AD7237JR

Overview

The AD7237JR is a dual 12-bit voltage-output digital-to-analog converter (DAC) from the DACPORT family, fabricated in LC2MOS technology. It integrates two independent DAC channels with on-chip output amplifiers and a Zener voltage reference. The device supports parallel data loading via an 8+4 bit structure for the AD7237 variant, featuring asynchronous LDAC control for simultaneous updates. It operates on single or dual supplies ranging from ±10.8 V to ±16.5 V, delivering buffered analog outputs with a typical settling time of 8 µs. The component is housed in a 24-lead plastic DIP package.

Feature Summary

• Dual 12-bit resolution with integrated output amplifiers and internal 5 V reference
• Parallel interface with double-buffered input latches (8-bit LSB + 4-bit MSB)
• Asynchronous LDAC signal enables simultaneous updating of both DAC channels
• Configurable output ranges: 0–5 V, 0–10 V (unipolar), or ±5 V (bipolar)

Applications

• Industrial process control systems requiring multi-channel signal generation
• Microprocessor-based instrumentation with 8-bit data bus architectures
• Programmable power supply designs utilizing buffered voltage outputs

Procurement Notes

Verify the specific temperature grade suffix associated with the JR designation against the manufacturer's ordering guide, as performance specifications vary between industrial and extended temperature ranges. Confirm package availability and lead times through authorized distribution channels prior to integration planning.

Selection Notes

Select this component for applications requiring monolithic dual-channel conversion without external trimming. Ensure the system microprocessor can accommodate the double-buffered write sequence required for the 8+4 bit interface. Verify that the supply voltage range aligns with the required unipolar or bipolar output configurations.

Part Context

The AD7237JR belongs to the enhanced AD7237A/AD7247A series, which improves upon earlier industry standards by offering faster interface times and wider supply voltage operation. It serves as a space-saving alternative to multichip DAC designs, combining precision analog circuits with CMOS logic on a single die.

Replacement Considerations

Direct replacements include the AD7237ABRZ for surface-mount SOIC applications or the AD7237JN for equivalent PDIP packaging. Verify pin compatibility and interface logic differences when substituting with the AD7247A variant, which utilizes a different parallel loading structure.