DAC0854 Quad 8-Bit Voltage-Output Serial Digital To Analog Converter with Readback IC DIP-20

General Description

The DAC0854 is a complete quad 8-bit voltage-output digital to-analog converter that can operate on a single 5V sup-ply. 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 de-sign and reduces the cost of systems which need to verify data integrity. The logic comprises a MICROWIRE TM-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.

Features

• Single a5V supply operation
• MICROWIRE serial interface allows easy interface to many popular microcontrollers including the COPSTM and HPCTM families of microcontrollers
• Data readback capability
• Output data can be formatted to read back MSB or LSB first
• Versatile logic allows selective or global update of the DACs
• Power fail flag
• Output amplifiers can drive 2 kΩ load
• Synchronous/asynchronous update of the DAC outputs

Applications

• Automatic test equipment
• Industrial process controls
• Automotive controls and diagnostics
• Instrumentation

Absolute Maximum Rating

• Supply Voltage (AVCC, DVCC): 7V
• Supply Voltage Difference (AVCC-DVCC): ±5.5V
• Voltage at Any Pin (Note 3): GND-0.3V to AVCC/DVCC+0.3V
• Input Current at Any Pin (Note 3): 5 mA
• Package Input Current (Note 4): 20 mA
• Power Dissipation (Note 5): 105 mW
• ESD Susceptibility (Note 6): 1250V