The AD8803ARZ is an octal 8-bit Digital-to-analog Converter (DAC) with power shutdown. It provides eight digitally controlled DC voltage outputs. This potentiometer divider TrimDAC? allows replacement of the mechanical trimmer function in new designs. The AD8803 provides independent control of both the top and bottom end of the potentiometer divider allowing a separate zero-scale voltage setting determined by the VREFL pin. This helpful for maximizing the resolution of devices with a limited allowable voltage control range. This DAC registers are updated from an internal serial-to-parallel shift register that is loaded from a standard 3-wire serial input digital interface. Eleven data bits make up the data word clocked into the serial input register. This data word is decoded where the first 3-bit determine the address of the DAC register to be loaded with the last 8-bit of data. The AD8803 consumes only 5μA from 5V power supplies.
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