The AD5780 is a true 18-bit, unbuffered voltage output digitalto-analog converter (DAC) that operates from a bipolar supply of up to 33 V. The AD5780 accepts a positive reference input range of 5 V to VDD− 2.5 V and a negative reference input range of VSS+ 2.5 V to 0 V. Both reference inputs are buffered on chip and external buffers are not required. The AD5780 offers a relative accuracy specification of ±1 LSB maximum range, and operation is guaranteed monotonic with a ±1 LSB differential nonlinearity (DNL) maximum range specification.The part uses a versatile 3-wire serial interface that operates at clock rates of up to 35 MHz and is compatible with standard serial peripheral interface (SPI), QSPI™, MICROWIRE™, and DSP interface standards. The part incorporates a power-on reset circuit that ensures that the DAC output powers up to 0 V in a known output impedance state and remains in this state until a valid write to the device takes place. The part provides an output clamp feature that places the output in a defined load state.Product HighlightsTrue 18-bit accuracy.Wide power supply range of up to ±16.5 V.−40°C to +125°C operating temperature range.Low 8 nV/√Hz noise.Low ±0.018 ppm/°C gain error temperature coefficient.ApplicationsMedical instrumentationTest and measurementIndustrial controlScientific and aerospace instrumentationData acquisition systemsDigital gain and offset adjustmentPower supply control