AD7243BN

Overview

The AD7243 is a monolithic 12-bit voltage output digital-to-analog converter featuring an on-chip Zener voltage reference and a buffered output amplifier. Fabricated using Linear Compatible CMOS (LC2MOS) technology, it supports single or dual supply operation with selectable output ranges of 0 V to +5 V, 0 V to +10 V, or ±5 V. The device utilizes a versatile serial interface compatible with microcomputers and DSPs, supporting data rates up to 5 MHz for a DAC update rate of 300 kHz. It includes a daisy-chain capability via the SDO pin and a CLR function for power-on reset.

Feature Summary

• 12-bit resolution with R-2R architecture and ±0.5 LSB typical nonlinearity
• Integrated 5 V reference and buffered output amplifier capable of driving 2 kΩ loads
• Serial interface with daisy-chain support and 300 kHz update rate
• Three selectable output ranges: 0–5 V, 0–10 V, and ±5 V

Applications

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

Procurement Notes

Verify the specific grade suffix (A, B, or S) required for the target operating temperature range, as specifications vary between industrial (-40°C to +85°C) and extended (-55°C to +125°C) grades. Confirm package availability in DIP or SOIC formats based on board layout constraints. Ensure power supply decoupling capacitors are placed close to VDD and VSS pins to maintain performance.

Selection Notes

Select the AD7243BN for industrial temperature applications requiring a 16-lead DIP package. For surface mount requirements, consider the AD7243ARZ variant in a 16-lead SOIC package. Verify that the system reference voltage matches the internal 5 V reference or configure REFIN externally if different scaling is needed. Ensure the LDAC pin configuration aligns with the desired update mode, either automatic or manual.

Part Context

The AD7243 belongs to Analog Devices' DACPORT family of complete digital-to-analog converters. This series integrates the DAC core, reference, and output amplifier on a single chip to reduce component count and improve reliability compared to multichip designs. The AD7243 specifically targets applications requiring moderate speed and precision with minimal external circuitry.

Replacement Considerations

The AD7243ARZ serves as a direct pin-compatible replacement in a surface-mount SOIC package. When substituting, verify that the thermal characteristics of the new package meet the application's dissipation requirements.