The AD7396/AD7397 series of dual， 12-bit and 10-bit voltageoutput digital-to-analog converters are designed to operate from a single +3 V supply. Built using a CBCMOS process， these monolithic DACs offer the user low cost and ease of use in single supply +3 V systems. Operation is guaranteed over the supply voltage range of +2.7 V to +5.5 V， making this device ideal for battery operated applications. A 12-bit wide data latch loads with a 45 ns write time allowing interface to fast processors without wait states. The double buffered input structure allows the user to load the input registers one at a time， then a single load strobe tied to both LDA+LDB inputs will simultaneously update both DAC outputs. LDA and LDB can also be independently activated to immediately update their respective DAC registers. An address input （A/B） decodes DACA or DACB when the chip select CS input is strobed. Additionally， an asynchronous RS input sets the output to zero-scale at power on or upon user demand. Power shutdown to submicroamp levels is directly controlled by the active low SHDN pin. While in the power shutdown state register data can still be changed even though the output buffer is in an open circuit state. Upon return to the normal operating state the latest data loaded in the DAC register will establish the output voltage.