AD7228LN

Overview

The AD7228LN is an obsolete LC2MOS octal 8-bit voltage-mode digital-to-analog converter (DAC) featuring integrated output buffer amplifiers. It operates with dual supplies (VDD: 10.8 V to 16.5 V, VSS: -5 V ± 10%) or a single +15 V supply. Key electrical specifications include a maximum Total Unadjusted Error of ±1 LSB for L/C versions, a settling time of 5 µs for positive transitions and 7 µs for negative transitions in single-supply mode, and a reference input range of 2 V to 10 V. The device utilizes a common 8-bit parallel data bus with individual latches selected via A0-A2 address inputs.

Feature Summary

• Octal architecture integrating eight independent 8-bit DACs with buffered outputs on a single monolithic chip.
• LC2MOS process technology enabling high-speed digital logic and precision analog circuit integration without user trims.
• Microprocessor-compatible interface supporting TTL/CMOS levels with a 95 ns write pulse capability.
• Flexible power supply options allowing operation from dual supplies (+15 V/-5 V) or a single +15 V supply.

Applications

• Automated test equipment requiring programmable timing deskew and coarse/fine adjustments.
• Multi-channel signal generation systems utilizing the compact skinny 24-lead PDIP package.
• Industrial control interfaces compatible with standard 8-bit microprocessors like the 8085A or Z80.

Procurement Notes

The AD7228LN is officially discontinued and no longer manufactured by Analog Devices Inc. Verification of availability should focus on surplus distributors or direct replacement part numbers such as the AD7228LNZ. Due to its obsolete status, lead times and stock levels are subject to market variability rather than standard production schedules.

Selection Notes

Select the AD7228LN when an octal DAC configuration is required to minimize board space compared to discrete solutions. Ensure the application supports the specific 24-lead PDIP, CERDIP, or SOIC pinout, which separates analog and digital inputs. Verify that the system can accommodate the required 10.8 V to 16.5 V positive supply and -5 V negative supply for optimal performance specifications.

Part Context

The AD7228LN belongs to the AD7228 family of LC2MOS DACs. It is functionally similar to other variants in the series but distinguished by its specific package type and grade. The 'L' suffix typically denotes a specific temperature or accuracy grade within the broader AD7228 product line, which also includes ceramic DIP and surface-mount PLCC options.

Replacement Considerations

The AD7228LNZ is listed as a direct substitute. Users must verify if the 'Z' suffix indicates RoHS compliance changes without altering functional parameters. No other cross-model substitutes are confirmed in the provided documentation.