AD7245AARZ-REEL

Overview

The AD7245AARZ-REEL is a 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 monolithic 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. It features a parallel data interface with an 8+4 bit loading structure, accepting 12-bit digital inputs. Key performance specifications include a typical settling time of 7 µs to within ±1/2 LSB, a relative accuracy of ±1/2 LSB (Grade B), and low power consumption of 65 mW in single-supply mode. The component supports unipolar (0 V to 5 V, 0 V to 10 V) and bipolar (±5 V) output ranges.

Feature Summary

• 12-bit resolution with ±1/2 LSB linearity grade and guaranteed monotonicity.
• Integrated on-chip 5 V buried Zener reference and buffered voltage output amplifier.
• Parallel interface with double-buffered logic; 8+4 bit loading structure for microprocessor compatibility.
• Extended temperature range operation from –40 °C to +85 °C.

Applications

• Industrial process control systems requiring precise analog signal generation.
• Portable instrumentation and test equipment.
• Software-defined radio architectures.
• Medical ultrasound equipment signal chains.

Procurement Notes

Verify the ordering suffix 'REEL' indicates tape-and-reel packaging when sourcing this specific part number. Confirm that the 'A' designation corresponds to the commercial temperature range (–40 °C to +85 °C) and the 'B' accuracy grade (±1/2 LSB). Ensure supply voltage rails are maintained within the specified +10.8 V to +16.5 V limits for optimal performance. Check for RoHS compliance status as per the manufacturer's current documentation.

Selection Notes

Select the AD7245AARZ-REEL for applications requiring a complete 12-bit DAC solution without external trimming. Choose this model over the AD7248A if direct 12-bit parallel loading is preferred over the 8-bit dual-write interface. Consider the integrated reference and amplifier for space-constrained designs. Verify that the required output swing (0-5V, 0-10V, or ±5V) matches the available pin-strappable configurations. Ensure the system can accommodate the specified supply voltage range.

Part Context

The AD7245AARZ-REEL belongs to the enhanced AD7245A/AD7248A series, which improves upon the original industry-standard parts. Enhancements include operation from 12 V to 15 V supplies, faster interface times with a typical 30 ns data setup time, and improved full-scale variation with VDD. The 'ARZ' suffix denotes a 24-lead SOIC package in a tape-and-reel format, suitable for automated surface-mount assembly.

Replacement Considerations

The AD7245AAR is the non-lead-free equivalent of the AD7245AARZ-REEL. For pin-compatible alternatives with different interface structures, consider the AD7248A series, which uses an 8-bit wide bus with two write cycles. Direct replacements must maintain the 12-bit resolution and parallel interface requirements.