LDC1000 inductance-to-digital converter (LDC) from Texas Instruments

[vbeeeks]

Looks a promising new entrant to MD tech. I recently called fr free samples of LDC1000 as I cannot lay hands on LDC1000EVM more conducive to demo & experiments - so before anything else I've got to fab a pcb. But fr those who can lay hands on may get ahead of experimenting. Some links that may be useful:
http://blog.hendriklipka.de/archives...1000_test.html
http://www.edn.com/electronics-produ...eeds-invention

[vbeeeks]

LDC1000 can be useful to discriminate by the method of elimination / subtraction of undesired signals as in lock in amplifiers. Samples (minute particles of undesired ones) are there on-board in the form of tablets and are always sampled by the multiple LDC1000. The digital signatures are fed in to subtract those signals from the already proven coils front-ends from the forum. The LDC1000-coil will swing ( like heads of hard-disk/floppy) on the platter samples of dis-interest and the digital signals will be subtracted from the sampled front-end. This way one can achieve eliminating grounds as well - one can have multiple ground type tablets along with the known undesired items in their locality. I know this method is not formulated in the forum so more experimenting will have to be done.

[bklein]

Anyone experimenting with this eval kit at present? I just got mine.
BTW, web bench has support for it and can design your pcb.

[WM6]

Anyone experimenting with this eval kit at present? I just got mine.
BTW, web bench has support for it and can design your pcb.

I am thinking of possible use two of LDC1000 in pocket magnetic suceptibility meter design, but not experimented something this way yet.
Some other projects are on priority list right now.

[bklein]

Would this part's design approach be most applicable to BFO designs or some other?
In the book "Inside the Metal Detector" it seems to recommend a frequency of 100KHz for BFO type.
It seems this may be the approach taken on the MD20 but the MD20 is 300KHz and the text says skin effect takes over when frequency is above 100KHz - so why 300Khz??

[WM6]

- so why 300Khz??

At higher frequency you can get better frequency beat - mean more audible audio frequency from the small difference (changes) between the search oscillator and the reference oscillator.