LINEAR TECHNOLOGY LTC2607 Demonstration Circuit16-BIT Dual Rail-to-Rail DAC yokhala ndi I2C Interface User Guide

Chiwonetsero cha dera 934 chimakhala ndi LTC2607 yapawiri 16-bit DAC. Chipangizochi chimakhazikitsa benchmark yatsopano ya boarddensity ya ma 16-bit DACs ndikupititsa patsogolo miyezo ya magwiridwe antchito agalimoto yotulutsa, kuwongolera katundu, ndi crosstalk pagawo limodzi, vol.tagma e-output DACs. DC934 ili ndi zinthu zambiri zowunika momwe LTC2607 ikuyendera. Onboard 5 volt, 4.096 volt, ndi 2.5 volt zolondola zaperekedwa, ndipo LTC2607 ikhoza kuyendetsedwa ndi 5 volt reference pakuwunika momwe njanji ikuyendera. Chinthu chinanso cha bolodi ili ndi LTC2422 0-bit ADC yowunikira mphamvu ya DAC.tage. Cholakwika chonse cha 16ppm cha chipangizochi ndichokwanira kuyesa miyeso yofunikira ya magawo osiyanasiyana a LTC2607.
Kupanga files za board board izi zilipo. Imbani fakitale ya LTC. LTC ndi chizindikiro cha Linear Technology Corporation.

Chithunzi 1. Kukonzekera koyenera kwa Zida Zoyezera

PARAMETER	CONDITION	VALUE
Kusamvana		16 TIDZAKHALA
Monotonicity	Vcc = 5V, Vref = 4.096V	16 TIDZAKHALA
Kusiyanasiyana kwa Nonlinearity	Vcc = 5V, Vref = 4.096V	+/-1 LSB
Integral Nonlinearity	Vcc = 5V, Vref = 4.096V	+/-19 LSB Chofanana
Katundu Regulation	Vcc = Vref = 5V, Midscale Iout = +/- 15 mA	2 LSB/mA Max
DC Crosstalk	Chifukwa chotsitsa zosintha panjira ina iliyonse	3 µV/mA

DZIWANI IZI

Lumikizani DC934 ku DC590 USB serial controller pogwiritsa ntchito chingwe cha riboni cha 14-conductor. Lumikizani DC590 ku PC yolandila ndi chingwe cha USB A/B. Yambitsani pulogalamu yowunikira yomwe yaperekedwa
DC590 kapena tsitsani pa www.linear.com. Gulu lolondola lowongolera liziikidwa zokha.
Dinani batani la COLLECT kuti muyambe kutulutsa ma code ku DAC ndikuwerenganso zomwe zatulukatage.
Zolemba zonse za mapulogalamu zilipo kuchokera pa menyu Thandizo, chifukwa zina zikhoza kuwonjezeredwa nthawi ndi nthawi.

KUKHALA KWA ZINTHU ZOFUNIKA

LUMPERS

JP1 - Vref Select. Sankhani 5 volt, 4.096 volt, kapena 2.5 volt reference. Kuti mugwiritse ntchito mawonekedwe akunja kudzera mu Vref Turret, chotsani chodumpha ichi.
JP2 - Vcc sankhani. Vcc imatengedwa kuchokera ku 5 volt reference kapena 5 volt yoyendetsedwa ndi board board. Kusankha 5 volt refer-ence ya VCC ndi Vref kumapangitsa kuti njanji igwire ntchito ya njanji ya LTC2607.
JP3 - ADC Letsani. Yatsani kuti igwire ntchito ndi DC590 serial controller. Mukamagwiritsa ntchito pomaliza kasitomala, ADC ikhoza kuyimitsidwa pokhazikitsa jumper kuti ZIMIMITSA.
Pamiyezo yaphokoso yovuta kwambiri mukamagwiritsa ntchito pulogalamu yoperekedwa ndi LTC, ikani mphamvu yotulutsatage ndi kusiya kuwerenga voltage kudzera pa batani lotolera pagawo lowongolera.
JP5 - Kulumikizana kwa REFLO - kukhazikitsidwa kapena kuperekedwa kunja. Onani LTC2607 Zambiri za REFLO.
JP4,6,7 - I2C kusankha adilesi. Izi ndizolumikizidwa ndi CA0, CA1, CA2 pini. Pulogalamu ya demo imagwiritsa ntchito adilesi yapadziko lonse ya I2C, kotero mapiniwa alibe mphamvu akagwiritsidwa ntchito ndi pulogalamu ya QuickEval. Iwo akhoza kugwiritsidwa ntchito mu prototyping kukhazikitsa

Adilesi ya I2C ya LTC2607 - tchulani zidziwitso zamamapu a milingo ya CA0,1,2 ku ma adilesi a I2C.

ZOKHUDZA ANALOG

VOUTA, VOUTB - LTC2607 Zotuluka

Vref - Vref turret imalumikizidwa mwachindunji ndi malo owonetsera a LTC2607 ndi LTC2422 ADC. Pamene chimodzi mwazolemba zapamtunda chikugwiritsidwa ntchito, reference voltagndikhoza kuyang'aniridwa panthawiyi. Kufotokozera kwakunja kungagwiritsidwenso ntchito pa turret iyi mutachotsa JP1.

