AD7841ASZ-REEL

Overview

The AD7841ASZ-REEL is an octal 14-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It integrates eight independent DAC channels within a single monolithic chip, housed in a 44-lead MQFP package. The device accepts straight binary parallel data via DB0–DB13 and utilizes address pins A0–A2 for channel selection. Outputs are buffered with gain-of-two amplifiers, enabling full-scale ranges of ±10 V with ±5 V references or up to ±15 V with ±10% operation. Key specifications include a typical settling time of 31 µs, relative accuracy of ±2 LSB (B grade), and power supplies of +15 V, –15 V, and +5 V logic.

Feature Summary

• Octal architecture containing eight independent 14-bit R-2R voltage-mode DACs
• Parallel input interface with individual input registers and simultaneous LDAC update capability
• Offset adjustment for each DAC pair via dedicated DUTGNDx sense ground pins
• Asynchronous clear function (CLR) to switch outputs to user-defined DUTGND potential

Applications

• Automatic Test Equipment (ATE) pin electronics and driver circuits
• Process control systems requiring multiple synchronized analog outputs
• General purpose instrumentation utilizing bipolar or unipolar voltage generation

Procurement Notes

Verify the ASZ suffix indicates lead-free RoHS-compliant packaging compared to non-Z equivalents. Confirm the REEL suffix matches automated surface-mount assembly requirements rather than tube packaging. Ensure the specific temperature grade (A or B) aligns with system operational limits, as performance parameters such as relative accuracy vary between grades.

Selection Notes

Select the AD7841 when eight isolated 14-bit channels are required in a compact footprint. The B-grade version offers superior relative accuracy (±2 LSB) compared to the A-grade (±4 LSB). Designers must account for the requirement of dual ±15 V analog supplies and a separate +5 V logic supply. The parallel interface necessitates sufficient microcontroller or DSP I/O lines for the 14-bit data bus and control signals.

Part Context

This component belongs to the AD7841 family of octal DACs. The ASZ-REEL designation specifies the industrial temperature range variant packaged in tape and reel format for high-volume surface-mount production. It serves as a multi-channel solution replacing discrete DAC arrays in applications demanding precise voltage referencing and low crosstalk.

Replacement Considerations

Public confirmed substitute part numbers: None identified.