںLjཚࡗ၌዆๼؜ۉୁLjኄ߲Քጚ Ⴔᄲڦ၍؋཭ლ኷ă 29422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cn ZHCA028 PARAMETER 422 485 UNIT Number of drivers and receivers 1 driver10 receivers 32 U.L.s Maximum theoretical cable length 1200 1200 m Maximum data rate 10 10 Mbps Maximum common-mode voltage p7 12 to –7 V Driver differential output level 2 b \VOD\ b 10 1.5 b \VOD\ b 5 V Driver load r100 r60 7 Driver output short-circuit current limit 150 to GND 150 to GND250 to –7 V or 12 V mA High-impedance state, power off 60 12 k7 Receiver input resistance 4 12 k7 Receiver sensitivity p200 p200 mV TECHNIQUE POWERDISSIPATION OPEN-LINE FAIL-SAFE SHORTED-LINE FAIL-SAFE SPEED SIGNAL INTEGRITY No termination Low Supported ifavailable on receiver Not supported Low Poor at high speeds Parallel termination Medium Not supported Not supported High Excellent AC termination Low Supported ifavailable on receiver Not supported Medium Good Open-line fail-safe termination High Supported Not supported High Excellent Open-line and shorted-line fail-safe termination High Supported Supported High Excellent Multipoint termination Medium Not supported Not supported High Excellent ൻۯۉୁ ᅺྺ485Ⴔᄲଇ߲ዕ܋ۉፆLjܸ422ኻႴᄲᅃ߲ዕ܋ۉፆLj485ڦۆ႙๼؜࢔ഽă߸ৎᅃօຫLj422ሎႹൻۯ גࡗ10߲4ഥ౹ఛڦ޶ሜDŽڪၳྺ400౹DžLjܸ485ሎႹൻۯגࡗ32߲12ഥ౹ఛڦ޶ሜDŽڪၳྺ375౹ఛDžă ᅺُLj၎ཞڦ๼؜ൻۯഽ܈ူLj485ൻۯഗీࠕൻۯ3Ԡڦ޶ሜDžă ՗3߁ઔକ422ࢅ485ኮक़ڦዷᄲֶᅴǗ՗4߁ઔକঢ়༪ஃڦඪᅃዕ܋रຍڦ༬ኙă ՗3. 485ࢅ422ࡀݔڦ०ᄲԲড ՗4.