PSN-L Email List Message

Subject: AD7142 ?
From: Brett Nordgren Brett3kg@.............
Date: Wed, 12 Apr 2006 14:19:39 -0400

Hi All,

Has anyone looked at the Analog Devices AD7142 Capacitance to Digital 
Converter?  I wonder if it might be useful for amateur seismometers.

They sell an evaluation board that has all the electronics to give both I2C 
and USB data outputs.

Specs seem quite good.
With a typical balanced-capacitance sensor, +/- 1mm spacing, at a 50Hz 
sample rate, they claim specs equivalent to:

0.17 nm /degC temp drift
0.3nm / sqrt-Hz noise
2.1 nm RMS noise
14 nm p-p noise
Resolution (24bit) much better than the noise.

Any thoughts on why this wouldn't make a good starting point?



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