AN-837 ᆌᆩԴऻ One Technology Way t P.O. Box 9106 t Norwood, MA 02062-9106, U.S.A. t Tel: 781.329.4700 t Fax: 781.461.3113 t www.analog.com एᇀDDS้ڦዓ۶ۯႠీᇑDACዘࠓ୳հഗႠీ࠲ڦဣ ፕኁǖDavid BrandonࢅKen Gentile ዘࠓ୳հഗٗথຕጴೕ୲ࢇׯഗ)DDS*ׂิ߅৫گڦ ۶้ۯዓ႑ࡽڦዘᄲևॲăዘࠓ୳հഗᆩᇀሞDACڦ ܋ປ३ၟೕ୲ăڍLj୳հഗ݆ሞ၌ೕ୲ྷݔ ాํ၄ၙڦፆټᅞăኄᆯഗॲसิၳᆌᅜतᆇຘۉ ୟӱքਆڦ၌ᆅഐڦăසࡕ࿄ీ๑ᆩਏᆶ؊ݴፆټ ᅞڦዘࠓ୳հഗLjీࣷইگDDSڦႠీă ADIࠅິ࣏༵ࠃದ༫ᆌᆩԴऻAN-823LjᆌᇑԨᆌᆩԴऻᅃ ཞፕྺ֖ă ୳հഗքਆํᄓ! ཚࡗᅜူࠅ๕Ljऺ໙ඪࢆႴၟೕ୲၎ܔᇀfOUTڦ ஃ)܈ޗdBc*Ljഄዐfၟೕ୲LjfCDAC֑ᄣ୲ǖ ๑ᆩDDSׂิ้ዓ႑ࡽ้LjDACၟೕ୲ປ३փፁࣷჹዘ ᆖၚဣཥዜႠ۶ۯႠీăሞ܈ޗፏთsin(x)/xၚᆌ൸၍ڦ ൧ူLjၟೕ୲ஃฉકቛ၌ೕ୲ă1๖ྺ DACೕă ԨᆌᆩԴऻถକᅃ߲୳հഗքਆํᄓڦࡕժ༪ஃքਆ ࢅഗॲስܔፆټᅞڦᆖၚăُํᄓ࠲ጀڦዘۅԨᆌ ᆩԴऻዐถڦෙዖLCگཚ୳հഗքਆLjन୳հഗAĂ୳ հഗBࢅ୳հഗCăෙዖ୳հഗሞᇮॲኵࢅႴၚᆌ༬Ⴀݛ ௬बࢭྜඇ၎ཞăํᄓణڦߵഗॲڦքਆࢅ ࠓ၌ۨํᄓՎଉྷݔڦă fOUT 0Hz fC – fOUT fC + fOUT 2fC – fOUT 2fC + fOUT fC 3fC – fOUT 2 fC 3 fC FIRST IMAGE SECOND IMAGE THIRD IMAGE FOURTH IMAGE SYSTEM CLOCK FREQUENCY (Hz) FIFTH IMAGE 3fC + fOUT SIXTH IMAGE 05956-001 SIGNAL AMPLITUDE sin x/x ENVELOPE x = π (f/fC) 1. DACೕ Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2006 Analog Devices, Inc. All rights reserved. AN-837 ణ ୳հഗքਆํᄓ ............................................................................. 1 ዘࠓ୳հഗڦዘᄲႠ ..................................................................... 3 ݴ૬LCگཚ୳հഗยऺ ............................................................... 