AD7228LNZ

Overview

The AD7228LNZ is an LC2MOS octal 8-bit digital-to-analog converter featuring integrated output buffer amplifiers. It operates with single or dual supplies, supporting VDD ranges of 10.8 V to 16.5 V and VSS of −5 V ± 10%. The device provides eight independent DAC channels with individual latches, controlled via a common 8-bit parallel data bus and address inputs (A0–A2). Key electrical specifications include a maximum settling time of 5 µs for positive full-scale changes and ±1 LSB differential nonlinearity in L/C versions. It utilizes a 24-lead PDIP package.

Feature Summary

• Octal architecture integrating eight 8-bit voltage-mode DACs with unity-gain buffer amplifiers on a single chip.
• Compatible with TTL/CMOS logic levels and microprocessors, featuring speed-compatible write pulses.
• Supports both single-supply (VDD = 15 V) and dual-supply (VDD = +15 V, VSS = −5 V) operation.
• Guaranteed monotonic performance with R-2R ladder architecture and no user trims required.

Applications

• Automated test equipment requiring timing deskew and coarse/fine adjustment circuits.
• Multi-channel signal generation systems utilizing multiple converters.
• Microprocessor-based control systems interfacing via standard 8-bit buses.
• Setpoint controllers and programmable reference applications.

Procurement Notes

Verify the suffix 'LNZ' indicates lead-free compliance against the manufacturer's current ordering guide. Confirm the package type matches the 24-lead Plastic Dual In-Line Package (PDIP) specifications. Ensure supply voltages remain within the absolute maximum ratings to prevent damage.

Selection Notes

Select the L or C version for tighter static performance metrics, specifically ±1 LSB total unadjusted error and differential nonlinearity compared to K/B versions. Ensure the reference voltage source can handle the code-dependent input impedance variations. Verify that the load resistance meets the minimum 2 kΩ requirement for specified output drive capabilities.

Part Context

The AD7228 is fabricated using Analog Devices' LC2MOS process, combining high-speed digital logic with precision analog circuits. This technology allows for the integration of eight DACs and amplifiers in a compact footprint, reducing board space requirements while maintaining high reliability for systems requiring multiple converters.

Replacement Considerations

The AD7228LN is the direct predecessor part number. Verify pinout compatibility and ensure the replacement component meets the same LC2MOS process specifications for performance equivalence.