I am using MCP3204 in one the projects. It is a 12bit, 4 channel serial
interface ADC from Microchip.
According to datasheet, the maximum count (0x0FFF or 4096) is received when
input voltage is equal to Vref. Now my problem is that I get max count at
half Vref. I have applied 4.000 volt as Vref. I get max count at 2.0 volt.
But that is not all. The ADC again counts from 0000 to 4096 for 2.00 to 4.00
volts. I checked my circuit. I even applied simple DC voltage through 10K
pot. But the result is same.

I have also replaced the IC couple of times.

Has any one seen this problem? Any solution?

Vyas
web: www.sjvyas.com

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