AD7248AARZ-REEL

Overview

The AD7248AARZ-REEL is a monolithic 12-bit CMOS digital-to-analog converter (DAC) from the DACPORT family, manufactured by Analog Devices. It integrates a voltage output amplifier and a buried Zener voltage reference on a single chip. The device features an 8-bit-wide data bus with a double-buffered interface logic structure, loading data in two write operations via CSMSB and CSLSB signals. It operates on single or dual supplies ranging from 10.8 V to 16.5 V. Key performance metrics include a typical settling time of 7 µs, ±1/2 LSB relative accuracy for the AB grade, and low power consumption of 65 mW typically in single-supply mode. The part is housed in a 20-lead SOIC package.

Feature Summary

• Integrated 12-bit DAC with buffered voltage output and internal 5 V reference
• Double-buffered parallel interface with 8-bit data bus and separate MSB/LSB chip selects
• Extended temperature range operation from -40°C to +85°C
• High-speed interface with typical 30 ns data setup time

Applications

• Microprocessor-controlled analog signal generation
• Industrial process control systems requiring precise voltage outputs
• Test and measurement equipment needing stable reference voltages

Procurement Notes

Verify the specific linearity grade (AB vs A) required for the application, as specifications differ. Confirm that the 20-lead SOIC package matches the PCB footprint. Ensure supply voltages remain within the 10.8 V to 16.5 V range for specified performance. Check for RoHS compliance status if environmental regulations apply to the end product.

Selection Notes

Select the AD7248A over the AD7245A when interfacing with microprocessors that have an 8-bit wide data bus, as it utilizes an (8+4) loading structure. Choose the AB grade version if tighter linearity specifications of ±1/2 LSB are necessary compared to the standard ±3/4 LSB grade. Consider dual supply operation if bipolar output ranges or faster settling near zero volts are required.

Part Context

This component is part of the enhanced AD7245A/AD7248A series, which improves upon the industry-standard AD7245/AD7248. Enhancements include operation from 12 V to 15 V supplies, improved linearity grades, faster interface times, and better full-scale variation with respect to supply voltage changes. It is fabricated using linear compatible CMOS (LC2MOS) technology.

Replacement Considerations

The AD7248AN and AD7248AQ are pin-compatible alternatives in DIP and Cerdip packages respectively. For surface mount applications, the AD7248ABR offers the same functionality in a 20-lead SOIC package with ±1/2 LSB accuracy. Verify package dimensions and pinout compatibility before substitution.