The AD768 is a 16-bit, high speed digital-to-analog converter (DAC) with excellent ac and dc performance. Fabricated using Analog Devices' advanced bipolar CMOS (ABCMOS) process, it combines the speed of a bipolar transistor, the accuracy of laser-trimmed thin-film resistors, and the efficiency of CMOS logic. The segmented current source architecture combined with proprietary switching technology reduces surge energy for maximum dynamic accuracy. The device also integrates edge-triggered input latches and a temperature-compensated bandgap reference, providing a complete monolithic DAC solution.
The AD768 is a current output DAC with a nominal full-scale output current of 20 mA and an output impedance of 1 kΩ. It provides differential current outputs to support single-ended or differential applications. The current output can be connected directly to the output or sent to the sum point of the high-speed amplifier to provide a buffered voltage output. In addition, the differential output can interface with transformers or differential amplifiers.
The on-chip reference and control amplifier are configured for maximum accuracy and flexibility. The AD768 can be driven by an on-chip reference or, depending on the external resistor, driven by a variety of different external references. With an external capacitor, the user can make the best compromise between reference bandwidth and noise performance.
The AD768 operates from a ±5 V supply, typically consumes 465 mW, is available in a 28-lead SOIC package, and is specified over the industrial temperature range.