DAC0854

The DAC0854 is a complete quad 8-bit voltage-output digital- to-analog converter that can operate on a single 5V supply. It includes on-chip output amplifiers, internal voltage reference, and a serial microprocessor interface. By combining in one package the reference, amplifiers, and conversion circuitry for four D/A converters, the DAC0854 minimizes wiring and parts count and is hence ideally suited for applications where cost and board space are of prime concern.

The DAC0854 also has a data readback function, which can be used by the microprocessor to verify that the desired input word has been properly latched into the DAC0854's data registers. The data readback function simplifies the design and reduces the cost of systems which need to verify data integrity.

The logic comprises a MICROWIRETM-compatible serial interface and control circuitry. The interface allows the user to write to any one of the input registers or to all four at once. The latching registers are double-buffered, consisting of 4 separate input registers and 4 DAC registers. Double buffering allows all 4 DAC outputs to be updated simultaneously.

The four reference inputs allow the user to configure the system to have a separate output voltage range for each DAC. The output voltage of each DAC can range between 0.3V and 2.8V and is a function of VBIAS, VREF, and the input word.