ዕ܋रຍڦ߁ຎ 30 422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cnZHCA028 ጺ঳ ৑࠶422ࢅ485ኮक़٪ሞጣ၎ຼႠLjӲ཮ยऺኁՂႷ੊୯ഄዐ௽၂ڦփཞLj޿ഗॲ๢ᆩᇀన߲Քጚăኄ߲ᆌ ᆩԒߢଚ؜କዷᄲڦփཞLjߴ؜କ֖੊૶থݛӄă485ഗॲ੗ᅜᆌᆩᇀ422ဣཥLjݒࡗઠඐփႜă TIߴ؜କٷଉ๢ᆩईփ๢ᆩ422ࢅ485ഗॲăTIዷᄲ৪ኛᆫ๞ሞᇀ੗ᅜ჋ስڦມटࢅມटCMOSֶݴഗॲ࢔ ܠă޿ഗॲॏ߭࢔ᆶᆫ๞LjሎႹӲ཮ยऺኁইگဣཥׯԨăܔᇀႴᄲ௅ᅃ߲Քጚڦ੗ᆩഗॲྜኝଚ՗Lj൩ݡ ࿚http://www.ti.com.cnׂ೗ᄻ௬ă 31422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cn ZHCA028 ׉९࿚ٴ TIፌ๴࣌ᆓڦ422/485ഗॲ๟నᅃ੼Ǜ ൻۯഗ/থ๭ഗܔSN75LS176B๟ణമၨ๳ፌࡻڦׂ೗Ljᇱᅺ๟ഄߛ໏ీ૰DŽٳڟ35MbpsDžࢅॏ߭ڦ ᆫ๞ă 422ࢅ485ഗॲࢅTIڦLVDSDŽ644Dž၎ԲසࢆǛ 422ࢅ485ഗॲᅙঢ়ᆶܠ౎ڦ૦๏LjरຍԲডׯຄăLVDS๟ႎೝ࿘ֶݴຕ਍د๼ݛӄLjኄ߲঳ࠓ߾ፕሞ 3.3VڦࠃۉڦཉॲူLjܸ422ࢅ485߾ፕۉუ๟5Văᇑ઻रຍ၎ԲLjLVDSਏᆶၭڦۉუհۯLjၭڦ๼෇ ଳ௺܈Ljߛڦټ੻ă 485ڦഗॲ੗ᅜᆩڟ422ዐ஘Ǜ ੗ᅜLjڍݒࡗઠփႜă ຕ਍د๼໏୲ࢅፌٷۉમ׊܈ڦ࠲ဣǛ ኄ߲࿚༶ሞTIຕ਍د๼ۉୟຕ਍๮֩ዐڦᆌᆩևݴ༪ஃࡗLj࿔၅Պࡽ๟SLLD001LjሞᆌᆩԒߢዐுᆶߴ ؜ăጺڦઠຫLjۉમሁ׊Lj໏܈ሁگLjᅺྺۉમ׊܈ࢅ႑ࡽد๼໏୲ׯݒԲ࠲ဣă 1. 2. 3. 4. 32 422ࢅ485Քጚ߁ຎࢅဣཥ঳ࠓ http://www.ti.com.cnZHCA028 ຍᇕ՗ BiCMOS ມटࢅࢻցূຌᄟࣅ࿿ӷڞ༹߾ᅝ bps Բ༬௅௱ Line contention ཞᅃጺ၍ฉ዁ณଇ߲ൻۯഗཞ้تᇀ߾ፕጒༀ LVDS گუֶۯ႑ࡽ Multidrop ڇ࿋ጺ၍ฉᅃ߲ൻۯഗൻۯܠ߲থ๭ഗ Multipoint ڇ࿋ጺ၍ฉܠ߲๭݀ഗLjൻۯഗLjথ๭ഗ U.L. ڇ࿋޶ሜ ௿ႇ ߌႇKevin GingerichࢅFrank Dehmelt༵ࠃरຍኧ׼LjߌႇTIࠅິڦߛपఇెׂ೗ፇ ֖੊࿔၅ ೝ࢚ۉუຕጴথ੨ۉୟڦۉഘ༬ႠLjANSI/TIA/EIA-422-B-1994Lj࿮၍ۉཚრ߾ᄽၹࣷLj1994 ೝ࢚ຕጴܠۅဣཥڦ݀ิഗࢅথ๭ഗڦۉഘ༬ႠLjANSI/TIA/EIA-485-A-1998Lj࿮၍ۉཚრ߾ᄽၹࣷLj1998 ANSI/TIA/EIA-485-AᆌᆩኸళLjTIA/EIA࿮၍ۉཚ႑ဣཥԒߢLj࿮၍ۉཚრ߾ᄽၹࣷLj1998 ֶۯዕ܋रຍڦԲডLjJoe Vo,ࡔॆӷڞ༹Lj֡ፕຫ௽AN-903 ܠۅᆌᆩዐڦEIA-485ࢅEIA-422၍ൻۯഗࢅথ๭ഗڦԲড ຕ਍د๼ยऺჺ৯֖ࣷ੊๮֩Lj1998LjڤዝᅏഗLj࿔၅ՊࡽSLLE01 ຕ਍د๼၍ۉୟຕ਍ກLj1998LjڤዝᅏഗLj࿔၅ՊࡽSLLD00 1. 2. 3. 4. 5. 6. 7. 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