AD7248AAR

Overview

The AD7248AAR is a monolithic 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 single CMOS chip. The device features a parallel loading structure with an 8-bit-wide data bus, utilizing double-buffered interface logic for microprocessor compatibility. It operates from supply voltages ranging from +10.8 V to +16.5 V. Key performance specifications include a settling time of 7 µs to within ±1/2 LSB, a relative accuracy of ±3/4 LSB at 25°C, and a differential nonlinearity of ±1 LSB max. The component is housed in a 20-lead SOIC package.

Feature Summary

• Integrated 12-bit DAC with buffered voltage output and internal 5V reference
• 8+4 bit parallel interface structure with double-buffered input latches
• Extended temperature range operation from -40°C to +85°C
• Low power consumption with typical IDD of 9 mA at 25°C

Applications

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

Procurement Notes

Verify the specific suffix 'R' corresponds to the SOIC-20 package option as defined in the ordering guide. Confirm that the A-grade specification meets the required linearity and accuracy tolerances for the target application environment. Ensure supply voltage rails remain within the +10.8 V to +16.5 V operational limits to maintain specified performance parameters.

Selection Notes

Select the AD7248AAR when an 8-bit wide data bus interface is preferred over a 12-bit parallel bus, necessitating two write cycles for full data loading. This model is suitable for designs requiring a single-chip solution with integrated buffering and reference, eliminating external components. Consider the 7 µs settling time and ±3/4 LSB accuracy against system bandwidth and precision requirements.

Part Context

The AD7248AAR belongs to the enhanced AD7245A/AD7248A series, which improves upon the industry-standard AD7245/AD7248 models. Enhancements include operation from 12 V to 15 V supplies, faster interface times with a typical 30 ns data setup time, and improved linearity grades. The device utilizes LC2MOS technology, combining precision bipolar circuits with low-power CMOS logic.

Replacement Considerations

The AD7245AAR is a functionally similar single-channel variant with a 12-bit parallel interface instead of the 8+4 structure. The AD7248ABR offers higher accuracy with ±1/2 LSB relative accuracy compared to the ±3/4 LSB of the A-grade version.