AD7245AAQ

Overview

The AD7245AAQ is a monolithic 12-bit voltage-output digital-to-analog converter from the DACPORT family, manufactured by Analog Devices. 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. It features a parallel data interface with double-buffered logic, settling times of up to 10 µs, and relative accuracy grades of ±3/4 LSB or ±1/2 LSB. The component is housed in a 24-lead Cerdip (CDIP) package and supports unipolar (0–5 V, 0–10 V) and bipolar (±5 V) output ranges.

Feature Summary

• Integrated 12-bit R-2R DAC with buffered voltage output and internal 5 V reference
• Parallel interface with double-buffered input and DAC latches for microprocessor compatibility
• Extended temperature range operation from -40°C to +85°C
• Low power consumption with typical IDD of 9 mA at 25°C

Applications

• Industrial process control systems requiring precise analog signal generation
• Programmable power supplies and battery testers
• Data acquisition systems with high-speed update requirements
• Calibration equipment needing stable voltage references

Procurement Notes

Verify current availability status as distribution channels may report limited stock or discontinuation. Confirm RoHS compliance and specific linearity grade (A vs B) required for the application. Check for military-grade /883B processing options if environmental ruggedness is mandated. Ensure proper ESD handling procedures are followed during assembly due to CMOS sensitivity.

Selection Notes

Select the AD7245AAQ when a 12-bit resolution with integrated reference and amplifier is needed in a through-hole ceramic package. Compare settling time specifications against system update rate requirements. Consider the AD7248A variant if an 8-bit wide data bus interface is preferred over the 12-bit parallel structure. Verify power supply constraints align with the 10.8 V to 16.5 V operating range.

Part Context

The AD7245AAQ belongs to the enhanced AD7245A/AD7248A series, which improves upon the original industry-standard parts with faster interface times and extended temperature capabilities. It is part of the broader DACPORT family designed for space-saving and reliability in mixed-signal applications. The 'Q' suffix denotes the 24-lead Cerdip package option within the Analog Devices product lineup.

Replacement Considerations

Direct pin-compatible replacements include other variants in the AD7245A family such as AD7245AAP (PLCC), AD7245AAR (SOIC), or AD7245ABN (Plastic DIP). For 8-bit bus interfaces, the AD7248A series offers similar performance with different loading structures. Verify that any substitute maintains the required linearity grade and package thermal characteristics.