AD7237ABR

Overview

The AD7237ABR is a dual 12-bit voltage-output digital-to-analog converter (DAC) from the DACPORT family, housed in a 24-lead SOIC package. It integrates two CMOS DACs with on-chip buffered output amplifiers and a Zener voltage reference. The device supports parallel data interfaces and operates from single or dual supplies ranging from +10.8 V to +16.5 V for VDD and -10.8 V to -16.5 V for VSS. Key performance metrics include a settling time of 8 µs to within ±1/2 LSB, a relative accuracy of ±1/2 LSB, and differential nonlinearity of ±0.9 LSB maximum. It functions within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Dual 12-bit architecture with integrated buffered output amplifiers and internal 5 V reference.
• Parallel interface with double-buffered input latches for microprocessor compatibility.
• Configurable output ranges: 0 V to +5 V, 0 V to +10 V (unipolar), and ±5 V (bipolar).
• High-speed operation with 8 µs typical settling time and low power consumption.

Applications

• Industrial process control systems requiring precise analog signal generation.
• Portable instrumentation utilizing single-supply operation capabilities.
• Multi-channel data acquisition systems needing simultaneous DAC updates via LDAC.

Procurement Notes

Verify the specific suffix 'BR' corresponds to the SOIC-24 package and industrial temperature grade (-40°C to +85°C) required for the design. Confirm that the ordering suffix does not alter the electrical function unless explicitly stated in the manufacturer's documentation. Ensure ESD precautions are observed during handling due to the CMOS construction.

Selection Notes

Select this component when a dual-channel solution is needed to save board space compared to discrete DACs. Choose the AD7237A variant over the AD7247A if interfacing with 8-bit microprocessors, as it utilizes an 8+4 bit loading structure rather than a direct 12-bit parallel load. Verify supply voltage requirements align with the ±10.8 V to ±16.5 V operational range for specified performance.

Part Context

The AD7237ABR is part of the enhanced AD7237A/AD7247A series, which improves upon the original industry-standard AD7237/AD7247 parts. Enhancements include wider supply voltage tolerance, faster interface times, and improved reference stability. It is fabricated using Linear Compatible CMOS (LC2MOS) technology, combining precision bipolar circuits with low-power CMOS logic.

Replacement Considerations

The AD7237ABRZ is the lead-free RoHS-compliant version of the AD7237ABR. Both share identical electrical specifications and pinouts. The AD7237ABR is marked as obsolete in some distributor listings, making the ABRZ the primary active substitute for new designs.