1. Mitemo yose
1.1 Iyo dhijitari, analog, uye DAA masaini wiring nzvimbo dzakafanopatsanurwa paPCB.
1.2 Digital uye analog zvikamu uye wiring dzinoenderana dzinofanira kuparadzaniswa zvakanyanya sezvinobvira uye kuiswa munzvimbo dzavo dze wiring.
1.3 Iyo yakakwirira-yekumhanya yedhijitari masiginecha anofanirwa kunge ari mapfupi sezvinobvira.
1.4 Chengetedza inocherekedza analog siginecha inoteedzera ipfupi sezvinobvira.
1.5 Kugoverwa kunonzwisisika kwesimba uye pasi.
1.6 DGND, AGND, uye munda zvakapatsanurwa.
1.7 Shandisa waya wakafara kune magetsi uye yakakosha masaini maratidziro.
1.8 Iyo dhijitari yedhijitari inoiswa padhuze neyakafanana bhazi/serial DTE interface, uye dunhu reDAA rinoiswa padhuze netambo yerunhare.
2. Kuiswa kwechikamu
2.1 Mune system yedunhu schematic dhizaini:
a) Govanisa dhijitari, analog, DAA maseketi uye matunhu ane hukama;
b) Kupatsanura dhijitari, analogi, yakasanganiswa yedhijitari / analogi zvikamu mudunhu rega rega;
c) Teerera pakumisikidzwa kwesimba remagetsi uye mapini echiratidzo cheiyo IC chip yega yega.
2.2 Chengetedza kupatsanura nzvimbo yewaya yedhijitari, analog, uye DAA maseketi paPCB (general ratio 2/1/1), uye chengeta madhijitari neanalogi zvikamu uye waya wazvo unoenderana kure sezvinobvira uye wodzimisa kune yavo. wiring nzvimbo.
Ongorora: Kana DAA redunhu richitora chikamu chikuru, pachave nekuwanda kwekutonga / chimiro chechiratidzo chinopfuura nepanzvimbo yayo yewaya, iyo inogona kugadziridzwa zvinoenderana nemirairo yenzvimbo, senge chikamu chepakati, kudzvanywa kwemagetsi, muganhu wazvino, nezvimwe.
2.3 Mushure mekunge chikamu chekutanga chapera, tanga kuisa zvikamu kubva kuConnector naJack:
a) Nzvimbo yeplug-in yakachengetwa yakatenderedza Connector uye Jack;
b) Siya nzvimbo yemagetsi uye pasi wiring kumativi ezvikamu;
c) Isa parutivi nzvimbo yeinoenderana plug-in yakatenderedza Socket.
2.4 Chekutanga nzvimbo dzakasanganiswa zvikamu (senge Modem zvishandiso, A/D, D/A shanduko machipisi, nezvimwewo):
a) Sarudza nzvimbo yekuisa yezvikamu, uye edza kuita kuti chiratidzo chedhijitari nemapini eanalogi atarise nzvimbo dzawo dzewaya;
b) Isa zvinhu panosangana dhijitari uye analog chiratidzo chenzira nzvimbo.
2.5 Isa zvese analog zvishandiso:
a) Isa analog sedunhu zvikamu, kusanganisira DAA maseketi;
b) Midziyo yeAnalog inoiswa padyo nemumwe uye inoiswa padivi pePCB inosanganisira TXA1, TXA2, RIN, VC, uye VREF masaini ekutsvaga;
c) Dzivisa kuisa zvikamu zvepamusoro-ruzha zvakapoteredza TXA1, TXA2, RIN, VC, uye VREF zviratidzo zvinotsvaga;
d) Kune serial DTE modules, DTE EIA/TIA-232-E
Iyo inogamuchira / mutyairi weiyo yakatevedzana masaini masaini anofanira kunge ari padyo sezvinobvira kune Connector uye kure neakakwira-frequency wachi chiratidzo routing kuderedza / kudzivirira kuwedzera kweruzha kudzvinyirira zvishandiso pamutsetse wega wega, senge coil coil uye capacitor.
