AD7305

a FEATURES Four 8-Bit DACs in One Package +3 V, +5 V and ؎ 5 V Operation Rail-to-Rail REF-Input to Voltage Output Swing 2.6 MHz Reference Multiplying Bandwidth Compact 1.1 mm Height TSSOP 16-/20-Lead Package Internal Power ON Reset SPI Serial Interface Compatible—AD7304 Fast Parallel Interface—AD7305 40 ␮ A Power Shutdown APPLICATIONS Automotive Output Span Voltage Instrumentation, Digitally Controlled Calibration Pin-Compatible AD7226 Replacement when V DD < 5.5 V VDD PWR ON RESET +3 V/+5 V, Rail-to-Rail Quad, 8-Bit DAC AD7304/AD7305* FUNCTIONAL BLOCK DIAGRAMS VREFB VREFA INPUT 8 REG A 8 INPUT 8 REG B CS SDI/SHDN CLK SERIAL REG INPUT 8 REG C INPUT 8 REG D DAC B 8 REG DAC C 8 REG DAC D 8 REG DAC B VOUTB DAC A REG 8 DAC A VOUTA DAC C VOUTC DAC D VOUTD AD7304 VSS GND VDD CLR LDAC VREFC VREFD VREF INPUT 8 REG A INPUT 8 REG B INPUT 8 REG C 8 INPUT 8 REG D WR A0/SHDN A1 DECODE DAC D 8 REG DAC D VOUTD DAC A 8 REG DAC B 8 REG DAC C 8 REG GENERAL DESCRIPTION The AD7304/AD7305 are quad, 8-bit DACs that operate from a single +3 V to +5 V supply or ± 5 V supplies. The AD7304 has a serial interface, while the AD7305 has a parallel interface. Internal precision buffers swing rail-to-rail. The reference input range includes both supply rails allowing for positive or negative fullscale output voltages. Operation is guaranteed over the supply voltage range of +2.7 V to +5.5 V, consuming less than 9 mW from a +3 V supply. The full-scale voltage output is determined by the external ref...