3 ! ഗॲስ .................................................................................. 3 ݴ૬LCگཚྈᇶ୳հഗํڦ၄ ݆ݛ......................................... 3 ୳հഗํᄓࡕ ............................................................................. 4 ୳հഗᇱ .................................................................................. 7 ୳հഗڦଙൣ ڇ......................................................................... 7 PCB୳հഗքਆ୯ ..................................................................... 8 ஃ ................................................................................................... 8 Rev. 0 | Page 2 of 8 AN-837 ዘࠓ୳հഗڦዘᄲႠ 2๖ྺዘࠓ୳հഗ้֪ڦڥၟೕ୲ࠀ୲ă๖ ڦၟೕ୲ປ३ྜඇᆯDACڦsin(x)/xၚᆌᆅഐڦă ኄၵၟᆶ้ᆩፕ႑ࡽLjኄዖ൧ူႴᄲټཚ୳հഗLj ܸگݥཚ୳հഗăሞ2ڦೕ൸၍ዐLjDDS֑ᄣ้ዓ (fC)200 MHzLjfOUTยዃྺ10 MHză RBW VBW SWT 200kHz RF ATT 30d 20kHz 640ms UNIT dBm ݴ૬LCگཚ୳հഗยऺ 0 ݴ૬LCگཚ୳հഗํڦแׯԨডگLjժਏᆶডഽڦଳऄ Ⴀăٗഗॲስڦঙ܈ઠੂLjᄲํ၄ፌᆫڦཚࢅټፆټႠ ీLjံᄲስਏᆶডߛጲၿናೕ୲ࢅডߛQ༬Ⴀڦഗ ॲăਏᆶডߛQۨܮኵڦഗॲڦᆫۅഄزRኵডگă ሞگཚ୳հഗዐLjኄዖ༬Ⴀᅜ३ณ֭ڦߌۉزࡼ ժইگಖୟۉඹڦፆੇăስਏᆶߛQࢅߛጲၿናೕ୲ڦ ഗॲᅃၜᆶవڦ܈ඪခăᅃӯܸჾLjߵࠓॺۉඹࢅ ߌۉภतڦბᇱLjߛQࢅߛጲၿናೕ୲ྫྫࢻ ؈֖ຕăྺइڥፌॅႠీLjՂႷัስഗॲă –10 AMPLITUDE (dBm) –20 –30 –40 –50 –60 –70 –80 START 0Hz 100MHz STOP 1GHz ഗॲስ 05956-002 –90 –100 SAWĂৗናĂ༩ٍईᇨހጎLC୳հഗڪ၄ᆶ୳հഗࢇ ᆩፕዘࠓ୳հഗăڍLjስ୳հഗૌ႙ኮമLjᄲጮဦඓ ණ୳հഗሰฆڦຕ֩ዐࡀۨڦፆټᅞࢅ֭ ࡼăፆټᅞڦरຍࡀ߭๔ዕኍܔᆶ၌ࠃ༵ټăُټ ీࡗLj݆ඓۨޏᆩᇀঢ়ࡗકቛڦፆټᅞăኄ ዖ൧ူLjᄲሞፌዕስኮമඓණ୳հഗፆټႠీă 2. ዘࠓ୳հഗڦၟೕ୲๖૩ ُ൸၍(2)କ๑ᆩਏᆶ؊ݴፆټᅞڦዘࠓ୳հഗ ڦዘᄲႠă൩ጀᅪLjၟೕ୲ዐࡤᆶডీٷଉLjՂႷၩ أLjܸኄၜඪခᅈ੍୳հഗڦፆټႠీनྜׯăᅍڦ Ljሞํा֡ፕዐLjړೕ୲ᇺᇺגཚ้ټLj୳հഗڦፆ ټᅞႠీ৽ࣷူইăኄᆯݥၙഗॲࢅᆇຘۉୟӱ (PCB)ฉഗॲڦքਆᆅഐڦă૩සLjํा๑ᆩۉڦඹ ࢅߌۉժփྜඇਏᆶඹႠईߌႠă ස3๖Ljᅃዖఇ႙ԈઔፆႠ)R*ĂߌႠ)L*ࢅඹႠ )C*ᇮॲăᆯኄၵఇ႙၂ੂLj٪ሞᅃ߲ᆯLࢅCፇࢇ ࠓڦׯጲၿናഗॲࢅᅃ߲ᆯRᆅഐ֭ڦࡼഗॲă IDEAL MODE REAL MODEL (FIRST ORDER) C L C L R L ስ֭ࡼডၭڦഗॲሞ୳հഗڦٷ߸ࠃ༵܋႑ ࡽ܈ޗăڦ܈ޗইࣷگথᆖၚ႑ࡽڦუӦ୲ă༵ߛ থഗईೝݛഗڦუӦ୲ইټگሯำăැᄲၘဦ କ้Ⴞ۶ူৣ࣍ۯ႑ࡽڦ܈ޗዘᄲႠLj൩֖AN-823ă ݴ૬LCگཚྈᇶ୳հഗํڦ၄݆ݛ ᅃӯླྀ४๑ᆩྈᇶၚᆌ୳հഗईܻၚᆌ୳հഗፕྺLCگ ཚዘࠓ୳հഗăᇑഄၚᆌૌ႙၎ԲডLjሞߴۨްሗ)܈न ୳հഗຕ*ڦ൧ူLjྈᇶ୳հഗ༵ࠃፌڦཚټፆ ټገ࣑ă R 3. ၙఇ႙ᇑํाఇ႙ 05956-003 C ߳ഗॲڦጲၿናೕ୲ᆯᇮॲኵतഄࠓਦۨăስ ٫ডၭހڦጎཚডॅڦስăডၭހڦጎᅃӯਏᆶ߸ ߛڦጲၿናೕ୲ժ३ณᇑPCBքਆ၎࠲ڦसิၳᆌăܔᇀ ಖୟۉඹLj๑ᆩᇮॲኵৈྺᇱ๔ᇮॲኵᅃӷڦଇ߲ժ ۉඹॽጲၿናླྀ߸ߛڦೕ୲ăُरຍڦᆖၚሞ୳հഗํ ᄓࡕևݴዐᇎᅜຫă ᅺྺഗॲڦጽ၍ࡰಎኮक़٪ሞसิۉඹLjसิۉඹࣷᅪ क़ॽ႑ࡽ᳘ٗࢇLjᅜ୳հഗքਆࣷ၂ዸᆖၚ ፆټᅞăᄲํ၄ፌᆫڦፆټᅞLjႴᄲཞ้ܔഗॲስ ࢅքਆဦবेᅜ࠲ጀăೠࠚ୳հഗڦፆټႠీ้Ljᆌᅜᇺ גഄยऺገችೕ୲ڦೕ୲ႜ֪ଉLjᅜඓԍၟೕ୲ీ ڟڥ؊ݴᅞăॺᅱᆌሞೕ୲ڟٳຕഥቹࢍईณڟٳ5 fC ้࠵ִፆټᅞă Rev. 0 | Page 3 of 8 AN-837 5๖ྺժথĂĂྈᇶĂگཚLC୳հഗă 05956-005 ُ༬Ⴀ๑ྈᇶ୳հഗྺׯዘࠓ୳հഗڦၙݛӄă5 ๖ྺܻĂൎԲდސĂә༬ጦࢅԞܻኄ຺ዖएԨ୳հ ഗڦᅃፇਏᆶپႠڦၚᆌ൸၍ă! 0dB 5. ժথLC୳հഗ CHEBYSHEV AND CAUER PASS BAND RIPPLE –3dB MAGNITUDE (dB) ୳հഗํᄓࡕ 7၂๖କٗԈࡤ୳հഗAĂ୳հഗBࢅ୳հഗCํڦᄓ୳ հഗӱዐइڦڥࡕă߳൸၍ዐۥڦև൸၍୳հഗ֪ ڦڥೕ୲ၚᆌǗڹև൸၍ঢ়ࡗํᄓ୳հഗࢫDDSೠࠚӱ ֪ڦڥೕă CAUER CHEBYSHEV ֪ଉದዃස6๖ă BUTTERWORTH FREQUENCY PASS BAND CORNER FREQUENCY 05956-004 BESSEL DDS EVALUATION BOARD AVDD 4. ຺ዖएԨ୳հഗڦၚᆌ൸၍ 1:1 ADTT1-1 DDS AVDD EXPERIMENTAL FILTER BOARD SPECTRUM ANALYZER 05956-009 ྈᇶၚᆌీ༵ࠃ۸ോࡐইLjپڍॏཚࢅټፆټዐࣷ၄ ࿖հă൩ጀᅪLj5๖ཚټ࿖հྺ܈ޗڦໜᅪࣼLjৈ ᆩᇀᄇ๖ăྈᇶ୳հഗยऺዐవ௨ࣷ၄ᅃၵཚټ࿖ հLjڍ୳հഗยऺටᇵᅜ੦ڦᅃၜ֖ຕăᅺُLj ഄ܈ޗൽਦᇀਏ༹୳հഗยऺă! AVDD 6. ֪ଉದዃ ཚټ࿖հᆖၚగၵEETᆌᆩăሞሜհ႑ࡽׂิڇڪᅼᆌ ᆩዐLjཚټ࿖հժ࠲ݥ॰֖ຕăڍሞగၵᆌᆩዐLjࣷᆩ EETׂิۙሜհLjኄ้৽ՂႷॽཚټ࿖հྺ୳հഗย ऺ࠲ڦ॰ᅺ໎ă! ൩ጀᅪLjDDSೠࠚӱాዃᅃ߲ټሀྺ300 MHzڦ᳘ ࢇՎუഗăᅺُLjᆯᇀՎუഗڦၚᆌLjړೕ୲ߛᇀ300 MHz้Lj֪ڦڥೕዐ٪ሞྔܮປ३ă MD୳հഗߵൻۉۯୟୁۉᇸ࣏ۉუᇸܸྺݴଇዖႚ ๕ăසࡕᆯୁۉᇸൻۯLjሶڼᅃᇮॲྺժথLjܸܔᇀ ۉუᇸLjڼᅃᇮॲྺزথă ኄෙዖLCگཚྈᇶ୳հഗํڦ၄ݛӄPCBքਆࣷᆅഐ ၟᅞՎࣅăෙዖݛӄํ၄ۼڦ๑ᆩݴ૬LCഗॲڦ ĂྈᇶĂ160 MHzگཚ୳հഗă ߳൸၍ዐঢ়DDS୳հڦೕ୲ۼยዃྺ110.123 MHzLj DAC֑ᄣ୲ྺ500 MSPS)REFCLK*ă൩ጀᅪLjՎუഗ )Mini-Circuits®༵ࠃڦADTT1-1*ᅜֶݴႚ๕᳘ࢇDDS ăՎუഗᇑ୳հഗํ၄܋ڇথă Rev. 0 | Page 4 of 8 AN-837 FILTER LAYOUT C1 C2 C3 L1 C4 FILTER A C5 L2 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 C6 C7 C8 L3 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 C9 C10 C11 FILTER A RESPONSE 0Hz C1 L1 C2 C3 FILTER B L2 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 C4 C5 C6 L3 C7 C5 FILTER C L3 C7 L1 L2 C4 C6 C2 C3 DDS FILTERED OUTPUT 350MHz 3.5GHz FILTER B RESPONSE 0Hz 350MHz 3.5GHz DDS FILTERED OUTPUT IMAGES 0Hz C1 3.5GHz IMAGE 0Hz 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 350MHz 350MHz 3.5GHz 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 FILTER C RESPONSE 0Hz 350MHz 3.5GHz IMAGES DDS FILTERED OUTPUT 0Hz 350MHz 7. ୳հഗAĂ୳հഗBࢅ୳հഗCํڦᄓࡕ Rev. 0 | Page 5 of 8 3.5GHz 05956-006 FILTER BOARD AN-837 JitterUI peak to peak § N dBcn · 1 arctan¨¨ ¦10 20 ¸¸ ©n1 ¹ ُྔLj൸၍ժփภतໜऐ۶ۯ࿚༶LjഄၳᆌՂႷ܀ڇ ୯ă § dBc · 1 arctan¨¨10 20 ¸¸ ¹ © ഄዐLjdBc၎ܔᇀएհڦ܈ޗሗො܈ޗă ُࠅ๕൸၍ස8๖ă۶ۯ๖ྺރރኵڇ࿋क़߰ (UI)ăᅃ߲UIྺᅃ߲၎࠲้ዓ႑ࡽዜăᆩUI๖۶ۯLj ๑൸၍ᆩᇀඪᅪ้ዓ႑ࡽă૩සLjසࡕᅃ้߲ዓ ႑ࡽਏᆶ−35 dBcݥၿհሗොLjሶᅜᇨৈᆯሗොन ᆅഐሀ0.006 UIރރڦኵ۶ۯă ्้ۨዓೕ୲100 MHzLjሶ1 UIྺ10 nsLjᅺُܔᇀᅃ߲ 100 MHz ้ዓLj0.006 UIڪᇀ60 ps(0.006 × 10 ns)ă๑ᆩُ൸ ၍้Ljൎऻ۶ۯኵᆩᇀڇሗොݴଉă٪ሞ߲ܠሗො ้Ljമ๕๖ڦarctanࡧຕጲՎଉዐՂႷܔ߲ሗොࠋڦ ၅൱ࢅă Rev. 0 | Page 6 of 8 0.020 0.019 0.018 0.017 0.016 0.015 0.014 0.013 0.012 0.011 0.010 0.009 0.008 0.007 0.006 0.005 0.004 0.003 0.002 0.001 0 –25 –30 –35 –40 –45 –50 –55 –60 –65 –70 –75 –80 –85 SPUR MAGNITUDE (dBc) 8. ้Ⴞ۶ۯᇑሗො߅ඡ࠲ڦဣ 05956-007 JitterUI peak to peak ૩සLjᇑN߲ሗො၎࠲ރރڦኵ۶ࠅۯ๕සူǖ TIMING JITTER PEAK-TO-PEAK (dBc) 7๖୳հഗ֪ڦڥೕ୲ၚᆌྺ0 Hz3.5 GHz(֪ଉᅏഗ ڦೕ୲ฉ၌)ăܔᇀ1 GHz DDSLjॺᅱॽ֪ଉೕ୲કቛ3.5 GHzᅜฉLjᅜ߸ࡻںඓۨ୳հഗፆټၚᆌڦ༬Ⴀă ሞႴᄲटگ۶ڦۯᆌᆩዐLj؊ݴᅞDACၟೕ୲࠲ݥ ॰ăํाฉLjݥၿհೕሗො܈ޗڦᇑׂิڦዜႠ۶ ۯኮक़٪ሞথ࠲ဣLjࠅ๕සူǖ AN-837 ୳հഗᇱ ୳հഗڦଙൣ!ڇ FILTER A SCHEMATIC C2 5.6pF C1 5.6pF L1 39nH C3 12pF L2 56nH C5 12pF C4 12pF C6 6.8pF C8 15pF C7 15pF ୳հഗAڦଙൣڇස1๖Lj୳հഗBࢅ୳հഗCڦ ଙൣڇස2๖ăኄၵଙൣڇႴᄲጀᅪᅜူबۅǖ L3 68nH C9 2.2pF C11 10pF t ᆶଙڦຕଉྺ1ă C10 10pF t ᆶଙڦ٫ྺ0402ă t ᆶଙᆯዪ๕ࣷม٩གྷፕิׂă! FILTER B AND C SCHEMATIC C1 12pF C2 12pF L2 56nH C3 27pF C4 6.8pF L3 68nH C5 33pF C6 2.2pF C7 22pF 05956-008 L1 39nH 9. ୳հഗAᇱᇑ୳հഗBࢅ୳հഗCᇱڦԲড 1. ୳հഗAଙൣڇ ֖Պࡽ! C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 L1 L2 L3 ኵ! 5.6 pF 5.6 