AD7237ABR-REEL

Overview

The AD7237ABR-REEL is a dual 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices, packaged in a 24-lead SOIC. It integrates on-chip voltage references and output amplifiers, eliminating the need for external trimming. The device operates with supply voltages ranging from +10.8 V to +16.5 V on VDD and -10.8 V to -16.5 V on VSS. Key performance metrics include a settling time of 8 µs to within ±1/2 LSB, a relative accuracy of ±1/2 LSB for the B-grade version, and a typical power dissipation of 165 mW in single-supply mode. The part supports both unipolar and bipolar output configurations.

Feature Summary

• Dual 12-bit DAC architecture with integrated buffered output amplifiers and internal 5 V Zener reference.
• High-speed parallel interface with 30 ns typical data setup time; AD7237A uses an 8+4 bit loading structure.
• Flexible power supply operation: Single supply (+12 V to +15 V) or dual supplies (±12 V to ±15 V).
• Configurable output ranges including 0 V to +5 V, 0 V to +10 V, and ±5 V via ROFS pins.

Applications

• Direct interfacing with 8-bit and 16-bit microprocessors and DSPs.
• Multi-channel data acquisition systems requiring simultaneous updates.
• Industrial process control and instrumentation signal generation.
• Programmable power supplies and waveform generators.

Procurement Notes

Verify that the specific suffix 'REEL' corresponds to tape-and-reel packaging as indicated by distributor listings for this part number. Confirm the 'B' grade designation ensures ±1/2 LSB maximum relative accuracy per the datasheet specifications. Ensure ESD precautions are observed during handling due to the sensitivity of the CMOS input structures.

Selection Notes

Select the AD7237ABR variant over the AD7237AAR if tighter linearity specifications (±1/2 LSB vs ±1 LSB) are required. Choose the AD7237A model for systems utilizing an 8-bit data bus with double-buffered input latches, whereas the AD7247A offers a direct 12-bit parallel load structure. Ensure the application requires the specified ±10.8 V to ±16.5 V supply range, as lower voltage operation is not supported.

Part Context

This component belongs to the AD7237A/AD7247A DACPORT family, which represents an enhanced version of the industry-standard AD7237/AD7247. Improvements include faster interface times, improved reference variations with VDD, and extended supply voltage compatibility starting at 12 V. The family utilizes Linear Compatible CMOS (LC2MOS) technology to combine precision bipolar circuits with low-power CMOS logic.

Replacement Considerations

The AD7237ABRZ is the lead-free RoHS-compliant equivalent of the AD7237ABR. For systems requiring a direct 12-bit parallel interface instead of the 8+4 bit structure, the AD7247ABRZ serves as a functional pin-compatible alternative within the same package.