AD7248AAN

Overview

The AD7248AAN is a monolithic 12-bit voltage output digital-to-analog converter from Analog Devices, featuring an integrated output amplifier and a buried Zener voltage reference. It utilizes LC2MOS technology for precision bipolar circuits combined with low-power CMOS logic. The device employs an (8+4) parallel loading structure, accepting data via an 8-bit bus in two write operations controlled by CSMSB, CSLSB, and WR signals. Key specifications include a typical settling time of 7 µs to within ±1/2 LSB, a relative accuracy of ±3/4 LSB at 25°C, and operation over an extended temperature range of –40°C to +85°C. It supports single or dual supply voltages ranging from 10.8 V to 16.5 V.

Feature Summary

• 12-bit resolution with ±3/4 LSB relative accuracy grade and guaranteed monotonicity.
• (8+4) Parallel loading interface structure optimized for microprocessors with 8-bit data buses.
• Integrated 5 V buried Zener reference and buffered output amplifier capable of driving 2 kΩ loads.
• Extended industrial temperature range operation from –40°C to +85°C.

Applications

• Industrial process control systems requiring precise analog signal generation.
• Microprocessor-based instrumentation and data acquisition systems.
• Programmable power supplies and waveform generators.

Procurement Notes

Verify the specific suffix 'AN' corresponds to the Plastic DIP-20 package and the –40°C to +85°C temperature range as defined in the Analog Devices ordering guide. Confirm that the required linearity grade matches the ±3/4 LSB specification associated with this variant rather than the higher precision ±1/2 LSB grade available in other suffixes.

Selection Notes

Select the AD7248AAN when interfacing with 8-bit wide microprocessor buses, as its (8+4) loading structure simplifies connection compared to the 12-bit parallel AD7245A. Ensure the application requires the ±3/4 LSB accuracy grade; if tighter linearity is needed, consider the AB suffix variant. Verify that the system power supply falls within the 10.8 V to 16.5 V range for specified performance.

Part Context

The AD7248AAN belongs to the AD7245A/AD7248A family, which are enhanced versions of the industry-standard AD7245/AD7248 DACPORTs. This family improves upon previous generations with faster interface times, extended temperature ranges, and operation from 12 V to 15 V supplies. The AD7248A specifically distinguishes itself from the AD7245A through its 8-bit data bus interface architecture.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material.