AD7248ABN

Overview

The AD7248ABN is a monolithic 12-bit digital-to-analog converter (DAC) from Analog Devices, part of the DACPORT family. It integrates a voltage output amplifier and a buried Zener voltage reference on a single CMOS chip. The device features an 8-bit-wide parallel data bus with a double-buffered interface logic structure, loading data in two write operations via CSMSB and CSLSB signals. It operates on dual supplies ranging from ±10.8 V to ±16.5 V or single supply configurations. Key performance metrics include a settling time of 7 µs to within ±1/2 LSB, relative accuracy of ±1/2 LSB for the AB grade, and low power consumption of typically 65 mW in single-supply mode.

Feature Summary

• Integrated 12-bit DAC with buffered voltage output and internal 5 V buried Zener reference
• Double-buffered parallel interface supporting 8-bit data bus with separate MSB and LSB control
• Extended temperature range operation from -40°C to +85°C
• High linearity grade with ±1/2 LSB relative accuracy specification

Applications

• Microprocessor-controlled analog signal generation
• Programmable voltage sources requiring high precision
• Industrial process control systems
• Test and measurement equipment

Procurement Notes

Verify the specific ordering suffix 'N' corresponds to the Plastic DIP-20 package as defined in the official Analog Devices ordering guide. Confirm that the 'AB' designation aligns with the required ±1/2 LSB linearity grade and commercial temperature range (-40°C to +85°C). Ensure supply voltages match the specified ±10.8 V to ±16.5 V range for optimal performance.

Selection Notes

Select the AD7248ABN when an 8-bit microprocessor interface is preferred over a full 12-bit parallel bus, utilizing its double-buffered architecture. Choose this model over the AD7245A if space savings from the 20-pin package are critical compared to the 24-pin alternative. Ensure the application requires the specific ±1/2 LSB accuracy grade; otherwise, the standard ±3/4 LSB grade may suffice.

Part Context

The AD7248ABN belongs to the enhanced AD7245A/AD7248A series, which improves upon the industry-standard AD7245/AD7248. 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.

Replacement Considerations

The AD7248AN serves as a direct functional replacement with slightly lower linearity accuracy (±3/4 LSB). For applications requiring extended temperature ranges up to +125°C, the AD7248ATQ is available but requires MIL-STD-883 processing.