2.6 Isa zvikamu zvedhijitari uye decoupling capacitors:
a) Izvo zvikamu zvedhijitari zvakaiswa pamwechete kuti kuderedze kureba kwewaya;
b) Isa 0.1uF decoupling capacitor pakati pemagetsi uye pasi peIC, uye chengetedza waya dzekubatanidza dzipfupi sezvinobvira kuderedza EMI;
c) Pamamodule ebhazi akaenzana, zvikamu zviri padyo kune mumwe nemumwe
Iyo yekubatanidza inoiswa pamucheto kuti ienderane neiyo application bhazi interface standard, senge kureba kweiyo ISA bhasi line inogumira ku2.5in;
d) Kune serial DTE modules, iyo interface yedunhu iri padyo neConnector;
e) Iyo crystal oscillator circuit inofanirwa kunge iri padyo sezvinobvira kune yayo yekutyaira mudziyo.
2.7 Iwaya dzepasi dzenzvimbo imwe neimwe dzinowanzobatanidzwa pane imwe kana imwe nzvimbo ine 0 Ohm resistors kana mabheji.
3. Signal routing
3.1 Mumasaini emodemu, mitsara yechiratidzo inowanzoitika kune ruzha uye mitsetse yezviratidzo inogona kukanganiswa inofanira kuchengetwa kure sezvinobvira.Kana zvisingadzivisiki, shandisa mutsara wechiratidzo chekuzviparadzanisa.
3.2 Iyo yedhijitari chiratidzo wiring inofanira kuiswa munzvimbo yedhijitari yedhijitari wiring nzvimbo zvakanyanya sezvinobvira;
Iyo analogi yechiratidzo wiring inofanira kuiswa munzvimbo yeanalog chiratidzo wiring zvakanyanya sezvinobvira;
(Isolation traces inogona kufanoiswa kudzikamisa kudzivirira maronda kubva kunze kwenzvimbo yenzira)
Digital siginecha inoteedzera uye analogog masaini maratidziro ari perpendicular kuderedza muchinjiko-kubatana.
3.3 Shandisa zviteshi zvega (kazhinji pasi) kuvharira masaini eanalogi kune iyo analogi chiratidzo chekufambisa nzvimbo.
a) Iyo yakasarudzika pasi inoteedzera munzvimbo yeanalogi yakarongwa pamativi ese ePCB board yakatenderedza analog chiratidzo wiring nzvimbo, ine mutsara wakafara we50-100mil;
b) Nzvimbo dzakatsarukana dzepasi munzvimbo yedhijitari dzinofambiswa dzakatenderedza nzvimbo yedhijitari yewaya pamativi ese ePCB board, ine mutsara wakafara we50-100mil, uye hupamhi hwerutivi rumwe rwebhodhi rePCB hunofanira kuita 200mil.
3.4 Parallel bus interface signal line width > 10mil (kazhinji 12-15mil), yakadai se /HCS, /HRD, /HWT, /RESET.
3.5 Mutsara wehupamhi hweanalog chiratidzo chekutsvaga> 10mil (kazhinji 12-15mil), yakadai seMICM, MICV, SPKV, VC, VREF, TXA1, TXA2, RXA, TELIN, TELOUT.
3.6 Zvimwe zvese zviratidzo zvechiratidzo zvinofanira kunge zvakafara sezvinobvira, upamhi hwemutsara hunofanira kuva> 5mil (10mil muhuwandu), uye mitsara pakati pezvikamu inofanira kuva pfupi sezvinobvira (kufanofungisisa kunofanira kutariswa paunenge uchiisa zvishandiso).
3.7 Mutsara wakafara we bypass capacitor kune inoenderana IC inofanira kuva> 25mil, uye kushandiswa kwevias kunofanira kudziviswa sezvinobvira.3.8 Mitsetse yechiratidzo inopfuura munzvimbo dzakasiyana-siyana (zvakadai seyakajairika pasi-speed control/status signals) inofanira kudziviswa. pfuura nepawaya dzepasi dziri dzoga pane imwe nguva (inodiwa) kana mapoinzi maviri.Kana iyo trace iri kudivi rimwe chete, iyo yakasarudzika yepasi trace inogona kuenda kune rimwe divi rePCB kusvetuka chiratidzo chechiratidzo uye ichiramba ichienderera.
3.9 Dzivisa kushandisa makona makumi mapfumbamwe-madhigirii epamusoro-frequency chiratidzo chekufambisa, uye shandisa yakatsetseka arcs kana 45-degree makona.
3.10 High-frequency signal routing inofanira kuderedza kushandiswa kuburikidza nekubatanidza.
3.11 Chengetedza ese masaini anoteedzera kure nekristaro oscillator wedunhu.
3.12 Pakufambiswa kwechiratidzo chepamusoro-soro, nzira imwe chete inoenderera inofanira kushandiswa kudzivirira mamiriro ezvinhu apo zvikamu zvakati kuti zvekufambisa zvinotambanukira kubva pane imwe nzvimbo.
