AD7243BQ

Overview

The AD7243BQ is a 12-bit voltage output digital-to-analog converter featuring an on-chip Zener voltage reference and a buffered output amplifier. Fabricated using 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 3-wire serial interface compatible with microcomputers and DSPs, supporting data rates up to 5 MHz for a 300 kHz DAC update rate. It includes a daisy-chain capability via the SDO pin and a CLR function for power-on reset. Typical power dissipation is 100 mW.

Feature Summary

• 12-bit resolution with ±1/2 LSB maximum nonlinearity over temperature
• Integrated 5 V reference and buffered output amplifier capable of driving 2 kΩ loads
• Three selectable output voltage ranges: 0–5 V, 0–10 V, and ±5 V
• Serial interface with daisy-chain support and 300 kHz update rate

Applications

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

Procurement Notes

Verify the specific suffix 'BQ' against the manufacturer's official documentation to confirm package type and temperature grade. Standard datasheets typically list DIP and SOIC packages for the AD7243 series. Ensure the ordering information matches the required industrial temperature range of -40°C to +85°C.

Selection Notes

Select this component when a monolithic 12-bit DAC with integrated reference and amplifier is required. It is suitable for applications needing minimal external components. Verify that the system power supply allows for the necessary headroom, particularly for the 0 V to +10 V range which requires VDD ≥ +14.25 V.

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 buffer on a single CMOS chip to reduce board space and improve reliability compared to multi-chip solutions. The BQ designation likely indicates a specific package or qualification variant within the broader AD7243 product line.

Replacement Considerations

Check for direct pin-compatible substitutes such as the AD7243ARZ or other grades (A, S) within the same family. Ensure any replacement maintains the 12-bit resolution, serial interface compatibility, and required output voltage ranges.