Unterschiede

Hier werden die Unterschiede zwischen zwei Versionen angezeigt.

--- ad7190:quad-delta-sigma-board [2016/02/22 13:15] – angelegt karl
+++ ad7190:quad-delta-sigma-board [2016/03/31 16:13] (aktuell) – [Downloads] dokuwikiadmin
@@ Zeile 2: / Zeile 2: @@
 -02-22
-x AD7190 + Arduino Nano
+x AD7190 + Arduino Nano \\
+See also [[:ad7190|The ultra low noise 24-bit ADC: AD7190]]
+This board implements a 4 channel, ultra low noise, simultaneous sampling, 24 bit ADC. It has a dedicated oscillator and the sync line is conneted to all 4 ADCs. Its indended use is to read out 4 strain gauge weighing cells in a 6-wire configuration.
+With an external reference voltage it can be used for direct voltage measurements too.
+The digital part is supplied by the USB-port, and the analog part must be supplied seperately from a low noise 5V power supply ([[:uln-power-supply|see Ultra Low Noise Linear Power Supply, using LT3042]]).
+On each ADC only one out of two differential channels is used. See also [[:multi-delta-sigma|Mehrkanal Delta-Sigma ADCs und das Abtasttheorem]].
 ===== Top View =====
-{{:ad7190:quad-board-top.png?direct&600|}}
+{{ :ad7190:quad-board-top.png?direct&600 |}}
 ===== Bottom View =====
-{{:ad7190:quad-board-bot.png?direct&600|}}
+{{ :ad7190:quad-board-bot.png?direct&600 |}}
+===== Configuration =====
+{{ :ad7190:2016-02-22_002.png?direct&600 |}}
+===== Assembled Board =====
+Here the blue wire was needed to supply the Arduino with 5V, because the USB-connector had an up-bent leg before soldering, and therefore the V+ pin was not connected to the Arduino-PCB. When I fixed this, I removed the blue wire.
+{{ :ad7190:dsc_1080.jpg?direct&300 |}}
+R-Core transformer, 230V to 2x 9V. This type of transformer has the least capacitive coupling. It's good to avoid common mode currents.
+{{ :ad7190:dsc_1082.jpg?direct&300 |}}
+Here a close up of the board:
+{{ :ad7190:dsc_1084.jpg?direct&300 |}}
+Between the transformer and the ADC-board there is the [[:uln-power-supply|Ultra Low Noise Linear Power Supply, using LT3042]]
+{{ :ad7190:dsc_1085.jpg?direct&300 |}}
+===== Downloads =====
+  * {{:ad7190:kicad-quad-delta-sigma-1.0.7z|KiCad Project, V1.0}}
+  * {{:ad7190:quad-delta-sigma-board-v1.0.pdf|Schematic, V1.0}}