The ICL7109CPL+ is a 12-bit A/D Converter with 3-state binary outputs. The ICL7109 is a monolithic 12-bit A/D converter designed for easy interface with microprocessors and UARTs. The 12-bit binary plus polarity and over-range outputs can be directly interfaced to a micro-processor bus. In this mode the ICL7109 is controlled by the microprocessor through the chip select and two byte enable inputs. For remote data logging applications the ICL7109 outputs are easily converted to a UART handshake mode, working with industry standard UARTs to provide serial data transmission. This device offers high accuracy by lowering rollover error to less than 1 count and zero reading drift to less than 1μV/°C. In many data acquisition systems the ICL7109 is an attractive, one-per-channel alternative to analogue multiplexing due to its low power consumption and input bias current.
