A 13-bit analog interface for microprocessor-based systems

Describes an integrated data-acquisition system designed as a microprocessor peripheral. The analog functions are centered around a 13-bit self-calibrating analog-to-digital converter and a bandgap reference. The digital section holds a sequencer and a FIFO in order to reduce the number of interrupts presented to the CPU while the chip is scanning automatically up to 8 analog inputs. Special design techniques are described to reduce the injection of digital noise during conversion and to preserve the accuracy of the analog section inside a high speed digital environment