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problem with adc tda8703

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Telfo2002

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tda8703

I was building a PC based oscilloscope based on a parallel port and a tda8703 plus some glue logic. However i was having terrible problems with noise (in form of some spikes).
Hardware is simple. Just a 74als244 connected to parallel port for data in(in epp mode). In one extreme and tda8703 in the other. Adc clock is 24MHz.
Some example circuits or tricks for using a tda8703 without noise?
Thanks in advance for your help.
 

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