AD7245AAR

Overview

The AD7245AAR is a 12-bit CMOS digital-to-analog converter (DAC) from the DACPORT family, manufactured by Analog Devices Inc. It integrates an 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 both analog and digital rails. It features a parallel data interface with a typical settling time of 7 µs to within ±1/2 LSB. The relative accuracy is specified at ±3/4 LSB maximum over the commercial temperature range of –40°C to +85°C. The component is housed in a 24-lead SOIC package.

Feature Summary

• 12-bit resolution with ±3/4 LSB relative accuracy grade
• Integrated 5 V buried Zener reference and buffered output amplifier
• Parallel loading structure with asynchronous LDAC and CLR signals
• Extended plastic temperature range operation from –40°C to +85°C

Applications

• Microprocessor-compatible data acquisition systems
• Industrial process control loops requiring single-chip DAC solutions
• Calibration equipment utilizing internal reference stability

Procurement Notes

Verify the specific ordering suffix 'R' corresponds to the 24-lead SOIC package option as defined in the manufacturer's ordering guide. Confirm that the 'A' designation aligns with the required ±3/4 LSB accuracy grade and commercial temperature range specifications before procurement.

Selection Notes

Select this model for applications requiring a complete 12-bit DAC solution without external trimming. Ensure the system supports the required 12-bit parallel interface timing, specifically the 30 ns typical data setup time. Verify power supply constraints fit within the +10.8 V to +16.5 V operating range for optimal performance.

Part Context

The AD7245AAR belongs to 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 improved linearity grades. This specific part represents the single-channel variant with an 8+4 bit parallel loading structure.

Replacement Considerations

The AD7245ABR serves as a higher accuracy alternative within the same package offering ±1/2 LSB relative accuracy. For dual-channel requirements, the AD7247 series provides a similar architecture with two converters.