I-LINEAR TECHNOLOGY LTC2000-16 Umhlahlandlela Wokufaka Isekhethi
LTC2000, LTC2000A
16-, 14-, 11-Bit, 2.5Gsps kuya ku-2.7Gsps DACs
DESCRIPTION
Isekethe ye-Demonstration 2085 isekela i-LTC®2000 ne-LTC2000A, isivinini esiphezulu, umndeni wobubanzi obuguqukayo obuphezulu wama-DAC. Yakhelwe ngokukhethekile izinhlelo zokusebenza ezidinga imiphumela ehlanganisiwe ye-DC ehlukile. I-DC2085 isekela umndeni ophelele we-LTC2000 kufaka phakathi izingxenye eziyi-16, 14 kanye ne-11 bit. Ukuze uthole zonke izinguquko bheka Ithebula 1.
Isekhethi kokuphumayo kwe-analog ithuthukiselwe amaza e-analog ukusuka ku-DC-1.08GHz.
Idizayini files zaleli bhodi lesifunda ziyatholakala ku
http://www.linear.com/demo/DC2085
I-LT, LTC, LTM, Linear Technology kanye nelogo ye-Linear yizimpawu zokuthengisa ezibhalisiwe ze-Analog
I-Devices, Inc. Zonke ezinye izimpawu zokuthengisa ziyimpahla yabanikazi bazo.
Ithebula 1. DC2085 Izinhlobonhlobo
ISIFINYEZO SOKUSEBENZA
Imininingwane iku-TA = 25°C
INQUBO YOKUQALA NGOKUSHESHA
I-DC2085 kulula ukuyimisa ukuze ihlole ukusebenza kwe-LTC2000. Bheka uMdwebo 1 ukuze uthole ukusethwa okufanele kwemishini yokulinganisa bese ulandela inqubo engezansi:
Setha
Uma i-Altera Stratix IV GX FPGA Development Kit ingazange inikezwe isekethe yokubonisa ye-DC2085, landela imanuwali yedemo ye-Altera Stratix IV ukuze ufake isofthiwe edingekayo kanye nokuxhuma i-Altera Stratix IV ku-DC2085 kanye ne-PC.
Umfanekiso 1. Ukusethwa kwe-DC2085 (sondeza ukuze uthole imininingwane)
UKUHLELWA KWE-HARDWARE
Ama-SMA
I-J2 & J3: Okokufaka Kwe-trigger Ehlukile. Faka isignali ku-J2 kusuka kumshayeli we-50Ω. Izihlungi ezibambayo ziyadingeka ekusebenzeni kweshidi ledatha. Sebenzisa i-J2 ne-J3 uma i-trigger iyisignali ehlukile.
J4: Sample Okokufaka Kwewashi. Faka isignali yewashi kulesi sixhumi se-SMA esivela kumshayeli we-50Ω. Umthombo wewashi ongu-0dBm kufanele wanele, kodwa ukuze uthole umsindo ongcono kakhulu wesigaba nokusebenza kwe-jitter, sebenzisa okuphezulu kakhulu ngangokunokwenzeka. ampizinga le-litude ne-slew, lifika ku-15dBm.
I-J5 & J6: Izimpawu Zokuphuma Ezihlukile. Lawa ma-SMA ahlinzeka ngokufinyelela emiphumeleni ehlukene ye-DAC. I-impedance yokuphumayo yakhelwe ukuthi ibe ngu-50Ω ku-SMA ngayinye, noma umehluko ongu-100Ω. Xhuma i-balun yangaphandle noma isihlanganisi kulawa maphini ukuze ushayele i-spectrum analyzer enesiphetho esisodwa. I-Linear Technology inamabhodi ekhuphoni ahlukahlukene amafrikhwensi athile nezinhlelo zokusebenza. Ulwazi olwengeziwe luyatholakala ku- www.linear.com.
J8: UKUVUMELANISA. Le SMA eyokunikeza ukufinyelela kuphinikhodi yokuvumelanisa ye-LT8614. Ayisetshenziswa ekusetshenzisweni okuvamile.
Ama-Turrets
+5V: I-Positive Input Voltage ye-DAC kanye Neziyingi Zedijithali.
Le voltage iphakela uchungechunge lwezilawuli ezihlinzeka ngevolumu efaneletageye-DAC. UmqulutagI-e range yale turret ingu-4.8V kuya ku-5.2V. Qaphela: Ngezigaba zomsindo wesigaba esiseduze, ukushayela le voltage ayilungile. Kukhona i-hump yomsindo eyaziwayo engu-20kHz ku-spectrum ekhiqizwa abalawuli. Ukuze uthole ukusebenza okungcono kakhulu kwesigaba somsindo, buyisela emuva izilawuli ze-onboard ngama-turrets anikeziwe asuka ekunikezeni umsindo ophansi.
GND: Ukuxhumana Kwaphansi. Leli bhodi ledemo linendiza eyodwa kuphela yaphansi. Le turret kufanele iboshwe kutheminali ye-GND yendawo kagesi esetshenziswayo.
