AD7248AAPZ-REEL

Overview

The AD7248AAPZ-REEL 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. Key specifications include a settling time of 7 µs to within ±1/2 LSB, relative accuracy grades of ±3/4 LSB or ±1/2 LSB, and operation from dual supplies ranging from ±10.8 V to ±16.5 V. The component is housed in a 20-lead Plastic Leaded Chip Carrier (PLCC) package.

Feature Summary

• Integrated 12-bit DAC with internal 5 V buried Zener reference and buffered output amplifier
• Parallel interface with 8-bit data bus and double-buffered input/DAC latches
• High-speed interface with typical 30 ns data setup time
• Extended temperature range operation from -40°C to +85°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 linearity grade (A or B) required for the application, as the base model number does not specify the accuracy tier. Confirm that the PLCC-20 surface mount package aligns with the PCB footprint design. Ensure power supply decoupling components match the datasheet recommendations for the REF OUT pin to maintain specified noise performance.

Selection Notes

Select this component when an 8-bit wide parallel interface is preferred over the 12-bit direct load of the AD7245A. Choose the AD7248AB variant if ±1/2 LSB linearity is critical; otherwise, the AD7248AA variant offers ±3/4 LSB accuracy. Verify that the system can accommodate the required ±10.8 V to ±16.5 V supply rails, as single-supply operation is limited compared to newer devices.

Part Context

This part is an enhanced version of the industry-standard AD7248, featuring improved linearity grades, faster interface times, and extended temperature ranges. It belongs to the DACPORT series, which combines precision bipolar circuits with low-power CMOS logic. The 'P' suffix indicates the Plastic Leaded Chip Carrier package, while 'REEL' denotes tape-and-reel packaging for automated assembly.

Replacement Considerations

The AD7245A is a functional alternative but requires a 12-bit parallel interface rather than an 8-bit bus. For surface-mount applications requiring similar performance, verify pinout compatibility between the PLCC-20 and other packages like SOIC-20 or DIP-20 before substitution.