AD7248ABRZ-REEL

Overview

The AD7248ABRZ-REEL is a 12-bit voltage output digital-to-analog converter (DAC) from Analog Devices, part of the DACPORT family. It integrates an output amplifier and a buried Zener voltage reference on a monolithic CMOS chip. The device features an 8-bit data bus with an (8+4) loading structure, allowing data to be loaded into the input latch in two write operations. It operates on single or dual supplies ranging from 10.8 V to 16.5 V. Key specifications include a typical settling time of 7 µs, ±1/2 LSB relative accuracy for the B grade, and a parallel interface compatible with microprocessors. The component is housed in a 20-lead SOIC package.

Feature Summary

• 12-bit resolution with ±1/2 LSB relative accuracy (B Grade)
• Integrated 5 V buried Zener reference and buffered output amplifier
• (8+4) parallel loading structure for 8-bit microprocessor buses
• Single supply operation (10.8 V to 16.5 V) with unipolar/bipolar ranges

Applications

• Microprocessor-controlled analog signal generation
• Industrial process control systems requiring high linearity
• Portable instrumentation with single-supply constraints
• Data acquisition systems needing integrated reference solutions

Procurement Notes

Verify the 'BRZ' suffix indicates the SOIC-20 surface mount package and RoHS compliance. Confirm the '-REEL' designation corresponds to tape-and-reel packaging for automated assembly. Ensure the 'A' in the base model denotes the extended temperature range of -40°C to +85°C. Cross-reference the specific lot date code if long-term storage stability is a critical factor for the application timeline.

Selection Notes

Select the AD7248ABRZ-REEL over the AD7245A variant when interfacing with 8-bit wide data buses, as it utilizes an (8+4) loading structure rather than a full 12-bit parallel load. Choose this B-grade version for applications requiring tighter linearity specifications (±1/2 LSB) compared to the A-grade (±3/4 LSB). Ensure the system power supply remains within the 10.8 V to 16.5 V range to maintain specified performance metrics.

Part Context

This component belongs to the enhanced AD7245A/AD7248A series, which improves upon the legacy AD7245/AD7248 models. Enhancements include operation from 12 V to 15 V supplies, faster interface times with 30 ns typical data setup time, and improved full-scale variations with respect to VDD. The device is fabricated using linear compatible CMOS (LC2MOS) technology, combining precision bipolar circuits with low-power CMOS logic.

Replacement Considerations

The AD7245A is a functional equivalent but requires a 12-bit parallel interface. For lower resolution needs, the AD7228 (8-bit) may be considered, though pinouts and interfaces differ. Verify that any substitute maintains the required 12-bit resolution and integrated reference capabilities.