AD7245ABR

Overview

The AD7245ABR is a 12-bit monolithic digital-to-analog converter (DAC) from the DACPORT family, manufactured by Analog Devices Inc. It integrates a voltage output amplifier and a buried Zener 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 rails. Key performance specifications include a typical settling time of 7 µs to within ±1/2 LSB, a maximum differential nonlinearity (DNL) of ±1 LSB, and an integral nonlinearity (INL) of ±0.75 LSB for the AB grade. It features a parallel interface with double-buffered logic and consumes approximately 9 mA of supply current.

Feature Summary

• Integrated 12-bit R-2R voltage mode DAC with buffered output amplifier and internal 5 V reference.
• Parallel data interface with asynchronous Load DAC (LDAC) and Clear (CLR) inputs.
• Extended linearity grade: ±1/2 LSB relative accuracy at 25°C; ±3/4 LSB over temperature range.
• Operates from single or dual supplies (+10.8 V to +16.5 V); supports 0–5 V, 0–10 V, and ±5 V output ranges.

Applications

• Precision industrial process control systems requiring direct microprocessor interfacing.
• Programmable power supplies and instrumentation amplifiers needing stable voltage references.
• Data acquisition systems utilizing high-speed parallel loading structures.

Procurement Notes

Verify the specific suffix 'BR' corresponds to the SOIC-24 package and commercial temperature range (-40°C to +85°C). Confirm that the 'A' designation in the base model aligns with the required ±3/4 LSB accuracy if the higher precision 'B' grade is not strictly necessary, as pricing and availability may differ between grades. Ensure supply voltage constraints match the +10.8 V to +16.5 V specification.

Selection Notes

Select the AD7245ABR when a 12-bit resolution with ±1/2 LSB linearity at room temperature is required. The part is suitable for applications needing a built-in reference to reduce external component count. Compare against the AD7248A if an 8-bit wide parallel interface is preferred over the 12-bit wide interface of the AD7245A. Ensure the system can accommodate the 7 µs settling time and 9 mA current consumption.

Part Context

The AD7245A is an enhanced version of the industry-standard AD7245, featuring improved interface speeds (30 ns typical data setup time) and operation from 12 V to 15 V supplies. It belongs to the DACPORT series, which combines precision bipolar circuits with low-power CMOS logic. The AB variant specifically denotes the improved linearity grade packaged in a 24-lead Small Outline Integrated Circuit (SOIC).

Replacement Considerations

The AD7245AAQ is a compatible alternative offering ±3/4 LSB accuracy in a Cerdip package. For extended temperature operation (-55°C to +125°C), the AD7245ATE is available but typically requires MIL-STD-883 processing. The AD7248ABR serves as a functional replacement if an 8-bit parallel interface is acceptable instead of the 12-bit parallel interface.