AD7247ABR

Overview

The AD7247ABR is a dual 12-bit voltage-output digital-to-analog converter (DAC) from the DACPORT family, housed in a 24-lead Small Outline Integrated Circuit (SOIC) package. It integrates two independent 12-bit CMOS DACs with on-chip output amplifiers and a Zener voltage reference. The device operates on single or dual supplies ranging from +10.8 V to +16.5 V for VDD and corresponding negative rails. Key electrical specifications include a typical settling time of 8 µs to within ±1/2 LSB, a maximum differential nonlinearity (DNL) of ±0.9 LSB, and a maximum integral nonlinearity (INL) of ±1 LSB. The interface utilizes a parallel loading structure with separate Chip Select inputs for each channel.

Feature Summary

• Dual 12-bit resolution with integrated output buffer amplifiers and internal 5 V reference.
• Parallel data interface with individual Chip Select (CSA/CSB) and common Write (WR) inputs.
• Configurable output ranges: 0 V to +5 V, 0 V to +10 V (unipolar), and ±5 V (bipolar).
• Typical settling time of 8 µs and low power consumption of 165 mW in single-supply mode.

Applications

• Industrial process control systems requiring precise analog signal generation.
• Programmable gain amplifiers and variable voltage references.
• Waveform generation and test equipment interfaces.

Procurement Notes

Verify the specific suffix 'BR' corresponds to the SOIC-24 package and industrial temperature range (-40°C to +85°C) as defined in the Analog Devices ordering guide. Confirm RoHS compliance status for the specific manufacturing lot, as legacy versions may differ. Ensure ESD precautions are observed during handling due to the sensitivity of the CMOS input structures.

Selection Notes

Select the AD7247ABR over the AD7237ABR when a direct 12-bit parallel interface is required without double-buffering complexity. The AD7247A allows simultaneous updating of both channels via the WR signal when both CS inputs are active. Verify that the system supply voltage falls within the specified +10.8 V to +16.5 V range to ensure accurate performance of the internal reference and output drivers.

Part Context

The AD7247ABR is an enhanced version of the industry-standard AD7247, featuring improved interface speeds 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 in an LC2MOS process. This monolithic design reduces board space and increases reliability compared to multi-chip DAC solutions.

Replacement Considerations

The AD7247ABRZ is the lead-free equivalent of the AD7247ABR. For pin-compatible alternatives with similar specifications, consider the AD7245 series or the AD7237A variants, noting differences in interface buffering and accuracy grades.