The AD7949 is an 8-channel， 14-bit， charge redistribution successive approximation register （SAR） analog-to-digital converter （ADC） that operates from a single power supply， VDD. The AD7949 contains all components for use in a multichannel， low power data acquisition system， including a true 14-bit SAR ADC with no missing codes; an 8-channel， low crosstalk multiplexer that is useful for configuring the inputs as singleended （with or without ground sense）， differential， or bipolar; an internal low drift reference （selectable 2.5 V or 4.096 V） and buffer; a temperature sensor; a selectable one-pole filter; and a sequencer that is useful when channels are continuously scanned in order. The AD7949 uses a simple SPI interface for writing to the configuration register and receiving conversion results. The SPI interface uses a separate supply， VIO， which is set to the host logic level. Power dissipation scales with throughput. The AD7949 is housed in a tiny 20-lead LFCSP with operation specified from ?40°C to +85°C.