AD7237AAR-REEL

Overview

The AD7237AAR-REEL is a dual 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices, packaged in a 24-lead Small Outline Integrated Circuit (SOIC). It integrates on-chip voltage references and output amplifiers. The device operates with a single supply of +10.8 V to +16.5 V or dual supplies of ±10.8 V to ±16.5 V. Key electrical specifications include a maximum settling time of 8 µs for the A version, relative accuracy of ±1 LSB, and differential nonlinearity of ±0.9 LSB. It features an 8-bit wide parallel data bus interface with double buffering.

Feature Summary

• Dual 12-bit DAC architecture with integrated Zener voltage reference and buffered output amplifiers
• Parallel loading structure with 8-bit data bus and 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)
• Settling time of 8 µs typical, with power dissipation of 165 mW typical in single supply mode

Applications

• Industrial process control systems requiring precise analog signal generation
• Portable instrumentation utilizing single-supply operation
• Microprocessor-based data acquisition systems interfacing via 8-bit buses

Procurement Notes

Verify that the specific ordering suffix corresponds to the SOIC package and reel packaging configuration required for the assembly line. Confirm the temperature grade matches the application environment, as the 'A' suffix denotes the industrial range. 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 over the AD7247A if the system utilizes an 8-bit microprocessor data bus, as it supports double-buffered loading. Verify that the required output swing fits within the supported unipolar or bipolar configurations defined by the ROFS pin connections.

Part Context

This part belongs to the AD7237/AD7247 family of LC2MOS DACPORTs. It serves as an enhanced version of the industry-standard AD7237, offering improved interface speeds and wider supply voltage tolerance. The 'R' designation indicates the SOIC package option, while 'A' specifies the industrial temperature performance tier.

Replacement Considerations

The AD7237ABRZ is a direct replacement offering higher precision with ±1/2 LSB relative accuracy. For military-grade requirements, the AD7237KN/883B provides hermetic DIP packaging processed to MIL-STD-883 standards.