AD7248JN

Overview

The AD7248JN is a monolithic 12-bit voltage output digital-to-analog converter from the DACPORT family, manufactured by Analog Devices. It integrates an output amplifier and a buried Zener voltage reference on a single CMOS chip. The device features an 8-bit-wide data bus with a double-buffered (8+4) parallel loading structure, allowing data transfer in two write operations. It operates from dual supplies ranging from ±10.8 V to ±16.5 V or a single supply of +12 V to +15 V. Key performance metrics include a settling time of 10 µs max, relative accuracy of ±1/2 LSB for the AB grade, and low power consumption of 65 mW typical in single-supply mode.

Feature Summary

• Integrated 12-bit DAC with buffered voltage output and internal 5 V reference
• (8+4) Double-buffered parallel interface compatible with 8-bit microprocessor buses
• Extended temperature range operation from –40°C to +85°C
• Single or dual supply operation with ±1/2 LSB linearity grade

Applications

• Industrial process control systems requiring precise analog signal generation
• Portable instrumentation benefiting from low power consumption
• Microprocessor-based data acquisition systems needing direct parallel interfacing
• Battery-powered equipment utilizing single-supply operation

Procurement Notes

Verify the specific suffix 'JN' against the manufacturer's ordering guide to confirm the package type (Plastic DIP) and temperature range (–40°C to +85°C). Ensure the required accuracy grade matches the available options, as the datasheet specifies distinct grades such as ABN for ±1/2 LSB. Confirm availability status directly with authorized distributors, as lead times may vary.

Selection Notes

Select the AD7248JN when an 8-bit microprocessor interface is preferred over a full 12-bit parallel bus. Choose this model over the AD7245A if the system design requires byte-wise data loading rather than simultaneous 12-bit input. Verify that the application can accommodate the required supply voltages of ±10.8 V to ±16.5 V for specified performance. Consider the 20-lead PDIP package constraints for PCB layout.

Part Context

The AD7248A series represents an enhanced version of the industry-standard AD7248, offering improved interface speeds and extended temperature ranges. It belongs to the DACPORT family, which combines precision bipolar circuits with low-power CMOS logic. The AD7248 variant specifically targets applications where microprocessors have limited data bus width, simplifying interface logic compared to the 12-bit wide AD7245.

Replacement Considerations

The AD7245A is a functional alternative but requires a 12-bit parallel interface instead of the 8-bit (8+4) structure. For surface mount requirements, the AD7248AR (SOIC) offers the same electrical characteristics in a different package. Legacy versions like the AD7248 without the 'A' suffix lack the extended temperature range and improved linearity specifications.