KUGWIRITSA NTCHITO NDI MPHAMVU

Mphamvu (Vcc) - Nthawi zambiri DC934 imayendetsedwa ndi woyang'anira DC590. Vcc ikhoza kuperekedwa ku turret iyi, komabe magetsi a DC590 ayenera kuzimitsidwa! Onani DC590 Quick Start Guide kuti mumve zambiri pamachitidwe awa. Kuyika pansi - Mphamvu zosiyana ndi zizindikiro zimaperekedwa. Mafunde akulu aliwonse otengedwa kuchokera ku zotulutsa za DAC ayenera kubwezeredwa pamalo opangira magetsi. Komanso, ngati magetsi akunja alumikizidwa, magetsi ayenera kugwiritsidwa ntchito. Malo opangira ma Signal amalumikizidwa ndi ndege zapansi zowonekera pamwamba ndi pansi pa bolodi, ndi ma turrets awiri olembedwa "Gnd." Gwiritsani ntchito ma sign sign ngati polozera miyeso ndi kulumikizana ndi mabwalo akunja.

ZOCHITIKA

Zoyeserera zotsatirazi ndizomwe zikuwonetsa zina mwazabwino za LTC2607. Zonse zitha kuchitidwa pogwiritsa ntchito onboard LTC2422 kuyang'anira kuchuluka kwa DACtage. Voltage angagwirizane ndi voltmeter ya HP3458A mpaka manambala 5. Ngati DAC ikhala ikumira kapena kupezerapo mphamvu yamagetsi, ndiye kuti voltage iyenera kuyezedwa pafupi ndi DAC momwe kungathekere.
Zambiri zamapepala a data zimagwiritsa ntchito 4.096 volt reference, kotero iyi ndiye katchulidwe komwe kamakonda kugwiritsidwa ntchito pazoyesererazi. Kugwiritsa ntchito 5 volt regulator monga gwero la Vcc kuli ndi malire kuti Vcc ikhoza kukhala yotsika pang'ono kuposa Vref, zomwe zingakhudze cholakwika chonse. Kusankha 5 volt reference ngati gwero la Vcc kumapambana izi, komabe zonse zomwe LTC2601 ingatulukire zitha kukhala pafupifupi 5mA.
ZINDIKIRANI: Kugwiritsa ntchito magetsi akunja kumalimbikitsidwa kwambiri pazoyeserera izi, makamaka zomwe zimakopa mphamvu zamakono. Onani chiwongolero choyambira mwachangu cha DC590 kuti mumve zambiri.

KUSINTHA

LTC2422 ADC yomwe ili m'bwalo ili ndi mawonekedwe a 6mV. Izi zidzathetsa mosavuta 1 LSB (76mV ya Vref=5V, 62.5mV ya Vref=4.096V) kusintha kwa LTC2607. Khazikitsani zotulutsa za DAC kukhala voltagndi pafupi ndi Midscale. Sankhani FINE slider pagawo lowongolera ndi mbewa ndipo gwiritsani ntchito mivi yakumanja ndi yakumanzere kuti muwongolere zomwe zatuluka ndi ma LSB amodzi. Kusintha kuyenera kuwonekera bwino mu graph yotuluka. (Zingakhale zofunikira kuyembekezera kuti graph imveke ngati sitepe yaikulu yangochitika kumene.)

KUSAVUTA KWAMBIRI

Muyeso wovuta wa INL ukhoza kutengedwa pogwiritsa ntchito ADC yomwe ili m'bwalo. Yezerani chimodzi mwazotulutsa za LTC2607 pa code 256 ndi 65,535 ndikuwerengera malo otsetsereka ndikudula pogwiritsa ntchito spreadsheet. Kenako, werengani kangapo pa mfundo zapakatikati. Zowerengera siziyenera kuchoka pamzere wowerengeka ndi ma LSB opitilira 64, ndipo nthawi zambiri azikhala mkati mwa 12 LSB.

KULEMEKEZA ZOKHUDZA / DC OUTPUT IMPEDANCE

Sankhani "5V REG" kwa Vcc gwero. Khazikitsani chimodzi mwazotuluka ku Midscale (code 32768). Gwero kapena kumira 15 mA kuchokera ku chimodzi mwazotulutsa za DAC pochikokera pamagetsi kapena Vcc yokhala ndi zopinga zoyenera. VoltagKusintha kwa e kuyenera kukhala kosakwana 2.25mV, kutengera kulephera kwa 0.15L. Zotulutsa zotulutsa nthawi zambiri zimakhala zosakwana 0.030L. (yezerani DAC voltage pa pini yotulutsa ngati mukugwiritsa ntchito voltmeter.)

ZERO SCALE ERROR

Ikani imodzi mwa ma DAC kukhala khodi 0. Kutulutsa koyezedwa kuyenera kukhala kosakwana 9mV ndipo nthawi zambiri kumakhala kosakwana 1mV.

ZOPHUNZITSA ZONSE

Ikani imodzi mwa ma DAC kukhala khodi 256. The output voltage iyenera kukhala mkati mwa 9mV ya mtengo wolondola, kapena Vref x 256/65535.

PEZA ZOLAKWA

Ikani imodzi mwa ma DAC kuti ikhale 65,535. Mphamvu yotulutsa mphamvu iyenera kukhala mkati mwa 0.7% ya Vref, ndipo nthawi zambiri imakhala mkati mwa 0.2%.

Chithunzi cha DC CROSSTALK

Khazikitsani imodzi mwa ma DAC kukhala Midscale. Lumikizani chopinga cha 250 ohm kuchokera pazotulutsa kupita ku Vcc kapena Power Ground (kumira kapena gwero la 10mA, motsatana, pamene 5V ikugwiritsidwa ntchito.) Kutulutsa kwina kuyenera kusasintha kupitirira 3.5mV pa milli.amp ya katundu panopa.

Werengani Zambiri Za Bukuli & Tsitsani PDF:

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LINEAR TECHNOLOGY LTC2607 Demonstration Circuit16-BIT Dual Rail-to-Rail DAC yokhala ndi I2C Interface [pdf] Buku Logwiritsa Ntchito
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