LINEAR TECHNOLOGY LTC2607 Demonstration Circuit16-BIT Dual Rail-To-Rail DAC ene-I2C Interface User Guide
DESCRIPTION
Isekethe ye-Demonstration 934 ifaka i-LTC2607 dual 16-bit DAC. Le divayisi isungula ibhentshimakhi entsha ye-boarddensity ye-16-bit DACs futhi ithuthukise amazinga okusebenza edrayivu ephumayo, ukulawula ukulayisha, kanye ne-crosstalk ekunikezeni okukodwa, ivolumutagama-DAC e-e-output. I-DC934 inezici eziningi zokuhlola ukusebenza kwe-LTC2607. I-Onboard 5 volt, 4.096 volt, kanye nezithenjwa ezinemba ze-volt ezingu-2.5 zinikeziwe, futhi i-LTC2607 ingase inikwe amandla ireferensi engu-5 volt yokuhlola ukusebenza kukaloliwe ukuya kusitimela. Esinye isici saleli bhodi yi-onboard LTC2422 0-bit ADC yokuqapha ivolumu yokuphuma kwe-DAC.tage. Iphutha eliphelele le-16ppm lale divayisi lanele ukuthatha izilinganiso ezinengqondo zamapharamitha ahlukahlukene we-LTC2607.
Idizayini files zaleli bhodi lesifunda ziyatholakala. Shayela imboni ye-LTC. I-LTC wuphawu lokuhweba lwe-Linear Technology Corporation.
Umfanekiso 1. Ukusetha Okufanelekile Kwezisetshenziswa Zokulinganisa
| I-PARAMETER | ISIMO | VALUE |
| Isixazululo | IZINCANE EZINGU-16 | |
| I-Monotonicity | Vcc = 5V, Vref = 4.096V | IZINCANE EZINGU-16 |
| I-Differential Nonlinearity | Vcc = 5V, Vref = 4.096V | +/-1 LSB |
| I-Integral Nonlinearity | Vcc = 5V, Vref = 4.096V | +/-19 LSB Okuvamile |
| Umthethonqubo Womthwalo | Vcc = Vref = 5V, Midscale
Iout = +/- 15 mA |
2 LSB/mA Max |
| DC Crosstalk | Ngenxa yokulayisha ushintsho lwamanje kunoma yisiphi esinye isiteshi | 3 µV/mA |
INQUBO YOKUQALA NGOKUSHESHA
Xhuma i-DC934 kusilawuli se-serial se-USB ye-DC590 usebenzisa intambo yeribhoni ye-14-conductor enikeziwe. Xhuma i-DC590 ku-PC yomsingathi ngentambo evamile ye-USB A/B. Qalisa isofthiwe yokuhlola ehlinzekwe ngayo
I-DC590 noma uyilande ku-www.linear.com. Iphaneli yokulawula efanele izolayishwa ngokuzenzakalelayo.
Chofoza inkinobho ethi QOQA ukuze uqale ukukhipha amakhodi ku-DAC futhi ufunde ukubuyisela umthamo ophumayotage.
Imibhalo yesofthiwe ephelele iyatholakala entweni yemenyu yosizo, njengoba izici zingase zengezwe ngezikhathi ezithile.
UKUSETSHENZISWA KWE-HARDWARE
AMA-JUMPERS
JP1 - I-Vref Khetha. Khetha i-5 volt, 4.096 volt, noma ireferensi engu-2.5 volt. Ukuze usebenzise ireferensi yangaphandle nge-Vref Turret, susa lesi siqhumane.
JP2 – Vcc khetha. I-Vcc ithathwa kunkomba ye-volt engu-5 noma i-5 volt elawulwayo ephuma ebhodini lokulawula. Ukukhetha ireferensi engu-5 volt ye-VCC ne-Vref kuvumela ukucaciswa komzila wesitimela ukuze usebenze wesitimela we-LTC2607.
JP3 - ADC Khubaza. Misa ukuthi iVULIWE ukuze isebenze ngesilawuli se-serial se-DC590. Uma usebenzisa esicelweni sokugcina sekhasimende, i-ADC ingakhutshazwa ngokuphelele ngokusetha i-jumper ukuthi KHUBAZA.
