AD7245AAR-REEL

Overview

The AD7245AAR-REEL is a monolithic 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices, part of the DACPORT family. 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 both analog and digital sections. It features a parallel interface structure accepting 12-bit data, with a typical settling time of 7 µs to within ±1/2 LSB. The component is housed in a 24-lead SOIC package and supports commercial temperature ranges from –40°C to +85°C.

Feature Summary

• Integrated 12-bit R-2R DAC with buffered voltage output and internal 5 V reference
• Parallel data interface with double-buffered logic and asynchronous LDAC update
• Extended linearity grade of ±1/2 LSB max over full temperature range
• Low power consumption with typical 65 mW dissipation in single-supply mode

Applications

• Microprocessor-controlled instrumentation systems
• Industrial process control loops requiring precise voltage generation
• Programmable power supplies and signal generators
• Calibration equipment utilizing internal reference stability

Procurement Notes

Verify the ordering suffix 'R' corresponds to the 24-lead SOIC package and '-REEL' indicates tape-and-reel packaging configuration. Confirm that the specific revision matches the required temperature grade and linearity specifications. Ensure compatibility with existing PCB footprints for surface-mount assembly. Check for any end-of-life notifications or alternative package options if reel quantities are not required.

Selection Notes

Select this model when a complete 12-bit DAC solution with integrated reference and amplifier is required to minimize external components. The AD7245A is suitable for applications needing fast 30 ns data setup times and direct microprocessor interfacing. Consider the AD7248A variant if an 8-bit wide bus interface with two-write-cycle loading is preferred. Ensure supply voltages remain within the specified 10.8 V to 16.5 V range for optimal performance.

Part Context

The AD7245A is an enhanced version of the industry-standard AD7245, offering improved linearity, faster interface speeds, and extended temperature operation. It belongs to the DACPORT series, which combines precision bipolar circuits with low-power CMOS logic. The device replaces older multichip designs by integrating all necessary functions onto a single die, reducing board space and increasing reliability.

Replacement Considerations

The AD7245ABR offers improved ±1/2 LSB linearity compared to the standard ±3/4 LSB grade. For dual-channel requirements, the AD7247 series provides similar functionality with two converters. Verify pinout compatibility when substituting with legacy AD7245 parts, as electrical characteristics may differ slightly.