PSN-L Email List Message
Subject: Re: AD7142 ?
From: Jim Hannon jmhannon@.........
Date: Wed, 12 Apr 2006 22:59:46 -0500
I got some samples the other day. I think they will be usefull. Going to
wire them up to a USB adaptor.
Brett Nordgren wrote:
> 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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