Delta-Sigma Converter

[leonel]

You're right Dave. I took a better look after, and i read what you say.
Probably i will follow you're advise, but first i will see if there are another cheaper solution... (but i don't think so...)

Thank you.

[Charles Linquis]

Have you thought of amplifying the sensor's output with an op-amp before you feed it into the A/D?

A gain of 1000 isn't hard to do with one or two stages. Your 3.3mV p-p would then be 3.3V p-p.

[leonel]

yes, i already thought... It was my first solution.
But micro-power opamps are expensive, and consumes a little more than MCP3553.