AD7243AR

Overview

The AD7243AR is a monolithic 12-bit voltage output digital-to-analog converter fabricated on Linear Compatible CMOS (LC2MOS) technology. It integrates an output amplifier and a Zener voltage reference, eliminating the need for external trimming. The device supports single or dual supply operation, providing selectable unipolar ranges of 0 V to +5 V or 0 V to +10 V, and a bipolar range of ±5 V with dual supplies. It features a serial interface compatible with microcomputers and DSPs, supporting data rates up to 5 MHz and a DAC update rate of 300 kHz. Key static performance metrics include nonlinearity of ±1/2 LSB typical and power dissipation of 100 mW typical.

Feature Summary

• Integrated 12-bit DACPORT architecture with on-chip Zener voltage reference and buffered output amplifier.
• Three selectable output voltage ranges: 0 V to +5 V, 0 V to +10 V, and ±5 V (bipolar).
• Serial interface supporting daisy-chaining via SDO output and simultaneous multi-DAC updates via LDAC.
• CLR function resets output to 0 V (or –REFIN in offset binary mode) for known power-on states.

Applications

• Process control systems requiring precise analog signal generation.
• Industrial automation equipment utilizing serial communication protocols.
• Digital signal processing systems interfacing with DSP processors.
• Microprocessor input/output ports for analog actuation.

Procurement Notes

Verify the specific grade suffix (A, B, or S) against temperature requirements, as the base model number does not indicate operating range. Confirm package type (DIP or SOIC) matches the PCB footprint. Ensure supply voltages align with the selected output range, particularly noting that the 0 V to +10 V unipolar range requires VDD ≥ +14.25 V. Check RoHS compliance status if required by local regulations.

Selection Notes

Select the AD7243AR when a complete 12-bit solution with integrated reference and amplifier is needed to minimize board space. Choose this component over discrete solutions for improved reliability and reduced calibration complexity. Consider the LC2MOS process for mixed-signal compatibility. Verify that the 300 kHz update rate meets system timing constraints and that the serial interface protocol matches the host controller's capabilities.

Part Context

The AD7243 belongs to Analog Devices' DACPORT family, designed for high integration in data conversion applications. It utilizes LC2MOS technology, combining linear and CMOS processes for optimal performance. The device is part of a broader portfolio including variants like the AD7243BNZ, differing primarily in package and temperature grade. It serves as a bridge between digital control systems and analog actuators in industrial environments.

Replacement Considerations

Direct pin-compatible replacements within the same family include other AD7243 grades (e.g., AD7243BSZ for extended temperature). Cross-family replacements require verification of pinout, resolution, and interface compatibility. No direct substitutes from other manufacturers are confirmed in public documentation without extensive redesign.