pF 12 pF 12 pF 12 pF 6.8 pF 15 pF 15 pF 2.2 pF 10 pF 10 pF 39 nH 56 nH 68 nH ࠃᆌฆׂ႙ࡽ GRM1555C1H5R6DZ01 GRM1555C1H5R6DZ01 GRM1555C1H120JZ01 GRM1555C1H120JZ01 GRM1555C1H120JZ01 GRM1555C1H6R8DZ01 GRM1555C1H150JZ01 GRM1555C1H150JZ01 GRM1555C1H2R2CZ01 GRM1555C1H100JZ01 GRM1555C1H100JZ01 LQG15HS39NJ02D LQG15HS56NJ02D LQG15HS68NJ02D ኵ! 12 pF 12 pF 27 pF 6.8 pF 33 pF 2.2 pF 22 pF 39 nH 56 nH 68 nH ࠃᆌฆׂ႙ࡽ GRM1555C1H120JZ01 GRM1555C1H120JZ01 GRM1555C1H270JZ01 GRM1555C1H6R8DZ01 GRM1555C1H330JZ01 GRM1555C1H2R2CZ01 GRM1555C1H220JZ01 LQG15HS39NJ02D LQG15HS56NJ02D LQG15HS68NJ02D 2. ୳հഗBࢅ୳հഗCଙൣڇ ֖Պࡽ! C1 C2 C3 C4 C5 C6 C7 L1 L2 L3 Rev. 0 | Page 7 of 8 AN-837 PCB୳հഗքਆ୯ ஃ ᅜူଚକ๑ዘࠓ୳հഗइڥፌॅႠీํڦᆩքਆर േă DDSᅃዖຕ֑ᄣဣཥLjഄׂิڦೕሞ֑ᄣೕ୲ڦԠ ೕৎಇଚጣ߲ܠएհă t ሞഗॲူ௬๑ᆩํ႐)փक़*থ֫ںઠইۉگୟ࣍ڦ ୟߌۉLjܸٗইୁۉ࣮ݓگୟ০ڦፆੇă t ୳հഗAዐLjॽᅃ߲Shuntۉඹᆩଇ߲ၭۉඹઠํ၄)֖ ९7)ઠ༵ߛۉඹڦጲၿናೕ୲ժইߌگႠথںăُ ྔLjܔಖୟഗॲࢇ๑ᆩڹևথۥࢅ֫ںևথ֫ںă ኄᄣፔᅜᅃօইߌگႠথںă๑ᆩࡗ߲ܠॽଇ ߲থ֫ںሞᅃഐă ኄၵၟೕ୲܈ޗڦዜႠ۶ڦۯዷᄲઠᇸă୳հഗ ࢅ܋থഗڦాټඪࢆሗොࣷۼইگႠీLjইگ ܈ޗᇑሗොׯ܈ޗኟԲăᅺُLjۨDACዘࠓ୳հഗኮ മLjᆌ֪ଉ୳հഗႠీLjᅜඓԍഄፁਏ༹ᆌᆩᄲ൱ă ൩ऻዿLjᆶၵ୳հഗยऺॲײႾփኧेഗॲࢅքਆ ֖ຕLjኄၵײႾኻఇెၙ୳ڦհഗೕ୲ၚᆌăํाೕ୲ ၚᆌॽߵഗॲࢅᆇຘۉୟӱํڦाߛೕ༬ႠܸՎࣅă t Ն௨୳հഗᇮॲኮक़੍ڥৎă୳հഗC)֖९7* ഗॲքਆڦଆࡻݔ૩ăഗॲքਆ้Ljጽ၍स ิࢅࢻ᳘ࣷᆖၚ୳հഗڦೕ୲ၚᆌă t ᆩഗॲڦጲၿናೕ୲ࢅQᅺຕሁߛሁࡻă t ԍጽ၍ڦፆੇᇑ୳հഗڦ༬Ⴀፆੇ၎ದăኄ ᅃܔۅഗॲࢻժݥ࠲ዘᄲLjܔڍᇀ୳հഗྔ ևۉୟڦጽ၍)૩සLjࢅথ*ܸჾඐዘ ᄲă ©2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. AN05956-0-12/06(0) Rev. 0 | Page 8 of 8