AD7248JP

Overview

The AD7248JP is a 12-bit DACPORT digital-to-analog converter featuring an integrated output amplifier and buried Zener voltage reference. It utilizes an (8+4) parallel loading structure, accepting data via an 8-bit bus in two write operations controlled by CSMSB, CSLSB, and WR signals. The device operates on single or dual supplies ranging from +10.8 V to +16.5 V for VDD and -10.8 V to -16.5 V for VSS. Key performance metrics include a typical settling time of 7 µs, ±1/2 LSB relative accuracy for the AB grade, and low power consumption of 65 mW typ in single supply mode. It is available in a 20-lead Plastic DIP package.

Feature Summary

• 12-bit resolution with ±1/2 LSB linearity grade (AB version)
• (8+4) parallel interface structure for microprocessor compatibility
• Integrated 5 V buried Zener reference and buffered output amplifier
• Single or dual supply operation (+10.8 V to +16.5 V / -10.8 V to -16.5 V)

Applications

• Industrial process control systems requiring precise analog output
• Microprocessor-based instrumentation with direct parallel interfacing
• Battery-powered equipment utilizing single-supply configurations

Procurement Notes

Verify the specific suffix indicates the correct temperature range and accuracy grade. The 'JP' designation typically corresponds to the Plastic Leaded Chip Carrier (PLCC) or similar surface mount variant depending on the manufacturer's specific coding, whereas 'JNZ' denotes PDIP. Confirm package type against schematic footprints. Check for military processing requirements if '/883B' is needed. Ensure supply voltage tolerances match the ±10% specification for guaranteed performance.

Selection Notes

Select the AD7248A over AD7245A when interfacing with 8-bit wide microprocessor buses due to its (8+4) loading structure. Choose the AB grade for applications requiring ±1/2 LSB linearity instead of the standard A grade. Ensure the design supports the required 12 V to 15 V supply rails. Consider the PLCC package if surface mount assembly is preferred over through-hole DIP options.

Part Context

The AD7248A is part of the enhanced DACPORT family, succeeding the industry-standard AD7248. It offers improved interface speeds, extended temperature ranges, and better full-scale variation with supply voltage changes. The device combines precision bipolar circuits with low-power CMOS logic using the LC2MOS process, providing a monolithic solution that eliminates external trims.

Replacement Considerations

The MX7248JP is a pin-compatible alternative from Maxim Integrated offering similar 12-bit performance. Verify supply voltage compatibility as the MX7248 may have different operating ranges. Interface timing parameters should be compared to ensure microprocessor compatibility.