AD7228KN

Overview

The AD7228KN is an octal 8-bit voltage-mode digital-to-analog converter (DAC) fabricated on LC2MOS CMOS technology. It integrates eight DACs with output buffer amplifiers and interface logic on a single chip, eliminating the need for external trims. The device features individual latches for each channel, controlled via a common 8-bit parallel data bus and address inputs (A0-A2). 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 settling time of 5 µs, differential nonlinearity of ±1 LSB, and a maximum power dissipation of 1 W.

Feature Summary

• Octal architecture containing eight independent 8-bit DACs with integrated output buffers.
• Microprocessor-compatible parallel interface with TTL/CMOS levels and 95 ns write pulse compatibility.
• LC2MOS process ensures high speed and linearity without requiring user calibration.
• Supports unipolar and bipolar output configurations using external components.

Applications

• Automated test equipment requiring multi-channel signal generation.
• Industrial control systems utilizing microprocessor-based architectures.
• Programmable power supplies and waveform generators.

Procurement Notes

Verify the specific suffix 'KN' against the manufacturer's ordering guide to confirm package type (PDIP/CERDIP/SOIC) and temperature grade. Confirm that the required supply voltages align with the specified ranges for K-grade devices. Ensure ESD precautions are observed during handling due to MOS input structures.

Selection Notes

Select this component when multiple isolated 8-bit outputs are required in a compact form factor. The AD7228KN is suitable for applications needing fast settling times (5 µs) and monotonic operation. Consider the 24-lead package constraints and ensure adequate board space for the narrow-body DIP or SOIC footprint. Verify reference voltage stability as the input impedance varies with code.

Part Context

The AD7228 belongs to the Analog Devices LC2MOS family of octal DACs. It is designed to replace discrete solutions or slower parallel DACs in systems requiring eight channels. The 'K' designation typically indicates the commercial temperature range (-40°C to +85°C), while 'N' refers to the plastic packaging variant.

Replacement Considerations

Direct pin-compatible replacements within the same family may include other suffixes of the AD7228 series (e.g., AD7228BQ for ceramic packages) if package changes are acceptable. Cross-family comparisons should focus on settling time and channel count rather than assuming identical pinouts.