I would like to know which sensor chip, LDC1612, LDC0851 or other, would be best to sense a metal object as small as a staple at a distance of 2 to 4 mm? I have tried the LDC0851 evaluation board and was not successful in detecting an object as small as a staple. Can someone point me in the right direction of which TI chip and coil would be best for my application?