AN-669 ᆌᆩԴऻ One Technology Way t P.O. Box 9106 t Norwood, MA 02062-9106 t Tel: 781/329-4700 t Fax: 781/326-8703 t www.analog.com ᆶၳں๑ᆩAD628ሺᅮఇ ፕኁǖMoshe Gerstenhaber ࢅ Charles Kitchin ० AD628ᅜፕྺֶݴ/Բ૩ٷݣഗईኁᆅগӿۨڦሺᅮ ఇ๑ᆩăAD628༬՚ኍܔఇຕገ࣑ഗڦമۉ܋ୟܸย ऺLjݥࢇፕྺԲ૩ࢅ࣐؋ٷݣഗ๑ᆩăፕྺֶݴ ٷݣഗLjీٗፌߛڟ±120 Vࠌٷڦఇۉუዐ༵ൽၭֶڦ ۉݴუăፕྺᇨހጎሺᅮఇLjAD628ڦᆅগᅜԥ ӿۨഐઠ༵ࠃڦྷݔඓሺᅮLjኄᄣᅜႜߛ܈ ຕ֑णLjबࢭுᆶሺᅮईኁ฿ۙᅎă AD628๑ᆩਨܔፌณྔڦথഗॲăഄၭ႙MSOPހጎ ׇฉ༵ࠃኄၵࠀీڦഗॲዐ٫ፌၭڦăਏᆶߛሺᅮ܈ ࢅگᅎڦཞ้LjAD628༵ࠃࠌڦߛݥఇᅞLjཚሞ1 kHz้ࠌఇᅞԲٷᇀ90 dBLjሞ100 kHz้ࠌఇᅞԲධԍ ሞ60 dBă AD628ᆶᅃ߲VREFᆅগᆩᇀྺۉڇᇸADC༵ࠃୁ)ዐक़ۉ ೝ*ೋዃăሞኄዖᆌᆩዐLjV REF ᆅগᅜ०ںڇথڟ ADCۉ֖ڦუᆅগLjኄᄣᅜႜݛՍڦԲ୲๕߾ፕă ྺ๊ᄲ๑ᆩሺᅮఇICǛ ሞํा֪ଉ้Ⴔᄲٗሯำᇸዐ༵ൽෑ႑ࡽăฯሞႜֶ ֪ݴଉࢫLjߛࠌఇۉუධঢ়၄ăᆩڦਦݛӄ๑ ᆩሏ໙ٷݣഗLjईኁ߸ࡻݛڦӄ๑ᆩᅏٷݣഗLjࢫ ᆩگཚ୳հഗইگԝৠሯำۉೝă ኄዖدཥڦ݆ݛඍۅሞᇀݴ૬ሏ໙ٷݣഗۉୟࠌڦఇᅞ ႠీডֶLjڦۉუྷݔᄺጺၭᇀۉᇸۉუăړ๑ ᆩֶݴ႑ࡽᇸ้LjڇႊೌICڦᅏٷݣഗۉୟ༵ࣷߛࠌఇ ᅞႠీăܸLjᅏٷݣഗփీᆌ႑ࡽᇸٷᇀۉᇸࠃ ۉۉუईኁ႑ࡽ۠ेሞߛࠌఇۉუڦ൧ăଷྔLj๑ᆩྔ ևڇሺᅮۉፆڦᅏٷݣഗࣷ٪ሞሺᅮᅎăፌࢫLjگཚ ୳հཚႴᄲे܀ڦ૬ሏ໙ٷݣഗतഄᅃၵྔথഗ ॲăኄࣷၩࡼԐࡍۉڦୟӱक़ă ਏᆶԲ૩ٷݣഗࠀీڦAD628ၩأକሞߌدഗĂۉୁݴፆ ईኁഄຕ֑णۅᅜतADCኮक़ڦኄၵ९࿚༶ăڦ ፌٷ120VڦྷݔሎႹথ֪ଉٷ႑ࡽईኁ۠ेሞࠌٷ ఇۉუฉڦၭ႑ࡽă ਏᆶڇटگۅཚ୳հഗڦՔጚֶݴADC࣐؋ ഗۉୟ ස1๖LjAD628থڟᅃ߲۠ेሞࠌڦߛݥఇۉუฉ ݴֶڦ႑ࡽăAD628ሺᅮఇਏᆶଇ߲ాևٷݣഗă A1ࢅA2ăᆅগ3থ้ںLjሏ໙ٷݣഗA1ڦሺᅮ0.1ă100 k Ωۉፆࢅഄݛ௬ڦยऺԍኤAD628ీࠕت۠ेሞ ፌߛ±120 Vࠌڦఇۉუฉڦၭ႑ࡽă A1ڦཚࡗᅃ߲10 kΩۉፆথٷݣڟഗA2ڦኟ܋ă ᆅগ4ᅜথᅃ߲ྔևۉඹڟኄᅃۅLjኄᄣํ၄କڇटگ ཚ୳հă ߀ՎԲ૩ᅺጱ ස1๖Ljཚࡗ߀ՎٷݣഗA2ڦሺᅮᅜยዃAD628ڦ Բ૩ᅺጱăኄ߲ݥጆᆩሏ໙ٷݣഗᅜሞٷᇀڇ࿋ሺ ᅮڦඪࢆሺᅮኵူ߾ፕăAD628ᅜยዃٗ0.1ڟ1000ۉڦ ୟሺᅮă Rev. 0 | Page 1 of 8 AN-669 C1 +15V 0.1 μ F C FILTER 4 +VS 10kΩ DIFFERENTIAL INPUT SIGNAL 100k Ω 8 AD628 – IN 10kΩ A1 V IN 100k Ω 1 A2 RG V REF 2 5 – IN 10kΩ –V S V OUT TO ADC + IN + IN V CM 7 3 6 0.1 μF RF RG –15V 1. ਏᆶڇटگۅཚ୳հഗڦएԨֶݴথ ᆯᇀA1ڦሺᅮ0.1LjA1ᇑA2ڦፇࢇሺᅮڪᇀǖ ႑ࡽᅜADCڦྷݔዐक़ྺۅዐ႐ă1ฉ ±15 VLjڍۉୟᅜሞ±2.25 Vڟ±18 Vڦాྷݔມۉᇸࠃ ߾ူۉፕăኄ߲VREFᆅগᄺᅜᆩᇀۉڇᇸ߾ፕǗVREF ᅜೋዃྺVS/2ă VOUT = G = 0.1(1 + (RF / RG )) VIN ᅜǖ (10G-1) = ᆩᅃ߲ྔথۉፆඟAD628ڦሺᅮၭᇀ0.1 RF ස2๖LjAD628ሺᅮఇڦሺᅮᅜۙኝڟ0.01ڟ0.1ኮ क़ڦඪᅪኵă RG ኄ߲থݛ๕ᇑ1ڦۉྷݔୟᅃᄣLjኻᆅগ5ᇑ ᆅগ6ӿۨLjᆅগ4ཚࡗྔথۉፆRGথںăᆅগӿۨ๑ٷݣ ഗA2߾ፕሞڇ࿋ሺᅮူăۉፆRGAINᇑA1ాೌڦ܋10 kΩۉፆࠌཞፇׯᅃ߲ݴუഗLjᆩᅜປ३A1܋ᇑA2 ܋ኮक़ڦ႑ࡽăኄዖথݛ๕ڦሺᅮڪᇀ0.1 VIN ((10 kΩ + RG)/RG)ă ܔᇀADC࣐؋ڦᆌᆩLjA2ڦሺᅮᆌ๑ADCڦൻۉۯუথ ৎଉڦײྷݔăཚࡗྔথۉፆRFࢅRGยዃԲ ૩ᅺጱ)नA2ڦሺᅮ*ࣷ๑ኄၵۉፆጲวڦሺᅮࢅ܈ᅎ ႠీՎֶă ܀૬ڦVREFᆅগᅜྺAD628ڦ႑ࡽ༵ࠃೋዃLj๑ RG +15V 0.1 μF C FILTER 7 4 +VS 10kΩ DIFFERENTIAL INPUT SIGNAL 8 100k Ω AD628 – IN 10kΩ A1 V IN 1 100k Ω + IN A2 – IN 10kΩ V CM –V S 2 V REF 3 RG 6 0.1 μF –15V 2. ሺᅮၭᇀ0.1้AD628ڦথ Rev. 0 | Page 2 of 8 V OUT TO ADC + IN 5 AN-669 +15V C1 0.1 μF 0.1 μF C FILTER 7 4 +V S 10kΩ DIFFERENTIAL INPUT SIGNAL 8 V IN 1 AD628 100k Ω – IN 10kΩ A1 100k Ω + 5 A2 IN – 10kΩ V CM V OUT TO ADC + IN –V S 2 3 IN RG V REF 6 0.1 μ F C2 RG –15V RF 3. ມटگۅཚ୳հֶݴۉୟ ມटگۅཚ୳հݴֶڦۉୟ 3ዐۉڦୟᆩएԨڦADCথ੨ۉୟՎࣅܸઠڦăኄ Ljມटگۅཚ୳հཚࡗᅃ߲ेۉඹ(C2)ํ၄ă ၟኮമۉڦୟᅃᄣLjگཚ୳հഗڼڦᅃटۅཚࡗA1 ాڦ܋և10 kΩۉፆࢅྔևۉඹC1ํ၄ڦăܾڼटۅཚ ࡗሞA2ݒઍ࣮ୟฉڦᅃ߲ྔևRC้क़ຕํ၄ڦLjᆯ ժۉڦፆRFࢅۉඹC2ፇׯă൩ጀᅪLjᇑڇटگۅཚ୳հ ഗ၎ԲLjܾڼटీۅ๑ٷᇀRCገችೕ୲(1/(2πRC))ڦೕ୲ ߸ტࡐںইăܸLjໜጣೕ୲ڦሺेLjٷݣഗA2ڦ ሺᅮፌዕইڇڟگ࿋ኵժփࣷምᅃօ३ၭăᅜLj ሞೕ୲گᇀ–ڦ3 dBገች้ۅLjٷݣഗA2ۉڦუሺᅮᆯ RF/RGڦԲ૩ਦۨLjሞ߸ߛڦೕ୲้ྺڇ࿋ሺᅮă 10.0 OUTPUTVOLTAGE (V p-p) RT = 49.9kΩ, RG = 12.4kΩ C1 = 0.047μF, C2 = 0.01μF 4200 Hz –3 dBገችೕ୲୳ڦհഗᇑೕ୲࠲ڦဣă ٗገችೕ୲ٷڟሀ10Ԡገችೕ୲ాྷݔڦᆶݥ۸ോࡐڦ ইăሞኄ߲ೕ୲ۅᅜฉLjܾڼटۅփምᆶၳLjປ३୲ᇑڇ टۅၚᆌথৎă I ມटگۅཚ୳հഗ ྷݔǖ 10 V p-p F.S (5 V p-p) RF = 49.9 kΩ, RG = 12.4 kΩ –3 dBገችೕ୲ ۉඹ C2 ۉඹ C1 200 Hz 1 kHz 5 kHz 10 kHz 0.01 μF 0.047 μF 0.002 μF 0.01 μF 390 pF 0.002 μF 220 pF 0.001 μF II ມटگۅཚ୳հഗ ྷݔǖ20 V ރރኵLj5Vރރኵ RF = 24.3 kΩ, RG = 16.2 kΩ –3 dBገችೕ୲ 1.0 ۉඹ C2 ۉඹ C1 0.1 0.01 10 100 1k FREQUENCY (Hz) 10k 4. ມटگۅཚ୳հഗڦೕ୲ၚᆌ 100k 200 Hz 1 kHz 5 kHz 10 kHz 0.02 μF 0.047 μF 0.0039 μF 0.01 μF 820 pF 0.002 μF 390 pF 0.001 μF IࢅIIۆ႙୳հഗܔᇀփཞ–3 dBገችೕ୲ࢅଇ߲փཞ ଉڦྷݔײഗॲ֖ຕኵă֖ຕኵᅙঢ়ԥ຺ปྺՔጚۉ ፆࢅۉඹኵăۉඹC1ࢅC2ՂႷߛQኵگڦᅎഗॲǗփ ᄲᆩڪگप༩ٍۉඹăྺକፌڦگᅎࢅፌࡻॺڦ૬้ क़Ljླྀ४๑ᆩߛዊNPO༩ٍĂḇԋఈईḇԋఈۉ ඹă Rev. 0 | Page 3 of 8 AN-669 ᆩAD628ॺٲሺᅮఇ ํाڦຕ֑णဣཥႴᄲӝෑ႑ࡽڟٷݣፁࠕٷժ༵ࠃߴ ADCăփ႞ڦLjړԥದዃׯሺᅮఇ้Ljܠٷຕཚݣ ٷഗۼᆶሺᅮဃֶࢅ฿ۙᅎă ሞሏ໙ٷݣഗۉୟዐLjཚڦଇ߲ۉፆሺᅮยዃᆶࢅ܈ ᅎڦ၌ăړ๑ᆩဃֶྺ1%ڦՔጚۉፆ้Ljٷݣഗڦሺ ᅮࣷ३ณ2%ăᅺྺ߲ۉፆࣷۼᆶփཞڦᅎLjሺᅮᄺࣷ ໜጣ࿒܈ՎࣅăۉೌڇፆྪஏᆩᇀඓڦሺᅮยዃLjڍ ኄၵഗॲሺेକׯԨLjްሗۉࢅ܈ୟӱक़ă 