I-SVDD3V0: Okokufaka kwe-3.0V Ongakukhetha. Le phinikhodi ixhumeke ngqo kuphinikhodi ye-SVDD ye-DAC. Idinga ukunikezwa okungaletha kufika ku-100mA. Ukushayela le phinikhodi kuzovala isilawuli se-onboard.
I-AVDD3V3: Okokufaka kwe-3.3V Ongakukhetha. Le phinikhodi ixhumeke ngqo kuphinikhodi ye-AVDD3V3 ye-DAC. Idinga ukunikezwa okungaletha kufika ku-200mA. Ukushayela le phinikhodi kuzovala isilawuli se-onboard.
I-DVDD3V3: Okokufaka kwe-3.3V Ongakukhetha. Le phinikhodi ixhumeke ngqo kuphinikhodi ye-DVDD3V3 ye-DAC. Idinga ukunikezwa okungaletha kufika ku-50mA. Ukushayela le phinikhodi kuzovala isilawuli se-onboard.
I-AVDD1V8: Okokufaka okungakhethwa kwe-1.8V. Le phinikhodi ixhumeke ngqo kuphinikhodi ye-AVDD1V8 ye-DAC. Idinga ukunikezwa okungaletha kufika ku-1A. Ukushayela le phinikhodi kuzovala isilawuli se-onboard.
I-DVDD3V3: Okokufaka kwe-1.8V Ongakukhetha. Le phinikhodi ixhumeke ngqo kuphinikhodi ye-DVDD1V8 ye-DAC. Idinga ukunikezwa okungaletha kufika ku-500mA. Ukushayela le phinikhodi kuzovala isilawuli se-onboard.
I-VP1: Leli iphoyinti lokuhlola elisekuphumeni kwesilawuli sokushintshwa kwe-onboard. Yenzelwe izinjongo zokuhlola.
Ingashayelwa futhi iye ku-2.5V ukuze ivale okukhiphayo kwesilawuli esishintshayo.
I-TSTP & TSTN: Lawa maphinikhodi aboshelwe ngqo ku-TSTP kanye ne-TSTN pin ye-DAC. Angasetshenziswa ukukala izinga lokushisa langaphakathi kanye nesikhathi okokufaka kwe-LVDS. I-FSADJ: Lena iphinikhodi ozikhethela yona eboshelwe ngqo kuphinikhodi ye-FSADJ ye-DAC. Ingasetshenziselwa ukusetha ukukhishwa kwesikali esigcwele se-DAC. Ekusebenzeni okuvamile le phinikhodi iboshelwa ku-GND nge-500Ω ukuze kusethwe imanje engu-40mA ekuphumeni.
I-REFIO: Le phini iboshelwe ngqo kuphinikhodi ye-REFIO ye-DAC futhi isetshenziselwa ukusetha ivolumu yereferensi.tage ye-DAC.
Ngokujwayelekile ngaphakathi isethwe ku-1.25V kodwa ingashayelwa kakhulu ngevolthi yangaphandletage kusuka ku-1.1V kuya ku-1.4V.
Abagxumayo
Isekhethi yokubonisa ye-DC2085 kufanele ibe nezilungiselelo ze-jumper ezilandelayo njengezindawo ezizenzakalelayo.
JP1: PD. Esimeni se-RUN le phinikhodi iholela ekusebenzeni okuvamile kwe-DAC. Esimeni se-SHN i-DAC yehliswa amandla. (Okuzenzakalelayo: RUN noma phezulu)
JP2: SPI kanye no-JTAG. Le jumper ikhetha ukuthi i-FPGA ihlelwe kanjani. Esimeni se-SPI i-FPGA ihlelwe isuka ku-chip ye-FTDI ekhona kanye nesofthiwe ye-LTDACGen. Ku-JTAG isikhundla i-J9 sisetshenziswa ne-JTAG uhlelo lokuhlela i-FPGA. (Okuzenzakalelayo: SPI noma phansi)
Izixhumi
J1: DC590. Lona unhlokweni ozikhethela wona ongasetshenziswa ukuhlela i-DAC nge-DC590. (Okuzenzakalelayo: kususiwe)
j9 :jTAG. Lona unhlokweni ozikhethela wona ongasetshenziswa ukuhlela i-FPGA ngokusebenzisa i-JTAG umhleli. (Okuzenzakalelayo: kususiwe)
j7: USB. Xhuma ikhebula le-USB ukusuka ku-J7 uye kwikhompyutha nge-software ye-LTDACGen efakiwe.
I-J10 & J11: Izixhumi ze-HSMC. Lezi zixhumi zenzelwe ukuxhuma ebhodini lokuthuthukisa i-Altera Stratix IV. Konke ukuxhumana phakathi kwe-FPGA ne-DAC kuhanjiswa ngalezi zixhumi.