Ngezilinganiso zomsindo ezibucayi kakhulu uma usebenzisa isofthiwe ehlinzekwe yi-LTC, setha ivolumu yokuphumayotage futhi ayeke ukufunda voltage ngenkinobho yokuqoqa kuphaneli yokulawula.
I-JP5 - uxhumano lwe-REFLO - lusekelwe phansi noma luhlinzekwe ngaphandle. Bheka idatha ye-LTC2607 yemininingwane ye-REFLO.
JP4,6,7 – I2C ukukhethwa kwekheli. Lezi zixhunywe kumaphinikhodi we-CA0, CA1, CA2. Isoftiwe yedemo isebenzisa ikheli le-I2C lomhlaba wonke, ngakho lawa maphini awanawo umthelela uma esetshenziswa neSoftware ye-QuickEval. Zingasetshenziswa ku-prototyping ukusetha
Ikheli le-I2C le-LTC2607 – bhekisa kumininingwane yedatha yokumetshwa kwamazinga e-CA0,1,2 kumakheli e-I2C.
IZIXHUMANO ZE-ANALOG
I-VOTA, VOUTB – LTC2607 Imiphumela
I-Vref – I-Vref turret ixhumeke ngqo kumatheminali okubhekisela e-LTC2607 kanye ne-LTC2422 ADC. Uma kusetshenziswa ireferensi eyodwa ebhodini, ireferensi voltagengase igadwe ngalesi sikhathi. Isithenjwa sangaphandle singase futhi sisetshenziswe kule turret ngemva kokukhipha i-JP1.
UKUGQWA KANYE NEZIXHUMANO ZAMANDLA
Amandla (Vcc) - Ngokujwayelekile i-DC934 inikwa amandla isilawuli se-DC590. I-Vcc ingahlinzekwa kule turret, kodwa amandla kagesi aku-DC590 kufanele acishwe! Bheka ku-DC590 Quick Start Guide ukuze uthole imininingwane eyengeziwe ngale ndlela yokusebenza. Grounding - Amandla ahlukene kanye nezizathu zesignali zinikeziwe. Noma imaphi amaza amakhulu adonswa kokuphumayo kwe-DAC kufanele abuyiselwe endaweni kagesi. Futhi, uma ukunikezwa kwamandla kwangaphandle kuxhunyiwe, indawo kagesi kufanele isetshenziswe. Indawo eyisignali ixhunywe ezindizeni zaphansi eziveziwe ezisemaphethelweni aphezulu naphansi ebhodi, kanye nasezintanjeni ezimbili ezibhalwe ukuthi “Gnd.” Sebenzisa indawo yesignali njengendawo eyinkomba yezilinganiso noxhumo kumasekhethi angaphandle.
ucwaningo
Lokhu kuhlola okulandelayo kuhloselwe ukukhombisa ezinye zezici ezivelele ze-LTC2607. Konke kungenziwa kusetshenziswa i-onboard LTC2422 ukuqapha ivolumu yokuphuma kwe-DACtage. Umthamo wokukhipha okhonjisiwetage ngokuvamile uzovumelana ne-HP3458A voltmeter kuya kumadijithi angu-5. Uma i-DAC izocwila noma ithole amandla akhona abalulekile, khona-ke umthamo ophumayotage kufanele ikalwe eduze ne-DAC ngangokunokwenzeka.
Izicaciso eziningi zeshidi ledatha zisebenzisa ireferensi engu-4.096 volt, ngakho-ke lesi isithenjwa esincanyelwayo esingasetshenziselwa lokhu kuhlolwa. Ukusebenzisa isilawuli esingu-5 volt njengomthombo we-Vcc kunomkhawulo wokuthi i-Vcc ingase ibe ngaphansi kancane kune-Vref, okungase kuthinte iphutha lesikali esigcwele. Ukukhetha inkomba engu-5 volt njengomthombo we-Vcc kunqoba lokhu, nokho isamba samanje esingatholwa yi-LTC2601 sizokhawulelwa cishe ku-5mA.