5ڟ9ڦሺᅮఇۉୟਖ਼ޜକᆶኄၵႠీฉڦ၌Lj ᄺփࡍLjժڇMSOPڦਦݛӄăAD628ᆩፌၭ ڦICހጎ༵ࠃକྜኝీࠀڦăᆯᇀᆶۉڦፆۼሞAD628 ሺᅮఇాևLjࢅ܈ᅎኸՔࡻݥۼă ᆶኄၵᆅগӿۨۉڦୟ)࿄๑ᆩྔথഗॲ*ۼᆶࡻᇀ0.2% ڦሺᅮ܈Ljഄሺᅮ࿒܈ဣຕࡻᇀ50 ppm/°Că AD628ፕྺ+10ई–10ሺᅮఇ 5AD628ሺᅮఇIC༵ࠃۉუሺᅮྺ+10ۉڦୟ থăሺᅮఇᅜཚࡗᆅগӿۨईᆅগথںઠದዃփཞڦ ሺᅮăሺᅮఇԨวᆯଇ߲ాևٷݣഗፇׯǖᅃ߲ሺᅮྺ 0.1 ٷ ݣ ۯ ֶ ڦഗ (A1)त ࢫ ڦ ܋ᅃ ߲ ݥጆ ᆩ ࣐ ؋ ٷ ݣഗ (A2)ă ႑ࡽথڟVREFᆅগ(ᆅগ3)ࢅںኮक़ă႑ࡽথڟ ᆅগ3้LjA1ڦኟۉڦ܋უڪᇀVIN (100 kΩ/110 kΩ)Lj नVIN (10/11)ăᆅগ6থ้ںLjA2ڦڪ܋ᇀ0 Văᅺ ُLjA2ڦኟ܋ᄺࣷԥઠጲA2ݒڦ܋ઍഽྺ 0 VăA1ڦۨᄺཞ้ྺ0 VăA1ڦՂႷڪᇀA1 ڦኟLjᄺ৽ڪۼᇀVIN (10/11)ă ኄᅪ࿆ጣA2ڦۉუ(VOUT)ྺǖ VOUT = VIN (10/11)(1+100 k/10 k) = VIN (10/11) 11 = 10 VIN 6ዐڦದ༫ۉୟڦሺᅮྺ–10ăኄْLj႑ࡽথڟA2 ڦ(܋ᆅগ6)ࢅںă߾ፕᇱᅃᄣڦLjڍ႑ ࡽԥA2ገକ180°ăړᆅগ3থ้ںLjA1ڦኟ܋ 0 VLjA1܋ᄺࣷԥݒઍ࣮ୟഽྺଭăᆯᇀA1ڦሺ ᅮ1/10 (0.1)Lj ႴᄲA2ڦྺ10 VIN ഽA1ڦ ྺ܋0ă ଇዖথᆶփཞڦፆੇăړൻۯᆅগ3้)5*Ljںܔ ڦፆੇ110 kΩLjܸൻۯᆅগ6้)6*Ljںܔፆ ੇٷሀ50 GΩăኄ߲ۉୟ–ڦ3 dBܔټᇀ10mv႑ࡽ ٷሀ110 kHzLjܔᇀ100mV႑ࡽٷሀ95 kHză +15V 0.1μ F CFILTER 7 4 +VS 10kΩ 100kΩ 8 100kΩ 1 – + AD628 IN A1 10kΩ + IN A2 IN – IN 10kΩ –VS 2 3 VREF RG 6 0.1μ F –15V VIN 5. ྔথഗॲሺᅮྺ+10ۉڦୟ Rev. 0 | Page 4 of 8 5 VOUT AN-669 +15V 0.1μF CFILTER 7 4 +VS 10kΩ 100kΩ 8 100kΩ 1 AD628 – IN 10kΩ A1 + + IN IN A2 5 – IN 10kΩ –VS 2 3 RG VREF VOUT 6 0.1μF –15V VIN 6. ሺᅮྺ–10ڦದ༫ۉୟ ᅪLjኄ߲ۉزፆᇑٷݣഗA1ڦٷݥፆੇ၎Բᅜ ࢮփऺăٗᆅগ8ڟA1ڦ܋ሺᅮ0.1ăᅺُLjݒઍ ࣮ୟࣷഽA2ڦڪ܋ᇀ10 VINăኄ߲ۉୟ–ڦ3 dBټ ܔᇀ10mv႑ࡽٷሀ105 kHzLjܔᇀ100mV႑ࡽٷ ሀ95 kHză