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--- en:adcdual [2018/12/18 15:23] – fluktuacia
+++ en:adcdual [Unknown date] (current) – external edit (Unknown date) 127.0.0.1
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-FIXME **This page is not fully translated, yet. Please help completing the translation.**\\ //(remove this paragraph once the translation is finished)//
+====== Analog-to-digital converter - ADCdual01A ======
+A fast two-channel analog-to-digital converter. Input connector is a differential SATA connector - one for both analog channels. Output connector is a serial-parallel LVDS output to differential SATA connector:
-====== Analog-to-digital convertor - ADCdual01A ======
-A fast two-channel analog-to-digital convertor. Input connector is a differential SATA connector - one for both analog channels. Output connector is a serial-parallel LVDS output to differential SATA connector:
 {{:cs:modules:adc:adcdual01a_bottom_big.jpg?600|}}
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   * Sampling jitter < 100m
-Currently, the problem is tackled on a professional level by proprietary digitising units (([[http://arxiv.org/abs/1305.3550|LOFAR]])) or more in amateur conditions by a system of multichannel sound cards (([[http://fringes.org/|Fringe Dwellers "Simple"]]))(([[http://radiojove.gsfc.nasa.gov/|Radio JOVE Project]])).
+Currently, the problem is tackled on a professional level by proprietary digitising units (([[http://arxiv.org/abs/1305.3550|LOFAR]])) or in more amateur conditions by a system of multichannel sound cards (([[http://fringes.org/|Fringe Dwellers "Simple"]]))(([[http://radiojove.gsfc.nasa.gov/|Radio JOVE Project]])).
 === Choice of ADC ===
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 So far, probably the most perspective is the usage of serial LVDS that requires the smallest number of differential signal pairs, making the whole construction simpler. (([[http://www.ti.com/lit/pdf/snaa110|Data Converter Serial LVDS Interface Improves Board Routing]]))
-If we limit the choice of ADC by a requirement for serial LVDS output for each ADC channel individually, there will only be a few suitable circuits. Texas Instruments does not produce such fast 16 bit transducers at all and even their slower variants do not have LVDS output. Analog Devices, on the other hand, does not have ADC with serial data output with a bit with of interface smaller than 4bit/channel.
+If we limit the choice of ADC by a requirement for a serial LVDS output for each ADC channel individually, there will only be a few suitable circuits. Texas Instruments does not produce such fast 16 bit transducers at all and even their slower variants do not have LVDS output. Analog Devices, on the other hand, does not have ADC with serial data output with a bit with of interface smaller than 4bit/channel.
 We are left with a choice from the company Linear technology:
-either [[http://www.linear.com/product/LTC2271|LTC2271]]
+either [[http://www.linear.com/product/LTC2271|LTC2271]] or products from the [[http://www.linear.com/product/LTC2191|LTC2190-2195]] series.
-or products from the [[http://www.linear.com/product/LTC2191|LTC2190-2195]] series.
-As can be seen, the whole ADC series from Linear technology is more or less the same (the converters are even mutually interchangeable between the PCB), they only differ in sampling frequency and S/N ratio. The slowest one of them
+As can be seen, the whole ADC series from Linear technology is more or less the same (the converters are even mutually interchangeable between the same PCB layout), they only differ in sampling rates and S/N ratio. The slowest one of them can be used for sampling rate of 20 MHz. The slowest sampling rate that it is able to carried out is 5 MSPS. All converters from this category are more or less configurable and all ADCs’ (even others than made by Linear Technology) have SPI interface for configuration.
-Jak je vidět, tak celá tato série ADC od Linear technology je víceméně stejná (dokonce jsou převodníky i
-navzájem záměnné na stejně navrženém PCB), liší se pouze vzorkovací
-frekvencí a poměrem S/N. Nejpomalejší z nich je však pro 20 MHz. Nejpomalejší
-vzorkování na kterém ho lze provozovat je 5 MSPS.
-Všechny převodníky této kategorie jsou taky určitým způsobem
-konfigurovatelné. A všechny ADC této kategorie (i jiné než od Linear Technology )mají pro konfiguraci rozhraní SPI.
-===== Související stránky =====
+===== Related sites =====
-  * [[cs:adcoctospi|ADCoctoSPI]]
+  * [[en:adcoctospi|ADCoctoSPI]]
-  * [[cs:aras|pokročilá radioastronomická stanice]]
+  * [[en:aras|pokročilá radioastronomická stanice]]
-===== Reference =====
+===== Refferences =====
-==== Existující grabovací karty ====
+==== Existing grabbing cards ====
   * [[http://ultraviewcorp.com/displaynews.php?news_id=4|AD8-3000 High Speed Data Acquisition]]
@@ Line 78: / Line 68: @@
   * [[http://rtcmagazine.com/articles/view/101915|PX1500-2]]
-Problematickými parametry těchto karet jsou zejména velmi vysoká cena, zbytečně vysoká vzorkovací frekvence a malý dynamický rozsah. A nebo velký dynamický rozsah ale naopak extrémně nízká vzorkovací frekvence.
+There are several problems with these devices - especially their high price, unnecessarily high sampling rates and small dynamic range or, on the contrary, large dynamic range, but extremely low sampling rates.