QAPHELA: Ukusebenzisa amandla angaphandle kuyanconywa kakhulu kulezi zivivinyo, ikakhulukazi lezo ezidonsa amandla akhona. Bheka umhlahlandlela wokuqala osheshayo we-DC590 ukuze uthole imininingwane.
ISIXAZULULO
I-LTC2422 ADC ebhodini inokulungiswa kokufaka kwe-6mV. Lokhu kuzoxazulula kalula inguquko engu-1 LSB (76mV ye-Vref=5V, 62.5mV ye-Vref=4.096V) ekukhishweni kwe-LTC2607. Setha okukhiphayo kwe-DAC kube yivolumutage eduze Midscale. Khetha isilayidi ESIHLE kuphaneli yokulawula ngegundane bese usebenzisa izinkinobho zomcibisholo wesokudla nesokunxele ukuze unyathele okukhiphayo ngama-LSB awodwa. Ushintsho kufanele lubonakale ngokucacile kugrafu yokuphumayo. (Kungase kudingeke ukuba ulinde igrafu ukuthi icace uma isinyathelo esikhulu sisanda kwenzeka.)
UKUNGENAMTHETHO OKUYIMPHAKATHI
Isilinganiso esinzima se-INL singathathwa kusetshenziswa i-ADC esebhodini. Linganisa okukodwa kokuphumayo kwe-LTC2607 kukhodi 256 naku-65,535 futhi ubale ukuthambeka bese unqamula usebenzisa isipredishithi. Okulandelayo, thatha ukufundwa okuningana ezindaweni eziphakathi nendawo. Ukufundwa akufanele kuphambuke emugqeni obaliwe ngama-LSB angaphezu kuka-64, futhi ngokuvamile kuzoba phakathi kwama-LSB angu-12.
UMTHETHO WOKULAWULWA / IMPEDANCE YOKUPHUMA KWE-DC
Khetha okuthi “5V REG” ukuze uthole umthombo we-Vcc. Setha okunye kokuphumayo ku-Midscale (ikhodi 32768). Umthombo noma usike u-15 mA kokunye kokuphumayo kwe-DAC ngokuyidonsela endaweni yamandla noma i-Vcc enenani eliphikisayo elifanele. Umqulutaginguquko kufanele ibe ngaphansi kuka-2.25mV, ihambisane nokuphazamiseka kokukhiphayo okungu-0.15L. Ukuphazamiseka kokuphumayo ngokuvamile kungaphansi kuka-0.030L. (linganisa i-DAC voltage ephinikhodi yokukhiphayo uma usebenzisa i-voltmeter.)
IPHUTHA LESIKALI ESIZIRO
Setha eyodwa yama-DAC kukhodi 0. Okukhiphayo okukaliwe kufanele kube ngaphansi kuka-9mV futhi ngokuvamile kuzoba ngaphansi kuka-1mV.
IPHUTHA LE-OFFSET
Setha eyodwa yama-DAC kukhodi 256. Umthamo wokukhiphayotage kufanele ibe phakathi kuka-9mV yenani elilungile, noma i-Vref x 256/65535.
ZUZA IPHUTHA
Setha eyodwa yama-DAC kukhodi 65,535. I-voltage ephumayo kufanele ibe phakathi kuka-0.7% we-Vref, futhi ngokuvamile izoba phakathi kuka-0.2%.
I-DC CROSSTALK
Misa enye ye-DAC ibe Isikali Esimaphakathi. Xhuma i-resistor engu-250 ohm ukusuka kokuphumayo uye ku-Vcc noma ku-Power Ground (ukucwilisa noma ukhiphe i-10mA, ngokulandelana, lapho kusetshenziswa ireferensi ye-5V.) Okunye okukhiphayo akufanele kushintshe ngaphezu kuka-3.5mV ngemililitha ngayinye.amp yomthwalo wamanje.
Funda okwengeziwe ngale Manuwali & Landa i-PDF:
Amadokhumenti / Izinsiza
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