AD7226KN

Overview

The AD7226KN is a monolithic quad 8-bit digital-to-analog converter (DAC) fabricated in LC2MOS process. It integrates four voltage-output DACs with buffered amplifiers and interface logic on a single chip, eliminating the need for external trims. The device features separate on-chip latches for each channel, controlled via a common 8-bit TTL/CMOS-compatible input port. Address lines A0 and A1 select the active DAC when the write signal (WR) goes low. Each output buffer can drive up to 5 mA of current. The part supports dual supply operation (VDD: 11.4 V to 16.5 V; VSS: -5 V) or single supply operation (+15 V). Key static performance metrics include ±0.5 LSB relative accuracy, ±1 LSB differential nonlinearity, and a settling time of 4 µs maximum.

Feature Summary

• Four independent 8-bit DACs with integrated laser-trimmed output buffer amplifiers
• Microprocessor-compatible parallel interface with individual data latches per channel
• Single-supply or dual-supply operation capability
• No user trims required for specified performance

Applications

• Process control systems
• Automatic test equipment
• Automatic calibration of large system parameters such as gain and offset

Procurement Notes

Verify the specific suffix 'K' indicates the temperature range of -40°C to +85°C. Confirm package type matches the 'N' designation for Skinny 20-Lead DIP. Ensure reference voltage requirements align with the selected power supply configuration, noting that VREF must be at least 4 V below VDD for specified performance.

Selection Notes

Select the AD7226KN for applications requiring four synchronized 8-bit voltage outputs with high matching precision due to monolithic fabrication. Consider the 4 µs settling time and 5 mA output drive capability for dynamic load requirements. Verify compatibility with the host microprocessor's data bus width and control signals, specifically the WR, A0, and A1 inputs.

Part Context

The AD7226 belongs to the Analog Devices LC2MOS family of high-speed data converters. The 'K' suffix denotes the industrial temperature grade (-40°C to +85°C), while 'N' specifies the skinny 20-lead DIP package. This component is designed to replace discrete multi-channel DAC solutions, reducing board space and improving channel-to-channel matching.

Replacement Considerations

Direct pin-for-pin replacements may include other quad 8-bit DACs from the same manufacturer family, such as the MX7226. Verify interface logic compatibility and output drive specifications when substituting.