ADI高速差分ADC驱动器设计考虑

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1、AN-1026ᆌᆩԴऻOneTechnologyWayíP.O.Box9106íNorwood,MA02062-9106,U.S.A.íTel:781.329.4700íFax:781.461.3113íwww.analog.comߛ໏ADCൻۯഗยऺ੊୯ፕኁǖJohnArdizzoniJonathanPearson०঻؜ᇀူ࿔༪ஃႴᄲLjሞُံ௽ඓᅃၵۨᅭăසࡕ๼෇ೝ࢚ܠຕ၄پߛႠీADCۼ૧ᆩ๼෇ઠᅞ዆ࠌఇሯำत߅႑ࡽLjVIPࢅVINᅜࠌཞएጚۉუྺቷLjഄఁᅭޗ܈၎ඡLjॽۉ܋෇๼߲ᅃLj้ࡽ႑܋ڇ෇๼ړăݒ၎࿋၎ĂڪႠ༹ጺߛ༵ࡽ႑࢚ೝࡗཚժ

2、LjԠ2ߛ༵ྷݔༀۯუࠦీă৑࠶ۨሞڍLjࡽ႑෇๼܋ڇ๴থᅜ੗CDAڦ෇๼ټLjଷᅃ๼෇܋ሶᅺഄܸՎࣅăଇዖ൧઄ူLj๼෇႑ࡽ਩๼෇႑ࡽ้LjADCڦႠీ֍ీٳڟፌॅጒༀăADCൻۨᅭྺVIP–VINăۯഗ—ཚ׉ยऺᆩᇀ༵ࠃُૌ႑ࡽڦۉୟ—ኴႜܠዖዘᄲఇ๼෇ۉუVIN,dmᅜतࠌఇ๼෇ۉუVIN,cmᆯڪ๕1ࠀీLjԈઔޗ܈໫ۙۙ฿ఇࠌĂ؋࣐Ă࣑ገ-܋ڇĂݣࢅڪ๕2ۨᅭăኝĂ୳հۯൻCDALjઠᅜ؜ླྀ8138DAጲăڪഗᅙׯྺຕ਍णဣཥዐՂփ੗ณۙࡽ႑ڦ૙ᇮॲăVIN,dm=VIP–VIN(1)RF1VIP+VINVIN,cm=(2)R2G1VA+VIP

3、VON–VIN,dmVOCMVOUT,dmܔᇀೝ࢚๼෇႑ࡽLj޿ࠌఇۨᅭᅃణକ඗Ljڍܔڇ܋๼෇–VINVOP+႑ࡽཞᄣᆶၳăRG2VARF208263-001๼؜ۉუཞᄣᆶఇࢅࠌఇଇዖLjᆯڪ๕3ࢅڪ๕4ۨ཮1.ݣٷഗᅭă཮1໯๖ྺᅃዖएԨڦඇۉუݒઍADCൻۯഗă੗९Ljഄᇑăᅴۅଇሞ٪ୟۉઍݒഗٷݣ໙ሏڦཥدVOUT,dm=VOP–VON(3)ADCൻۯഗܠᅃ߲๼؜ᆅগ(VON)ࢅ๼෇ᆅগ(VOCM)ăॽ႑VOP+VONVOUT,cm=(4)ࡽথ෇ټ๼෇܋ڦADC้Ljኄၵᆅগ੗ټઠटٷڦଳ2ऄႠă൩ጀᅪํा๼؜ࠌఇۉუVOUT,cmᇑVOCM

4、๼෇ᆅগኮLjࢫۉఇࠌ؜๼ۨඓᇀᆩኁࢅPOVሞ๟ܸLjࡽ႑؜๼܋ڇ๟փڦิഗۯൻCDAೝăVONኮक़ᅜVOCMྺ੊ิೝ࢚๼؜႑ࡽă(P՗๖ኟဆADCൻۯഗԲဆدཥሏ໙ݣٷഗᄲްሗڥܠăटLjN՗๖޶टă)๼෇܋VOCMᆩᇀ੦዆๼؜ࠌఇۉუăኻྺକ०ࣅپຕ๕Ljփݟۨᅭଇ߲ݒઍᅺጱβ1ࢅβ2Ljසڪ๕ᄲ๼෇ᇑ๼؜تᇀ߳ጲ၌܈ኮాLj๼؜ࠌఇۉუᅃۨڪᇀ5ࢅڪ๕6໯๖ăᆌᆩᇀVOCM๼෇܋ڦۉუă޶ݒઍࢅߛਸ࣍ሺᅮࣷ๑VA+ࢅVଇ߲ݣٷഗ๼෇ᆅগتڦۉუํाฉ၎ڪăRG1A–β=(5)1R+RF1G1RG2β=(6)2R+RF2G2Rev.0Informa

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