AD7834AR-REEL

Overview

The AD7834AR-REEL is a quad 14-bit digital-to-analog converter (DAC) manufactured by Analog Devices Inc. It features four independent voltage-output DACs within a single monolithic chip, utilizing an LC2MOS architecture and R-2R segmented design. The device supports serial data loading via DIN, SCLK, and FSYNC pins, allowing for up to 32 units to be addressed individually using PA0–PA4 pins. It operates with dual analog supplies of ±15 V nominal and a 5 V logic supply. Key performance metrics include a maximum output span of 14 V, a typical settling time of 10 µs, and relative accuracy of ±2 LSB.

Feature Summary

• Quad 14-bit resolution with R-2R voltage-mode architecture
• Serial interface supporting MSB-first 16-bit data format after two leading zeros
• User-assigned addressing via five dedicated package address pins (PA0–PA4)
• Asynchronous clear function to set outputs to the Device Sense Ground (DSG) potential

Applications

• Process control systems
• Automatic test equipment
• General-purpose instrumentation

Procurement Notes

Verify component authenticity through authorized distributors or manufacturer channels. Confirm the specific 'REEL' packaging suffix matches production requirements. Check for End-of-Life (EOL) status as older revisions may be discontinued. Ensure environmental compliance documentation aligns with project specifications.

Selection Notes

Select the AD7834AR-REEL when multiple isolated 14-bit voltage outputs are required in a space-constrained design. The serial interface reduces pin count compared to parallel alternatives like the AD7835. Ensure the application can accommodate the required ±15 V analog power supplies and 5 V logic levels. Verify that the 10 µs settling time meets system speed requirements.

Part Context

This component belongs to the AD7834/AD7835 family of high-precision DACs from Analog Devices. The AD7834 variant specifically utilizes a serial input method, distinguishing it from the parallel-loaded AD7835. The 'AR' designation indicates a 28-lead SOIC surface-mount package, while '-REEL' specifies tape-and-reel packaging for automated assembly.

Replacement Considerations

Direct substitutes may include the AD7834BRZ or AD7834ARZ depending on accuracy grade and packaging preferences. Verify pin compatibility and electrical specifications before substitution. Parallel-loading variants like the AD7835 require significant circuit redesign due to different interface requirements.