AD628ڦሺᅮยዃྺ+11 أକᆅগ1ᇑᆅগ3ӿܸۨփথںLjሺᅮྺ+11ۉڦୟ) 7*बࢭᇑሺᅮྺ+10ۉڦୟথ၎ཞăኄ๑থڟA1ڦኟ ڦ܋ଇ߲ాևۉፆ(100 kΩ ࢅ 10 kΩ)ժഐઠă၄ሞᅎ أକVINᇑA1ڦኟኮक़ڦ10 kΩ/110 kΩݴუഗăঢ়ࡗኄ ᄣۙڦኝLjV INཚࡗٷሀ9 kΩۉڦፆൻۯኟ܋ă൩ጀ 7 4 CFILTER +VS 10kΩ 8 1 100kΩ 100kΩ AD628 – IN 10kΩ A1 + + IN IN A2 – IN 10kΩ –VS 2 3 VREF RG 6 VIN 7. ሺᅮྺ+11ۉڦୟ Rev. 0 | Page 5 of 8 5 VOUT AN-669 AD628ڦሺᅮยዃྺ+1 ਏᆶമઍڦሺᅮྺ–9.91ټڦકቛሺᅮఇ 8AD628༵ࠃሺᅮྺ+1ۉڦୟথăᇑኮമᅃ ᄣLjኄ߲ۉୟথ๑ᆩሺᅮఇాևۉڦፆྪஏઠइߛڥ ሺᅮࢅ܈࿘ۨႠă 6ዐۉڦୟᅜฎྲႪ߀ཚࡗ๑ᆩณଉኟݒઍઠሺे ټڦLjස9ăཚࡗӝᆅগ4ࢅᆅগ1থሞᅃഐLjٷݣ ഗA1ڦമઍڟڦኟ܋ă၄ሞLjሺᅮ= –(10 – 1/11)= –9.91ă ႑ࡽথڟVREFᆅগࢅںኮक़ăᆯᇀᆅগ1ࢅᆅগ8 থڦںLj႑ࡽཚࡗ100 kΩ/110 kΩڦປ३ഗڟ A1ڦኟ܋ăۉუڪᇀVIN (10/11) = 0.909 VINăٗኄۅ ڟA1ڦ܋ሺᅮڪᇀ1 + (10 kΩ/100 kΩ) = 1.10ăᅺُLj A1ۉڦ܋უڪᇀVIN (1.10) (0.909) = 1.00ăA2ٷݣഗᅜ ڇ࿋ሺᅮ࣐؋ݛ๕߾ፕ)ᅺྺᆅগ5ࢅᆅগ6থሞᅃഐ*Lj ഄጺۉୟሺᅮྺ+1ă Ⴊ߀ࢫۉڦୟධ࿘ۨLjᅺྺኝ߲ۉୟᆶକٷଉݒڦઍ )ٗA2ڦڟ࣮܋A1ڦ*܋ăኄ߲ۉୟথڦၭ႑ ࡽ–3 dBٷټሀྺ140 kHzăኄԲ6ዐႪ߀മۉڦୟټڦ ሺेକ27%ăܸLjሺᅮ܈ইڟگକ±2%ă +15V CFILTER 7 4 +VS 10kΩ 100kΩ 8 1 AD628 – IN 10kΩ A1 100kΩ + IN + IN – 10kΩ –VS 2 0.1μ F VREF 3 VOUT A2 IN 5 RG 6 0.1μ F –15V VIN 8. ሺᅮྺ+1ڦAD628ۉୟ CFILTER +VS 10kΩ 8 1 100kΩ – 100kΩ AD628 IN 10kΩ A1 + + IN IN A2 – IN 10kΩ –VS 2 7 4 3 VREF RG 6 VIN 9. ਏᆶമઍۉୟڦሺᅮྺ–10ڦሺᅮఇ Rev. 0 | Page 6 of 8 5 VOUT AN-669 Rev. 0 | Page 7 of 8 AN-669 © 2003 Analog Devices, Inc. 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