The ADC12048 is a 12-bit + sign, parallel I/O, self-calibrating, sampling analog-to-digital converter (ADC) with an eight input fully isdifferential analog multiplexer manufactured by National Semiconductor. It has a maximum sampling rate of 216 kHz and can be self-calibrated for linearity, zero and full-scale errors. The ADC12048's 8-channel multiplexer is software program- mable to operate in a variety of combinations of single-ended, differential, or pseudo-differential modes. The fully differential MUX and the 12-bit + sign ADC allows for the difference between two signals to be digitized. The ADC12048 can be configured to work with many popular microprocessors/microcontrollers and DSPs including Na- tional's HPC family, Intel386 and 8051, TMS320C25, Mo- torola MC68HC11/16, Hitachi 64180 and Analog Devices ADSP21xx. For complementary voltage references see the LM4040, LM4041 or LM9140.