AD7841ASZ

Overview

The AD7841ASZ 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, utilizing a straight binary R-2R architecture. The device accepts parallel data inputs and provides buffered outputs with a gain of two. It operates with dual analog power supplies of ±15 V and a logic supply of +5 V. Key specifications include a maximum relative accuracy of ±2 LSB for the B-grade version, a reference input range of ±5 V to achieve a ±10 V output swing, and a typical settling time of 31 µs. The component is housed in a 44-lead MQFP package.

Feature Summary

• Octal configuration containing eight independent 14-bit DAC channels
• Parallel data interface with individual channel address decoding via A0-A2 pins
• Simultaneous output update capability using the active-low LDAC control pin
• Integrated offset adjustment for each DAC pair via dedicated DUTGND pins

Applications

• Automated Test Equipment (ATE) pin electronics
• Process control systems requiring multi-channel signal generation
• General purpose instrumentation

Procurement Notes

Verify the specific suffix 'ASZ' corresponds to the lead-free RoHS-compliant variant when sourcing. Confirm the grade designation ('A' or 'B') matches the required accuracy specifications, as performance parameters such as relative accuracy differ between versions. Ensure the 44-lead MQFP package dimensions align with the target PCB footprint.

Selection Notes

Select this component for designs requiring multiple synchronized analog outputs without external multiplexing. The B-grade version offers superior linearity with ±2 LSB relative accuracy compared to the A-grade's ±4 LSB. Designers must account for the ±15 V analog supply requirement and ensure adequate thermal management, as the junction temperature depends on ambient conditions and power dissipation within the MQFP package.

Part Context

The AD7841 belongs to Analog Devices' family of high-density multi-channel DACs. It serves as a parallel-input counterpart to serial-interface models like the AD7840. The ASZ suffix indicates a lead-free manufacturing process compliant with environmental directives, distinguishing it from older non-compliant variants while maintaining identical electrical functionality and pinout compatibility.

Replacement Considerations

Direct functional replacements within the same manufacturer portfolio include the AD7841AS and AD7841BS. When substituting, verify that the replacement part number includes the 'Z' suffix if lead-free compliance is mandatory for the assembly process.