3.13 Mudunhu reDAA, siya nzvimbo inokwana 60mil yakatenderedza peforation (ma layers ese).
4. Simba rekupa
4.1 Sarudza hukama hwekubatanidza simba.
4.2 Munzvimbo yedhijitari yedhijitari wiring, shandisa 10uF electrolytic capacitor kana tantalum capacitor inoenderana ne 0.1uF ceramic capacitor wozoibatanidza pakati pemagetsi uye pasi.Isa imwe pamagumo emagetsi ekupinda uye kumagumo ePCB board kudzivirira magetsi spikes anokonzerwa nekukanganiswa kweruzha.
4.3 Pamabhodhi ane mativi maviri, muchikamu chakafanana seyemagetsi anopedza simba, anokomberedza dunhu nemagetsi emagetsi ane mutsara wakafara we 200mil kumativi ose maviri.(Rimwe divi rinofanirwa kugadziriswa nenzira yakafanana neyedhijitari pasi)
4.4 Kazhinji, magetsi emagetsi anotanga kuiswa, uye ipapo zviratidzo zvechiratidzo zvinoiswa.
5. pasi
5.1 Mubhodhi rine mativi maviri, nzvimbo dzisina kushandiswa dzakatenderedza uye pazasi pedhijitari uye analogi zvikamu (kunze kweDAA) dzakazadzwa nenzvimbo dzedhijitari kana analogi, uye nzvimbo dzakafanana dzechikamu chimwe nechimwe dzakabatanidzwa pamwe chete, uye nzvimbo dzakafanana dzezvikamu zvakasiyana. yakabatanidzwa kuburikidza neakawanda vias : Iyo Modem DGND pini yakabatana kune yedhijitari yepasi nzvimbo, uye iyo AGND pini yakabatana kune analog pasi nzvimbo;iyo yedhijitari yepasi nzvimbo uye iyo analog yepasi nzvimbo inoparadzaniswa neyakajeka gap.
5.2 Mune mana-layer board, shandisa dhijitari uye analog pasi nzvimbo kuvhara madhijitari uye analogi zvikamu (kunze kweDAA);iyo Modem DGND pini yakabatana nenzvimbo yedhijitari yepasi, uye pini yeAGND yakabatana kune iyo analog pasi nzvimbo;nzvimbo yedhijitari yepasi uye nzvimbo yeanalogi yepasi inoshandiswa yakaparadzaniswa negomba rakananga.
5.3 Kana EMI sefa ichidikanwa mudhizaini, imwe nzvimbo inofanirwa kuchengetwa pane interface socket.Mazhinji EMI zvishandiso (beads/capacitors) anogona kuiswa munzvimbo iyi;yakabatana nayo.
5.4 Simba rekupa yega yega inoshanda module inofanira kuparadzaniswa.Functional modules inogona kugoverwa mu: parallel bus interface, kuratidza, digital circuit (SRAM, EPROM, Modem) uye DAA, etc. Simba / pasi yemodhi yega yega inoshanda inogona kungobatanidzwa panzvimbo yesimba / pasi.
5.5 Kune serial DTE modules, shandisa decoupling capacitors kuderedza simba rekubatanidza, uye ita zvimwe chete kumatambo efoni.
5.6 Iwaya yepasi yakabatana kuburikidza nepoindi imwe, kana zvichibvira, shandisa Bead;kana zvichidikanwa kudzvinyirira EMI, bvumira waya yepasi kuti ibatane mune dzimwe nzvimbo.
5.7 Waya dzose dzepasi dzinofanira kunge dzakafara sezvinobvira, 25-50mil.
5.8 Iyo capacitor inoteedzera pakati pese IC magetsi / pasi inofanira kunge ipfupi sezvinobvira, uye hapana nemaburi anofanira kushandiswa.
