AD7247ABR-REEL

Overview

The AD7247ABR-REEL is a dual 12-bit voltage-output digital-to-analog converter (DAC) from the DACPORT family, manufactured by Analog Devices Inc. It integrates two independent 12-bit CMOS DACs with on-chip output amplifiers and a Zener voltage reference on a single monolithic LC2MOS chip. The device features a parallel loading structure accepting 12-bit data via separate Chip Select inputs for each DAC and a common Write input. It supports single or dual supply operation within a voltage range of +10.8 V to +16.5 V for VDD and -10.8 V to -16.5 V for VSS. The part is housed in a 24-lead Small Outline Integrated Circuit (SOIC) package.

Feature Summary

• Dual 12-bit resolution with R-2R architecture and buffered voltage outputs
• On-chip 5 V temperature-compensated buried Zener reference with REF OUT/REF IN capability
• Parallel interface with individual Chip Select (CSA/CSB) and common Write (WR) inputs
• Settling time of 8 µs max (typical 5 µs) to within ±1/2 LSB

Applications

• Interfacing with 8-bit or 16-bit microprocessors such as Intel 8086 and Motorola 68000
• DSP systems including Analog Devices ADSP-2101
• Multi-channel data acquisition systems requiring simultaneous or independent channel updates

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and moisture sensitivity level prior to soldering. Check for obsolescence notices or discontinuance alerts as this specific REEL variant may have limited availability compared to tube-packaged equivalents.

Selection Notes

Select the AD7247ABR-REEL when a parallel interface with independent channel selection is required. Ensure power supplies fall within the specified ±10.8 V to ±16.5 V range for optimal performance. Consider the SOIC-24 package constraints for thermal management and PCB layout. Verify that the 12-bit accuracy meets system requirements relative to the ±1 LSB relative accuracy specification.

Part Context

This component belongs to the AD7237A/AD7247A series, which are enhanced versions of the industry-standard AD7237/AD7247. The 'ABR' designation indicates the B-grade accuracy (±1/2 LSB max), the R suffix denotes the SOIC package, and '-REEL' specifies tape and reel packaging. It shares functional similarities with the AD7237A but differs in its parallel data loading structure versus the double-buffered 8-bit bus interface of the AD7237A.

Replacement Considerations

Direct substitutes include the AD7247ABRZ-REEL for RoHS-compliant versions. For non-reel packaging, consider the AD7247ABR tube variant. The AD7245 series offers similar performance with slight variations in settling time and accuracy.