AD7245ABN

Overview

The AD7245ABN is a monolithic 12-bit CMOS digital-to-analog converter (DAC) from the DACPORT family, manufactured by Analog Devices Inc. It integrates a voltage output amplifier and a buried Zener voltage reference on a single chip, eliminating the need for external user trims. The device operates from supply voltages ranging from +10.8 V to +16.5 V for VDD and -10.8 V to -16.5 V for VSS. It features a parallel data interface with an 8+4 bit loading structure, double-buffered logic, and a typical settling time of 7 µs. The AD7245ABN offers improved linearity of ±1/2 LSB max and supports extended temperature operation from –40°C to +85°C in a 24-lead plastic DIP package.

Feature Summary

• 12-Bit Resolution: Provides high precision with a relative accuracy grade of ±1/2 LSB maximum at 25°C.
• Integrated Reference and Amplifier: Includes an on-chip 5 V buried Zener reference and a buffered output amplifier capable of driving 10 V across a 2 kΩ load.
• Fast Parallel Interface: Features a 30 ns typical data setup time and double-buffered input/DAC latches for microprocessor compatibility.
• Extended Temperature Range: Commercial and industrial grades support operation from –40°C to +85°C.

Applications

• Industrial process control systems requiring precise analog signal generation.
• Test and measurement equipment needing stable, low-noise voltage outputs.
• Microprocessor-based instrumentation interfaces.
• Programmable power supplies and waveform generators.

Procurement Notes

Verify the specific ordering suffix 'N' corresponds to the 24-lead Plastic DIP package when sourcing. Confirm that the 'B' suffix indicates the ±1/2 LSB linearity grade, which differs from the standard 'A' grade. Ensure supply voltage requirements align with the specified range of +10.8 V to +16.5 V for proper functionality. Check for RoHS compliance status if required by local regulations, as older revisions may vary.

Selection Notes

Select the AD7245ABN over the AD7245AAQ or AD7245AAN based on the required linearity specification; the 'B' grade ensures tighter accuracy than the 'A' grade. Consider the package type, as the 'N' suffix denotes a through-hole DIP, whereas other suffixes like 'R' indicate surface mount SOIC options. Evaluate power supply constraints, as the device requires dual supplies or a single positive supply with appropriate grounding configurations for unipolar or bipolar output ranges.

Part Context

The AD7245ABN is part of the enhanced AD7245A/AD7248A series, which improves upon the industry-standard AD7245/AD7248. Key enhancements include operation from 12 V to 15 V supplies, faster interface times, and better full-scale variation with VDD. This component represents a mature technology in the DACPORT family, designed for applications where space savings and reliability are prioritized over multichip designs.

Replacement Considerations

Direct replacements within the same family include the AD7245AAQ (±3/4 LSB accuracy, Cerdip package) and AD7245AAN (±3/4 LSB accuracy, Plastic DIP). For surface mount applications, the AD7245ABR (SOIC package) is a pin-compatible alternative with the same ±1/2 LSB accuracy grade. Verify pinout compatibility and thermal characteristics when substituting packages.