AD7245ABRZ-REEL

Overview

The AD7245ABRZ-REEL is a 12-bit voltage output digital-to-analog converter (DAC) from Analog Devices, packaged in a 24-lead SOIC. It integrates an output amplifier and a buried Zener voltage reference on a single CMOS chip. The device operates with supply voltages ranging from +10.8 V to +16.5 V for VDD and -10.8 V to -16.5 V for VSS. Key electrical specifications include a maximum relative accuracy of ±1/2 LSB at 25°C and ±3/4 LSB over the full temperature range (-40°C to +85°C). The DAC features a parallel data interface with a typical settling time of 7 µs to within ±1/2 LSB.

Feature Summary

• 12-bit resolution with R-2R architecture and integrated buffered output amplifier
• On-chip 5 V buried Zener reference requiring no external user trims
• Parallel loading structure with double-buffered interface logic
• Extended plastic temperature range operation from -40°C to +85°C

Applications

• Microprocessor-compatible signal generation systems
• Industrial process control loops requiring precise voltage outputs
• Test and measurement equipment needing low glitch impulse

Procurement Notes

Verify the specific linearity grade (A or B) required for the application, as the base part number may denote different accuracy levels. Confirm that the REEL suffix indicates tape-and-reel packaging suitable for automated assembly processes. Ensure power supply decoupling components match the datasheet recommendations for the REF OUT pin to maintain specified noise performance.

Selection Notes

Select this component when a monolithic solution combining DAC, amplifier, and reference is needed to save board space. Choose the AB variant if ±1/2 LSB linearity is required; otherwise, the AA variant offers ±3/4 LSB accuracy. Consider the parallel interface requirements against available microprocessor data bus widths, noting that the AD7248A variant supports an 8-bit bus structure if pin count reduction is necessary.

Part Context

This device belongs to the DACPORT family, which are industry-standard 12-bit converters. The AD7245A is the enhanced version featuring improved interface times and wider supply voltage operation compared to earlier generations. It is designed to replace older multichip designs by integrating all necessary functions onto a single LC2MOS chip.

Replacement Considerations

The AD7248A is a compatible alternative with an 8-bit wide data bus interface. For military specifications, parts processed to MIL-STD-883 Class B are available by adding /883B to the part number.