AD7248AANZ

Overview

The AD7248AANZ is a monolithic 12-bit voltage output digital-to-analog converter featuring an integrated output amplifier and buried Zener reference. It utilizes LC2MOS technology for precision bipolar circuits combined with low-power CMOS logic. The device accepts 12-bit data via an 8-bit parallel bus loaded in two write operations, controlled by CSMSB, CSLSB, and WR signals. An asynchronous LDAC signal updates the analog output. It operates from single or dual supplies (+12 V to +15 V) and supports output ranges of 0–5 V, 0–10 V, or ±5 V. Key specifications include ±1/2 LSB relative accuracy, 30 ns typical data setup time, and 65 mW typical power dissipation in single-supply mode.

Feature Summary

• 12-bit resolution with ±1/2 LSB relative accuracy grade
• Integrated 5 V buried Zener reference and output amplifier
• 8-bit parallel interface with double-buffered input latch
• Single or dual supply operation (VDD: +12 V to +15 V)
• Programmable output ranges: 0–5 V, 0–10 V, or ±5 V

Applications

• Industrial process control systems
• Portable instrumentation
• Battery-powered equipment
• Microprocessor-based data acquisition

Procurement Notes

Verify the ordering suffix 'ANZ' corresponds to the Plastic DIP-20 package with RoHS compliance as per the manufacturer's current catalog. Confirm the temperature range is –40 °C to +85 °C. Ensure the specific linearity grade matches system requirements, as the 'A' suffix denotes ±3/4 LSB while 'B' denotes ±1/2 LSB.

Selection Notes

Select the AD7248A over the AD7245A when interfacing with microprocessors having an 8-bit wide data bus, as it requires two write cycles for full 12-bit loading. Choose the 'A' version for standard commercial applications requiring ±3/4 LSB accuracy, or the 'B' version for higher precision needs at ±1/2 LSB. Ensure supply voltages remain within +12 V to +15 V for specified performance.

Part Context

The AD7248A is part of the enhanced AD7245A/AD7248A family, improving upon the legacy AD7245/AD7248 models. It offers faster interface times, extended temperature ranges, and better full-scale variation with supply voltage changes. The AD7248A variant specifically targets systems using 8-bit data buses, whereas the AD7245A supports direct 12-bit parallel loading.

Replacement Considerations

The AD7248ABN is a pin-compatible alternative with improved ±1/2 LSB linearity accuracy. For military specifications, the AD7248ATQ processed to MIL-STD-883 Class B is available. Direct replacement with non-enhanced AD7248 parts may require verification of interface timing and supply voltage compatibility.