hi friends,

 im using spartan 3e kit , and using the preamplifier and adc for analog
capture, but when i see the output on chip scope there is a lot of noise... 

 the input at the pre amp is only about 60mvp-p  ... if i increase it beyond
this there is a mirror image kind of effect on higher values of the signal ( i
have taken care of two's compliment issue) ,, 
the pre-amp (ltc 6912-1)is configured for -1 gain .. and im using only one
channel...
also i would like to know the valid input range to the pre-amplifier...as the
ref is already 1.6v... 

          has anybody worked on this ?

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