AD7243ARZ

Overview

The AD7243ARZ is a monolithic 12-bit voltage output digital-to-analog converter (DAC) from Analog Devices, fabricated on LC2MOS technology. It integrates an on-chip buried Zener voltage reference and a buffered output amplifier. 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 versatile 3-wire serial interface compatible with microcomputers and DSPs, supporting data rates up to 5 MHz for a 300 kHz DAC update rate. Key specifications include a settling time of 10 µs max, relative accuracy of ±1 LSB max, and low power dissipation of 100 mW typical. The component is housed in a 16-lead SOIC package.

Feature Summary

• Integrated 12-bit DAC with on-chip 5 V voltage reference and buffered output amplifier
• Selectable output voltage ranges: 0 V to +5 V, 0 V to +10 V, or ±5 V
• Serial interface with daisy-chain capability via SDO output
• CLR function for power-on reset to known output state

Applications

• Process control systems
• Industrial automation equipment
• Digital signal processing systems
• Microcontroller input/output ports

Procurement Notes

Verify the specific grade suffix (A, B, or S) against temperature requirements, as the datasheet defines distinct operating ranges for each. Confirm that the REFIN pin is connected to REFOUT if utilizing the internal reference, or to an external source if higher precision is needed. Ensure power supply decoupling capacitors are placed close to VDD and VSS pins to maintain specified performance levels.

Selection Notes

Select the AD7243ARZ when a complete 12-bit solution with integrated reference and amplifier is required in a small 16-lead SOIC package. Choose this part over discrete solutions for improved reliability and reduced board space. Verify that the required output current does not exceed the amplifier's sink capability, particularly near ground potential in single-supply configurations.

Part Context

The AD7243 belongs to the DACPORT family of monolithic DACs. The 'ARZ' designation indicates the A-grade industrial temperature version (-40°C to +85°C) packaged in a 16-lead SOIC tube. Other variants include the B-grade (same temp range) and S-grade (-55°C to +125°C), as well as DIP packaging options.

Replacement Considerations

The AD7243ARZ-REEL is a parameter-equivalent reel-and-seal variant of the same component. No other cross-manufacturer substitutes are documented in the provided source material.