AD7248AARZ

Overview

The AD7248AARZ is a monolithic 12-bit digital-to-analog converter (DAC) from Analog Devices, featuring an integrated output amplifier and a buried Zener voltage reference. It utilizes a parallel interface with an (8+4) bit loading structure, allowing data input via an 8-bit bus in two write operations. The device operates on single or dual supplies ranging from +10.8 V to +16.5 V for VDD and 0 V to -16.5 V for VSS. Key electrical specifications include a typical settling time of 7 µs to within ±1/2 LSB, a relative accuracy of ±1/2 LSB for the AB grade, and a maximum differential nonlinearity of ±1 LSB. The component is housed in a 20-lead SOIC package.

Feature Summary

• Integrated 12-bit DACPORT architecture with on-chip buffered Zener reference and output amplifier
• (8+4) Parallel loading structure compatible with 8-bit microprocessor data buses
• Extended supply range operation from 12 V to 15 V with ±1/2 LSB linearity grade
• Double-buffered interface logic with asynchronous LDAC signal for glitch-free updates

Applications

• Industrial process control systems requiring precise analog signal generation
• Portable instrumentation utilizing single-supply operation
• Data acquisition systems interfacing with standard microprocessors
• Calibration equipment needing stable voltage references

Procurement Notes

Verify the ordering suffix 'R' corresponds to the SOIC-20 package option as defined in the manufacturer's ordering guide. Confirm that the specific temperature grade matches the required operational range of -40°C to +85°C. Ensure the selected variant meets the ±1/2 LSB relative accuracy specification if high precision is required for the application design.

Selection Notes

Select the AD7248AARZ when an 8-bit wide parallel interface is preferred over the 12-bit direct load of the AD7245A. This model is suitable for applications requiring dual-supply bipolar outputs (-5 V to +5 V) or single-supply unipolar ranges (0 V to 5 V or 0 V to 10 V). Consider the 7 µs settling time and 30 ns data setup time for timing constraints in high-speed microprocessor systems.

Part Context

The AD7248AARZ belongs to the AD7245A/AD7248A family, which are enhanced versions of the industry-standard AD7245/AD7248. These devices offer improved interface speeds, extended temperature ranges, and better full-scale variation with supply voltage changes compared to their predecessors. The family is fabricated using linear compatible CMOS (LC2MOS) technology.

Replacement Considerations

The AD7245A series serves as a functional alternative but requires a 12-bit parallel interface rather than the 8-bit (8+4) structure of the AD7248A. Direct pin-for-pin substitution is not possible due to the different pin configurations and loading structures between the two models.