#DAISY-20 - A/D @ 0-10 volt interface

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The Daisy-20 is a front-end module for 4 channel built-in A/D converter available on the Terra and FOXG20 boards.
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<img src="./DAISY-20.jpg">

DAISY-20 integrates on each channel:

* a potential divider to read a tension range of 0-10 volts 
* an over voltage and polarity inversion protection stage 
* a rail-to-rail linear amplifier to reduce the signal to noise ratio
* an analog level status led 
* a placement for through-hole mounting resistor to change the potential divider ratio

There is also a high precision voltage reference chip [TS4040](http://www.datasheetcatalog.org/datasheet/stmicroelectronics/7295.pdf)

#Pinout

The A/D lines are available on a pluggable terminal block with a pitch of 3.8 mm.

Pin	| Signal
----|--------
GND	| GND signal
AD0 | Analog line 0 in range of 0 to 10 volt
AD1 | Analog line 1 in range of 0 to 10 volt
AD2 | Analog line 2 in range of 0 to 10 volt
AD3 | Analog line 3 in range of 0 to 10 volt
3V3	| 3V3 volt output 


#Wirings

The daisy connectors where to plug this board are:

| Board  | Daisy Connector | 
|--------|-----------------|
| FOXG20 | D4    |
| TERRA  | D14   |

On the FOX Board G20 is requested a [Daisy-1](/DAISY-1) adapter.


#Schematic

* [Daisy-20 Schematic](http://terzo.acmesystems.it/download/schematics/schematic_daisy20.pdf)

#Related links

* @article='adc'
* [TS4040 - 2.5v micropower shunt voltage reference datasheet](http://www.datasheetcatalog.org/datasheet/stmicroelectronics/7295.pdf)
* [MCP6291 - Rail-to-Rail Op Amp datasheet](http://ww1.microchip.com/downloads/en/DeviceDoc/21812e.pdf)

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