6. Crystal oscillator circuit
6.1 Mitezo yose yakabatana nemagetsi ekupinza / kubuda kwekristal oscillator (yakadai seXTLI, XTLO) inofanira kunge yakapfupika sezvinobvira kuderedza kukanganiswa kweruzha uye kugovera capacitance paCrystal.Iyo XTLO trace inofanirwa kunge ipfupi sezvinobvira, uye kona yekukotama haifanirwe kunge iri pasi pe45 degrees.(Nekuti XTLO yakabatana nemutyairi ane kukurumidza kusimuka nguva uye yakakwirira ikozvino)
6.2 Hapana dhizaini yepasi mubhodhi rine mativi maviri, uye tambo yepasi yekristaro oscillator capacitor inofanira kubatanidzwa kune mudziyo netambo pfupi yakafara sezvinobvira.
Iyo DGND pini iri padyo nekristaro oscillator, uye kuderedza nhamba yevias.
6.3 Kana zvichibvira, gadzira bhokisi rekristaro.
6.4 Batanidza 100 Ohm resistor pakati pepini yeXTLO necrystal/capacitor node.
6.5 Ivhu rekristaro oscillator capacitor rakabatana zvakananga kune GND pini yeModemu.Usashandise nzvimbo yepasi kana mitsara yepasi kuti ubatanidze capacitor kune GND pini yeModem.
7. Yakazvimirira Modem dhizaini uchishandisa EIA/TIA-232 interface
7.1 Shandisa kese yesimbi.Kana ganda repurasitiki richidikanwa, foil yesimbi inofanirwa kunamirwa mukati kana kuti conductive material inofanirwa kumwayiwa kuderedza EMI.
7.2 Isa Chokes epateni imwe chete patambo yemagetsi yega yega.
7.3 Izvo zvikamu zvinoiswa pamwe chete uye pedyo neConnector yeEIA/TIA-232 interface.
7.4 Yese EIA/TIA-232 midziyo yakabatana yega kune simba/pasi kubva kusimba remagetsi.Iko kunobva simba/pasi kunofanirwa kunge kuri kwemagetsi ekuisa terminal pabhodhi kana chinobuda cheiyo voltage regulator chip.
7.5 EIA/TIA-232 tambo chiratidzo pasi kusvika padhijitari pasi.
7.6 Muzviitiko zvinotevera, EIA/TIA-232 cable shield haidi kubatanidzwa kuModem shell;isina chinhu kubatana;yakabatana nedhijitari pasi kuburikidza nebhedhi;iyo EIA/TIA-232 tambo yakabatana zvakananga kune ivhu redhijitari kana mhete yemagineti yakaiswa pedyo negoko reModemu.
8. Iyo wiring yeVC uye VREF circuit capacitors inofanira kuva shoma sezvinobvira uye iri munzvimbo isina kwayakarerekera.
8.1 Batanidza iyo yakanaka terminal ye10uF VC electrolytic capacitor uye 0.1uF VC capacitor kune VC pini (PIN24) yeModemu kuburikidza netambo yakasiyana.
8.2 Batanidza iyo negative terminal ye10uF VC electrolytic capacitor uye 0.1uF VC capacitor kune AGND pin (PIN34) yeModemu kuburikidza neBead uye shandisa yakazvimirira waya.
8.3 Batanidza iyo yakanaka terminal ye10uF VREF electrolytic capacitor uye 0.1uF VC capacitor kuVREF pini (PIN25) yeModemu kuburikidza newaya yakaparadzana.
8.4 Batanidza iyo yakaipa terminal ye10uF VREF electrolytic capacitor uye 0.1uF VC capacitor kune VC pini (PIN24) yeModemu kuburikidza neyakazvimiririra trace;cherechedza kuti yakazvimiririra kubva ku8.1 trace.
VREF ——+———+
┿ 10u ┿ 0.1u
VC ——+———+
┿ 10u ┿ 0.1u
+——–+—–~~~~~—+ AGND
Bead inoshandiswa inofanira kusangana:
Impedance = 70W pa100MHz ;;
rated current = 200mA;;
Kunyanya kupikisa = 0.5W.
9. Foni uye Handset interface
9.1 Isa Choke painterface pakati peTip neRing.
9.2 Nzira yekubatanidza mutsara wefoni yakafanana neyemagetsi, uchishandisa nzira dzakadai sekuwedzera inductance musanganiswa, choke, uye capacitor.Zvisinei, kubviswa kwetambo yefoni kunonyanya kuoma uye kunonyanya kukosha kudarika kubviswa kwemagetsi.Iyo yakajairika tsika ndeyekuchengetedza zvinzvimbo zvezvishandiso izvi kuti zvigadziriswe panguva yekuita / EMI bvunzo chitupa.
Nguva yekutumira: May-11-2023