AD7237AARZ-REEL

Overview

The AD7237AARZ-REEL is a dual 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices, packaged in a 24-lead SOIC. It integrates two CMOS DACs with on-chip buffered 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 -16.5 V to 0 V for VSS. Key electrical specifications include a typical settling time of 8 µs to within ±1/2 LSB, a maximum relative accuracy of ±1 LSB, and a power dissipation of 165 mW in single-supply mode. The part utilizes an LC2MOS process and features a parallel loading structure compatible with 8-bit microprocessor buses.

Feature Summary

• Dual 12-bit DAC architecture with integrated buffered output amplifiers and internal 5 V reference.
• Parallel interface logic: AD7237A uses an 8+4 bit double-buffered structure; AD7247A uses an 8+4 direct load structure.
• Flexible supply operation supporting single (+12 V to +15 V) or dual (±12 V to ±15 V) configurations.
• Configurable output ranges including 0 V to +5 V, 0 V to +10 V, and ±5 V via external resistor connections.

Applications

• Microprocessor-based data acquisition systems requiring dual-channel analog output.
• Industrial control loops utilizing 8-bit or 16-bit bus architectures.
• Portable instrumentation powered by single supply rails.
• Signal generation circuits requiring simultaneous update capabilities via the LDAC pin.

Procurement Notes

Verify the specific suffix against the ordering guide to confirm temperature range and package type. The 'AR' suffix indicates a 24-lead Small Outline (SOIC) package. Ensure the reel quantity matches production requirements. Confirm that the A-grade specification meets the required linearity and accuracy tolerances for the application environment.

Selection Notes

Select the AD7237A variant if interfacing with 8-bit microprocessors requiring a double-buffered input latch structure. Choose the AD7247A if a simpler parallel interface with independent chip selects for each DAC is preferred. Verify that the required output voltage range (unipolar vs. bipolar) aligns with the available supply voltages and ROFS pin configurations.

Part Context

This component belongs to the DACPORT family, which combines precision DACs with output buffers on a single monolithic CMOS chip. The AD7237A is an enhanced version of the industry-standard AD7237, offering improved interface speeds and wider supply voltage tolerance. It serves as a space-saving alternative to multi-chip DAC designs.

Replacement Considerations

The AD7237ABRZ is a direct replacement with tighter accuracy specifications (±1/2 LSB max). For extended temperature ranges (-55°C to +125°C), consider the AD7237ATQ variant. Ensure pin compatibility when substituting between DIP and SOIC packages.