AD7237KRZ

Overview

The AD7237KRZ is a dual 12-bit voltage-output digital-to-analog converter (DAC) housed in a 24-lead Small Outline Integrated Circuit (SOIC) package. Fabricated using Linear Compatible CMOS (LC2MOS) technology, it integrates two DAC channels with on-chip output amplifiers and a Zener voltage reference. The device operates from single or dual power supplies ranging from +10.8 V to +16.5 V for VDD and -10.8 V to -16.5 V for VSS. It features parallel data loading structures, with settling times typically around 8 µs to within ±1/2 LSB. The component supports unipolar ranges of 0 V to +5 V and 0 V to +10 V, as well as a bipolar range of ±5 V when using dual supplies.

Feature Summary

• Dual 12-bit resolution with integrated buffered output amplifiers and internal 5 V reference.
• LC2MOS monolithic construction allowing operation from 12 V to 15 V supplies.
• Parallel interface logic compatible with 8-bit and 16-bit microprocessor buses.
• Configurable output ranges: 0 V to +5 V, 0 V to +10 V (unipolar), and ±5 V (bipolar).

Applications

• Industrial process control systems requiring precise analog signal generation.
• Portable instrumentation utilizing single-supply operation.
• Microprocessor-based data acquisition and control loops.

Procurement Notes

Verify the specific suffix 'KRZ' against the manufacturer's current ordering guide, as legacy SOIC variants may have distinct availability statuses or environmental compliance designations compared to standard DIP packages. Confirm that the industrial temperature grade (-40°C to +85°C) aligns with system requirements, as extended temperature versions utilize different suffixes.

Selection Notes

Select this component for applications requiring dual-channel precision with minimal external component count due to the integrated reference and buffers. Ensure the power supply rails fall within the specified +10.8 V to +16.5 V range for optimal performance. For systems with 8-bit microprocessors, utilize the double-buffered input structure; for 16-bit systems, consider if the pinout compatibility allows direct interfacing or if an alternative model like the AD7247A is more suitable for single-cycle loading.

Part Context

The AD7237KRZ belongs to the AD7237A/AD7247A family of enhanced DACPORT devices. It serves as the dual-channel variant with an 8+4 bit parallel loading structure, distinguishing it from the AD7247A which accepts full 12-bit parallel words simultaneously. This family represents an improvement over earlier industry standards with faster interface times and wider supply voltage tolerance.

Replacement Considerations

Direct replacements include other variants within the AD7237A family such as the AD7237ABR or AD7237AN depending on the required accuracy grade and package type. Verify pin compatibility when substituting with the AD7247A, as the latter uses a different addressing scheme despite similar functionality.