LINEAR TECHNOLOGY LTC2607 Ua qauv qhia Circuit Court16-BIT Dual Rail-Rail-Rail DAC nrog I2C Interface Tus Neeg Siv Qhia
Kev piav qhia
Ua qauv qhia Circuit Court 934 nta LTC2607 dual 16-ntsis DAC. Cov cuab yeej no tsim kom muaj kev sib tw tshiab ntawm boarddensity benchmark rau 16-ntsis DACs thiab txhim kho cov qauv kev ua tau zoo rau kev tso zis tsav, kev tswj kev thauj khoom, thiab kev sib txuas lus hauv ib qho khoom, vol.tage-tso zis DACs. DC934 muaj ntau yam nta rau kev ntsuas qhov ua tau zoo ntawm LTC2607. Onboard 5 volt, 4.096 volt, thiab 2.5 volt precision references yog muab, thiab LTC2607 tej zaum yuav powered los ntawm 5 volt siv rau kev soj ntsuam rail-rau-rail kev khiav hauj lwm. Lwm qhov tshwj xeeb ntawm lub rooj tsavxwm no yog onboard LTC2422 0-ntsis ADC rau kev saib xyuas DAC tso zis voltage. Qhov 16ppm tag nrho qhov yuam kev ntawm cov cuab yeej no tsim nyog rau kev ntsuas cov ntsiab lus ntawm ntau yam LTC2607 tsis.
Tsim files rau lub rooj tsav xwm Circuit Court no muaj. Hu rau LTC Hoobkas. LTC yog lub cim lag luam ntawm Linear Technology Corporation.
Daim duab 1. Kev ntsuas cov cuab yeej tsim nyog
| PARAMETER | TXOJ CAI | VALUE |
| Kev daws teeb meem | 16 TSI | |
| Monotonicity | Vcc = 5V, Vref = 4.096V | 16 TSI |
| Plawg tsis tseeb | Vcc = 5V, Vref = 4.096V | +/- 1 LSB |
| Txoj Kev Ib Leeg Tsis Txaus | Vcc = 5V, Vref = 4.096V | +/-19 LSB Typical |
| Load Regulation | Vcc = Vref = 5V, Midscale
Cov zis = +/- 15 mA |
2 LSB/mA Max |
| DC Crosstalk | Vim load tam sim no hloov ntawm lwm yam channel | 3 µV/mA |
QHOV TSEEM CEEB TSHAJ PLAWS
Txuas DC934 mus rau DC590 USB serial maub los siv 14-conductor ribbon cable. Txuas DC590 rau lub PC host nrog tus qauv USB A / B cable. Khiav qhov kev ntsuam xyuas software muab nrog
DC590 lossis rub tawm ntawm www.linear.com. Lub vaj huam sib luag tswj kom raug yuav raug thauj khoom cia.
Nias lub pob COLLECT pib tawm cov lej rau DAC thiab nyeem rov qab cov txiaj ntsig tso tawm voltage.
Ua kom tiav cov ntaub ntawv software muaj nyob ntawm Pab Pawg Menyuam, vim cov yam ntxwv yuav raug ntxiv ib ntus.
HARDWARE SAIB-UP
JUMPERS
JP1 – Vref Xaiv. Xaiv 5 volt, 4.096 volt, lossis 2.5 volt siv. Txhawm rau siv qhov kev siv sab nraud los ntawm Vref Turret, tshem tawm cov jumper no.
JP2 – Vcc xaiv. Vcc yog muab los ntawm on-board 5 volt siv los yog 5 volt tswj cov khoom los ntawm pawg tswj hwm. Xaiv 5 volt xa mus rau VCC thiab Vref tso cai rau tus yam ntxwv ntawm kev tsheb ciav hlau mus rau kev tsheb ciav hlau ntawm LTC2607.
