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A/D: AD7821

UP/DN: 74191

Adder: 7483

Register: 74198

Im cascading the 74191 and the 7483 to get 8 bit versions. its an 8-bit integrator. The problem Im getting is that when I feed a sine wave into an ADC, then feed the ADC into the up/dn counter, the up/dn counter overflows real fast. Basically what I am trying to do is Count up when the signal is rising, and count down when the signal is falling. Im not sure if I am cascading the counters right or what the problem might be, ive tried many things but am completely stumped.... any help would be appreciated. thanks in advance.