MCP3208 A/D - Electronic Circuits Projects Diagrams Free

Scarr · 26th July 2004, 09:35 PM

Hi,
I have a MCP3208 and I want to monitor a 1.5v battery with it, I'm pretty new to A/D so I have a few questions.

VREF, should I use a special reg for this? also if I set VREF to 2v will I get more accurate result becuase the range is now only 0v-2v and not 0v-5v?

Hope I'm making sense

)

Thanks

Exo · 26th July 2004, 11:04 PM

If you need high accuracy you can use a precision voltage reference like the REF03 (2.5V)
http://www.analog.com/UploadedFiles/...177REF03_f.pdf

but, for the purpose of a battery monitor I would think a zener would do...

And yes indeed, if you lower your VREF to 2V then the result will be more accurate.

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26th July 2004, 09:35 PM	(permalink)
Scarr	MCP3208 A/D Hi, I have a MCP3208 and I want to monitor a 1.5v battery with it, I'm pretty new to A/D so I have a few questions. VREF, should I use a special reg for this? also if I set VREF to 2v will I get more accurate result becuase the range is now only 0v-2v and not 0v-5v? Hope I'm making sense ) Thanks

26th July 2004, 11:04 PM	(permalink)
Exo	If you need high accuracy you can use a precision voltage reference like the REF03 (2.5V) http://www.analog.com/UploadedFiles/...177REF03_f.pdf but, for the purpose of a battery monitor I would think a zener would do... And yes indeed, if you lower your VREF to 2V then the result will be more accurate.