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Of possible interest...



Original poster: "Dave Halliday" <dh@xxxxxxxxxxxxxx>

Don Lancaster at Tinaja.com writes that Analog Devices has some
fascinating new chips

http://www.tinaja.com/whtnu05.asp
(he doesn't support permalinks so scroll down to the August 5th entry)

High precision capacitance measurement:

http://www.analog.com/UploadedFiles/Data_Sheets/589912317314AD7747_prb.p
df

<<http://www.analog.com/UploadedFiles/Data_Sheets/21450359AD7745_6_0.pdf#>http://www.analog.com/UploadedFiles/Data_Sheets/21450359AD7745_6_0.pdf#
xml=http://search.analog.com/search/pdfPainter.aspx?url=http://www.analo
g.com/UploadedFiles/Data_Sheets/21450359AD7745_6_0.pdf&fterm=capacitance
-to-digital&fterm=capacitance-to-digital&la=en>

<<http://www.analog.com/UploadedFiles/Data_Sheets/21450359AD7745_6_0.pdf#>http://www.analog.com/UploadedFiles/Data_Sheets/21450359AD7745_6_0.pdf#
xml=http://search.analog.com/search/pdfPainter.aspx?url=http://www.analo
g.com/UploadedFiles/Data_Sheets/21450359AD7745_6_0.pdf&fterm=capacitance
-to-digital&fterm=capacitance-to-digital&la=en>

Lesser precision (but still darn good) impedance measurement:

<http://www.analog.com/en/prod/0%2C2877%2CAD5933%2C00.html>

Evaluation board for above:

<<http://www.analog.com/UploadedFiles/Evaluation_Boards_Tools/172972831EV>http://www.analog.com/UploadedFiles/Evaluation_Boards_Tools/172972831EV
AL_AD5933EB_pra.pdf>