JP3 – ADC Disable. Teem rau ON rau kev ua haujlwm nrog DC590 serial maub los. Thaum siv nyob rau hauv cov neeg siv khoom kawg daim ntawv thov, ADC tuaj yeem cuam tshuam tag nrho los ntawm kev teeb tsa jumper rau DISABLE.
Rau kev ntsuas suab nrov heev thaum siv LTC muab software, teeb tsa cov zis voltage thiab nres nyeem ntawv voltage ntawm lub khawm sau ntawm lub vaj huam sib luag tswj.
JP5 - REFLO kev twb kev txuas - txawm nyob hauv av lossis sab nraud muab. Xa mus rau LTC2607 datasheet rau REFLO cov ntsiab lus.
JP4,6,7 – I2C chaw nyob xaiv. Cov no yog txuas nrog CA0, CA1, CA2 pins. Lub demo software siv lub ntiaj teb no I2C chaw nyob, yog li cov pins no tsis muaj txiaj ntsig thaum siv nrog QuickEval software. Lawv tuaj yeem siv rau hauv prototyping los teeb tsa
I2C chaw nyob ntawm LTC2607 - xa mus rau daim ntawv teev cov ntaub ntawv qhia txog CA0,1,2 qib rau I2C chaw nyob.
Kev sib txuas ntawm ANALOG
VOUTA, VOUTB – LTC2607 Outputs
Vref - Lub Vref turret txuas ncaj qha mus rau cov khoom siv ntawm LTC2607 thiab LTC2422 ADC. Thaum ib qho ntawm cov ntaub ntawv sau npe raug siv, cov ntaub ntawv siv voltage tej zaum yuav raug saib xyuas ntawm qhov no. Ib qho kev siv sab nraud kuj tseem tuaj yeem siv rau lub turret no tom qab tshem tawm JP1.
KEV PAB CUAM THIAB LUB CHAW UA HAUJ LWM
Fais fab (Vcc) - Feem ntau DC934 yog siv los ntawm DC590 maub los. Vcc tuaj yeem muab tau rau lub turret no, txawm li cas los xij, lub hwj chim ntawm DC590 yuav tsum tsis ua haujlwm! Xa mus rau DC590 Quick Start Guide kom paub meej ntxiv txog hom kev ua haujlwm no. Grounding - cais lub zog thiab teeb liab hauv av. Txhua qhov hluav taws xob loj uas tau txais los ntawm DAC cov zis yuav tsum rov qab mus rau hauv av. Tsis tas li ntawd, yog tias qhov hluav taws xob sab nraud txuas nrog, lub zog hauv av yuav tsum tau siv. Cov teeb liab hauv av txuas nrog cov dav hlau hauv av sab saum toj thiab hauv qab ntawm lub rooj tsavxwm, thiab rau ob lub turrets sau tias "Gnd." Siv cov teeb liab hauv av ua qhov taw qhia rau kev ntsuas thiab kev sib txuas rau cov kab hluav taws xob sab nraud.
KAWM
Cov kev sim hauv qab no yog npaj los ua kom pom qee qhov zoo tshaj plaws ntawm LTC2607. Txhua yam tuaj yeem ua tau siv lub onboard LTC2422 los saib xyuas DAC cov zis voltage. Indicated tso zis voltage feem ntau yuav pom zoo nrog HP3458A voltmeter rau 5 tus lej. Yog hais tias ib tug DAC yuav tog los yog muab qhov tseem ceeb tam sim no, ces cov zis voltage yuav tsum ntsuas kom ze rau DAC li sai tau.
Feem ntau ntawm cov ntaub ntawv qhia tshwj xeeb siv 4.096 volt siv, yog li qhov no yog qhov nyiam siv los siv rau cov kev sim no. Siv 5 volt regulator raws li lub hauv paus rau Vcc muaj qhov kev txwv tias Vcc yuav qis dua Vref me ntsis, uas yuav cuam tshuam rau tag nrho qhov yuam kev. Xaiv 5 volt siv raws li qhov chaw rau Vcc kov yeej qhov no, txawm li cas los xij tag nrho tam sim no uas LTC2601 tuaj yeem siv tau yuav raug txwv rau kwv yees li 5mA.