UKUSEBENZISA AMANDLA KANYE NEZIMPAWU EMBUKENI WE-DC2085
Uma ibhodi ledemo le-Stratix IV lisetshenziselwa ukuhlinzeka ngedatha ku-DC2085, amabhodi amabili kufanele aqale aboshwe ndawonye futhi uxhumano olufanele kufanele lwenziwe. Uma i-Linear Technology inikeze ibhodi ye-Stratix IV kancane kancane file isivele ifakiwe kumemori ye-flash futhi izoqala ukusebenza uma ibhodi selivuliwe. Uma kusetshenziswa ibhodi le-FPGA elingahleliwe, bheka imibhalo efanelekile yokuthi lihlelwa kanjani.
Amandla kufanele asetshenziswe ohlelweni ngale ndlela:
- Xhuma ibhodi ye-Altera kugesi onikeziwe.
- Xhuma ikhebula le-USB ku-J7.
- Faka iwashi ku-J4.
- Xhuma noma yiliphi ibhodi lokuphumayo ozikhethela lona ku-J5 naku-J6.
- Vula ivolumutage ebhodini le-Altera.
- Xhuma i-5V kusuka ebhentshini ukuya ku-+5V turret ku-DC2085.
- Vula isofthiwe ye-LTDACGen bese ucindezela u-Connect.
I-LTDACGen kufanele ibike ukuthi ixhunywe ku-FPGA. Bheka Umfanekiso 2:
Umfanekiso 2. LTDACGen Ixhumeke ku-FPGA
I-ANALOG OUTPUT NETWORK
Inethiwekhi yokuphuma kwe-analog ye-DC2085 yakhelwe ukukhulisa ukusebenza kwe-LTC2000.
I-LTC2000 ishayela izimbangi ezimbili ze-50Ω ohlangothini ngalunye ukuze kuncishiswe i-impedance eyibonayo. Lokhu kukhulisa i-SFDR iDAC ekwazi ukuyikhiqiza. Uma ukushwibeka kwesignali okukhudlwana kuyadingeka lokhu kuphazamiseka kungakhushulwa, kodwa i-SFDR ingase yehlise izinga. Okukhiphayo kuphinde kube nenethiwekhi ye-pi yama-resistor angu-50Ω ukuze kuphedisise ukukhinyabezeka kokukhishwayo kwebhodi kufika ku-50Ω ohlangothini ngalunye. Lokhu kuvumela ibhodi ledemo ukuthi lishayele isihlaziyi esingu-50Ω nge-balun noma esinye isihlanganisi.
I-Linear Technology inamabhodi ekhuphoni ahlukahlukene amafrikhwensi athile nezinhlelo zokusebenza. Ulwazi olwengeziwe luyatholakala ku- www.linear.com.
SAMPIWASHI LE
I-sampIwashi lewashi eliya ebhodini lesekhethi ye-DC2085 limakwe ngokuthi J4. Njengokuzenzakalelayo iyimbobo yokufaka engu-50Ω enesiphelo esisodwa. Kukhona ibhaluni elisebhodini eyenza ukuhumusha okuhlukile.
Ukuze uthole ukusebenza okuhle kakhulu komsindo, i-sampi-le input kumele ishayelwe ngomthombo ophansi kakhulu wesiginali ye-jitter.
I ampi-litude kufanele ibe nkulu ngangokunokwenzeka ifike ku-±1.8V noma 9dBm.
SOFTWARE
Isofthiwe ye-DC2085, LTDACGen itholakala ku-www.linear.com mahhala. Kwenza kube lula ukudalwa kwamagagasi ayinkimbinkimbi futhi awalayishe ku-FPGA ukuhlola i-DC2085. Ukuze uthole ulwazi olwengeziwe mayelana nendlela yokusebenzisa isofthiwe ye-LTDACGen, bheka usizo files eza nesofthiwe.
IMIPHUMELA
Ngemuva kokuthi yonke into isimisiwe futhi isoftware ixhunywe ohlelweni lwedemo ye-DAC, i-sine wave ingangezwa kufomu lokukhiphayo. Imvamisa ezenzakalelayo ingu-399.932861328MHz (Umfanekiso 3). Ngokuchofoza Buyekeza i-FPGA, idatha ithunyelwa ku-FPGA bese isetshenziselwa ukuhlela i-DAC. I-spectrum analyzer ingase isetshenziselwe ukwenza kanjalo view imiphumela (Umdwebo 4).
Umfanekiso 3. Imvamisa ezenzakalelayo
Umfanekiso 4. Imiphumela ye-DC2085. Vala ngaphakathi (Phezulu) kanye ne-Wideband (Phansi)
IZINGXENYE ZOKUFUNDA
UHLELO LWESICWANGCISO
ISAZISO ESIBALULEKILE IBHODI LOKUBONISA
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LINEAR TECHNOLOGY LTC2000-16 Demonstration Circuit [pdf] Umhlahlandlela wokufaka LTC2000-16 Demonstration Circuit, LTC2000-16, Demonstration Circuit, Circuit |