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Core-Microconverter-Slide42

For the bipolar transfer function, zero scale is represented by 0xF0000000 hex and full scale by 0x0FFE0000 hex. Note that the full scale result is not 0x0FFF0000 due to the fact that the differential result is +/-11 bits. When the ADC result is positive, the sign bit will be zero. For example, for a V+ input of 1.25V and a V- input of 1V the ADC will read the difference as 250mV. Assuming a reference value of 2.5V, the ADC will convert this value to 0x01980000 hex which converts to 249mV.

PTM Published on: 2006-06-30