AD7248ABNZ

Overview

The AD7248ABNZ is a monolithic 12-bit voltage output digital-to-analog converter (DAC) from Analog Devices, featuring an integrated output amplifier and a buried Zener voltage reference. It utilizes the DACPORT architecture with an (8+4) parallel loading structure, allowing data input via an 8-bit bus in two write operations. The device operates on dual supplies ranging from ±10.8 V to ±16.5 V or single supply configurations. Key electrical specifications include a settling time of 7 µs to within ±1/2 LSB, a relative accuracy of ±1/2 LSB for the B grade, and a differential nonlinearity of ±1 LSB. It supports unipolar (0 V to 5 V, 0 V to 10 V) and bipolar (±5 V) output ranges.

Feature Summary

• Integrated 12-bit DAC with buffered voltage output and internal 5 V reference.
• (8+4) Parallel interface structure designed for microprocessors with 8-bit data buses.
• Extended temperature range operation from -40°C to +85°C.
• High-speed interface with typical 30 ns data setup time.

Applications

• Industrial process control systems requiring precise analog signal generation.
• Portable instrumentation utilizing single-supply operation capabilities.
• Data acquisition systems interfacing with 8-bit microcontrollers.

Procurement Notes

Verify the specific grade suffix 'B' corresponds to the ±1/2 LSB linearity requirement, as the 'A' grade offers ±3/4 LSB. Confirm package availability in PDIP-20 format. Check current distribution channels for stock status, as lead times may vary due to manufacturing transfers or component lifecycle stages. Ensure RoHS compliance documentation matches the specific revision.

Selection Notes

Select the AD7248ABNZ when an 8-bit wide data bus interface is preferred over a full 12-bit parallel port. Choose this model over the AD7245A if double-buffered byte loading simplifies the system timing. Verify that the required output swing fits within the supported ranges of 0–5 V, 0–10 V, or ±5 V. Consider the power supply constraints, as the device requires up to ±16.5 V for optimal performance but can operate on lower voltages with reduced output swing.

Part Context

The AD7248ABNZ belongs to the AD7245A/AD7248A family, which are enhanced versions of the industry-standard AD7245/AD7248. This series improves upon previous generations by offering operation from 12 V to 15 V supplies, faster interface times, and better full-scale variation with supply voltage changes. The 'B' designation indicates a tighter linearity grade compared to the standard 'A' version.

Replacement Considerations

The AD7248JNZ is a pin-compatible alternative within the same family, though it typically features different electrical specifications such as ±1 LSB INL/DNL and a commercial temperature range (0°C to 70°C). Verify that the looser linearity and narrower temperature range of the JNZ variant meet the application requirements before substitution.