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AN-1069
ᆌᆩԴ
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
AD7190ĂAD7192ĂAD7193ĂAD7194ࢅAD7195ڦଭჽఇ๕
ፕኁǖMary McCarthy ࢅ Adrian Sherry
Rev. 0 | Page 1 of 4
1. ຕ୲၎ᆌ૬้๖૩(Sinc
4
୳հഗ)
FS[9:0] ຕ୲(Hz) ૬้(ms)
480 2.5 400
96 12.5 80
80 15 66.6
12 100 10
5 240 4.17
1 1200 0.83
2. ຕ୲၎ᆌ૬้๖૩(Sinc
3
୳հഗ)
FS[9:0] ຕ୲(Hz) ૬้(ms)
480 3.3 300
96 16.7 60
80 20 50
16 100 10
5 320 3.125
CHANNEL
ZERO-LATENCY
CHANNEL B
1/f
ADC
CHANNEL A
CHANNEL A CHANNEL A CHANNEL B
08939-001
1. ཚڢՎ߸(ଭჽఇ๕)
ᅜฉଚڦADCྺాዃPGAڦגگሯำĂ24࿋Σ-Δఇຕገ
࣑ഗăኄၵׂԈઔᅃ߲ຕጴ୳հഗLjገ࣑ഗዷᄲևݴ
ኮᅃă୳հഗᆶܠዖದዃݛ๕Lj֑ᆩഄዐኮᅃ้Lj୳հ
ഗ߾ፕ้փ٪ሞΣ-Δ ADCڦ૬้ჽăԨᆌᆩԴ
ถኄዖఇ๕Ljժᇑཞᄣ٪ሞᇀኄૌADCዐڦدཥڦ୳
հݛ๕ႜԲডă
ଭჽఇ๕
ኄૌADC༵ࠃକᅃዖၜLj୳հഗዃᇀଭჽఇ๕
ڇዜ૬ఇ๕ăሞఇ๕ူLjADCዜ๔ዕڪᇀ୳
հഗ૬้ăᅺُLjஃገ࣑ഗޏᅜڇཚڢႜገ
࣑Lj࣏ཚڢޏዜႠՎࣅLjADCڦຕ୲
๔ዕ၎ཞă
ኻႴMode٪ഗዐڦSINGLE࿋ยྺ1LjADC߾ፕᇀଭ
ჽఇ๕ă
ԨᆌᆩԴዐ༪ஃڦADCᆶଇዖ୳հഗૌ႙ǖsinc
3
୳հഗ
ࢅsinc
4
୳հഗ(ཚࡗMode٪ഗዐڦSINC3࿋ስ)ă
ሞଭჽఇ๕ူLjຕ୲ڪᇀ
f
ADC
= f
CLK
/(3072 × FS[9:0])
ᅜฉኍܔsinc
3
୳հഗ
f
ADC
= f
CLK
/(4096 × FS[9:0])
ᅜฉኍܔsinc
4
୳հഗ
ഄዐǖ
f
CLK
ྺዷ้ዓೕ୲(Քኵ4.92 MHz)ă
FS[9:0]ྺMode٪ഗFS9࿋FS0࿋ዐڦஓڦๆڪၳ
ኵă
ኄቘհ্ᆩ้ຕ୲ڦ໙ࠅ๕ă൩ጀᅪLjأݥ
ଷᆶຫLjԨᆌᆩԴย্ᆩቘհă
ଇዖ൧ူLj૬้ڪᇀ
t
SETTLE
= 1/f
ADC
ᅜฉኍܔsinc
3
sinc
4
୳հഗă
1ࢅ2ଚକᅃၵ๑ᆩsinc
3
ࢅsinc
4
୳հഗ้փཞFSኵܔ
ᆌڦຕ୲ă
ཚڢՎ߸
1๖ྺሞഔᆩଭჽఇ๕้ADCܔཚڢՎ߸ڦၚᆌă
ٗ1ᅜLjཚڢAࢅཚڢBڦገ้࣑၎ཞڦăٗ
ཚڢAൎ࣑ཚڢB้ժ࿄ڞዂჽሺă
܋ฉڦఇెሂՎࣅ
සࡕఇెۉუ݀ิሂՎࣅLjሶADC݆֪ڟՎ
ࣅLjࣷჄᆶገ࣑ăᆶీူᅃْገ࣑փࣷྜඇ
ݒᆙఇెڦՎࣅLjᅺྺሂՎࣅࢫՂႷঢ়ࡗྜኝڦ
૬ࡗײ(2)ăኄዖ൧ူLjྜඇݒᆙఇెՎࣅڦ
ཚڢՎ߸ኮࢫڦڼْܾገ࣑ăᅺُLjଭჽժփీඓԍ
ᆶገ࣑ڥڟྜඇ૬ă
