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ADC Wrong Result

Hi All.

I used LPC2103 ADC Channel 0 in my program, Every Setting is Correct But I read the result Always 1023 or Some less. I think its pulled up internally, because when i connect the ADC.0 to ground it will sink 60mA ??????
IODIR=0x0;
SCS =1 ;
and the PINsel is connected to ADC.

Please Help

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