minor problem with DIR 1703

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Hi; I'm having a minor problem with a DIR 1703. Everything works okay except it has a intermintant clicking in the right channel. I know the rest of the circuit following the 1703 in okay because the ADC does not have this problem. The 2 circuits(ACD/DIR) are switched through a 74HC257 data selector to a digital filter and then to the DACs. I've tryed everything I can think of but nothing I do fixes this problem. Any suggestions would be great.
Thanks
 
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