Differential ADC on Atmega88

P_Santos · Joined: 07 Jul 2011 Posts: 114

Hello,

I need to connect a device with differential output to the Atmega88 ADC. Never used the ADC differential, I do not know what pins connect as not found any sample code to read the ADC in differential mode.

Gratefull if anyone can help with schematic and sample code

Regards
P_Santos

(BASCOM-AVR version : 2.0.8.1 , Latest : 2.0.8.2 )

laborratte · Joined: 27 Jul 2005 Posts: 299 Location: Berlin

atmega88 does not have differential inputs on ADC

P_Santos · Joined: 07 Jul 2011 Posts: 114

Hello Laborratte,

Thanks for the information, have than will to use an external differential Amp OP

Regards
P_Santos

Paulvk · Joined: 28 Jul 2006 Posts: 1257 Location: SYDNEY

Have a look at the MAX1238 I have written code here
https://www.mcselec.com/index2.php?option=com_forum&Itemid=59&page=viewtopic&t=11496&highlight=adc

Much better than the 10 bit avr adc

Note Also the artwork for a circuit board is there if you want it
it can use the Max1238 or ADC128D818
Regards Paul

P_Santos · Joined: 07 Jul 2011 Posts: 114

Thank you, Paulvk,

I need a instrumention differential amplifier, now i find the MCP6N11, this device works beetwen 1,7v and 5V and that it's what i need, the board use a 3V battery

Anyone use the MCP6N11 ?

Regards
P_Santos