CEEB TOOM: Kev siv cov khoom siv hluav taws xob sab nraud yog qhov pom zoo rau cov kev sim no, tshwj xeeb tshaj yog cov uas kos qhov tseem ceeb tam sim no. Xa mus rau DC590 phau ntawv qhia pib ceev kom paub meej.
RESOLUTION
Lub onboard LTC2422 ADC muaj kev daws teeb meem ntawm 6mV. Qhov no yuav daws tau yooj yim 1 LSB (76mV rau Vref = 5V, 62.5mV rau Vref = 4.096V) hloov pauv hauv cov zis LTC2607. Teem lub DAC tso zis rau ib voltage ze rau Midscale. Xaiv tus FINE slider ntawm lub vaj huam sib luag tswj nrog tus nas thiab siv tus yuam sij sab xis thiab sab laug txhawm rau ua kom cov zis tawm los ntawm ib qho LSBs. Qhov kev hloov pauv yuav tsum pom meej meej hauv daim duab tso zis. (Tej zaum yuav tsum tau tos daim duab kom meej yog tias ib kauj ruam loj tau tshwm sim.)
INTEGRAL NONLINEARITY
Kev ntsuas ntxhib ntawm INL tuaj yeem siv los ntawm onboard ADC. Ntsuas ib qho ntawm LTC2607 tso tawm ntawm tus lej 256 thiab 65,535 thiab suav cov nqes hav thiab cuam tshuam siv daim ntawv nthuav dav. Tom ntej no, coj ob peb nyeem ntawm cov ntsiab lus nruab nrab. Kev nyeem ntawv yuav tsum tsis txhob sib txawv ntawm cov kab laij lej los ntawm ntau dua 64 LSBs, thiab lawv feem ntau yuav nyob hauv 12 LSBs.
TXOJ CAI / DC OUTPUT IMPEDANCE
Xaiv "5V REG" rau Vcc qhov chaw. Teem ib qho ntawm qhov tawm mus rau Midscale (code 32768). Qhov chaw lossis dab dej 15 mA los ntawm ib qho ntawm DAC outputs los ntawm rub nws mus rau hauv av lossis Vcc nrog tus nqi tsim nyog. Lub voltage hloov yuav tsum tsawg dua 2.25mV, sib haum mus rau qhov tso zis impedance ntawm 0.15L. Cov zis impedance feem ntau tsawg dua 0.030L. ( ntsuas DAC voltage ntawm tus pin tso zis yog siv lub voltmeter.)
ZERO SCALE ERROR
Teem ib qho ntawm DAC rau code 0. Cov zis ntsuas yuav tsum tsawg dua 9mV thiab feem ntau yuav tsawg dua 1mV.
OFFSET yuam kev
Teem ib lub DAC rau code 256. Cov zis voltage yuav tsum tsis pub dhau 9mV ntawm tus nqi raug, lossis Vref x 256/65535.
TAU TXAIS NYIAJ
Teem ib qho ntawm DAC rau code 65,535. Cov zis voltage yuav tsum nyob rau hauv 0.7% ntawm Vref, thiab feem ntau yuav nyob rau hauv 0.2%.
DC CROSSTALK
Teem ib qho ntawm DACs rau Midscale. Txuas lub 250 ohm resistor los ntawm cov zis mus rau Vcc lossis Lub Hwj Huam Hauv av (kom lub dab dej lossis qhov chaw 10mA, raws li, thaum siv 5V siv.) Lwm qhov tso zis yuav tsum tsis txhob hloov ntau dua 3.5mV ib milliamp ntawm load tam sim no.
Nyeem ntxiv Txog Phau Ntawv Qhia no & Download PDF:
Cov ntaub ntawv / Cov ntaub ntawv
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