AD7226KNZ

Overview

The AD7226KNZ is a monolithic quad 8-bit digital-to-analog converter (DAC) fabricated in LC2MOS process. It integrates four voltage-output DACs with buffer 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 amplifier can drive up to 5 mA of current and includes laser-trimmed offsets. The part supports dual supply operation (VDD: 11.4 V to 16.5 V; VSS: -5 V) or single supply operation at +15 V, with reference voltages ranging from 2 V to (VDD – 4 V).

Feature Summary

• Four independent 8-bit DACs with integrated buffered voltage outputs.
• Separate data latches per channel with microprocessor-compatible parallel interface.
• Laser-trimmed amplifier offsets requiring no user calibration.
• LC2MOS fabrication ensuring precise DAC-to-DAC matching and tracking.

Applications

• Process control systems requiring multi-channel analog output.
• Automatic test equipment for signal generation.
• Automatic calibration of large system parameters such as gain and offset.

Procurement Notes

Verify that the ordering suffix 'KNZ' corresponds to the specified package and temperature range in the manufacturer's official documentation. Confirm RoHS compliance status directly from the datasheet revision notes. Ensure the selected variant matches the required operating temperature range of -40°C to +85°C for industrial applications.

Selection Notes

Select this component when multiple synchronized 8-bit voltage outputs are needed in a compact form factor. The parallel interface requires sufficient address decoding logic if interfacing with complex microprocessors. Consider the settling time of 4 µs and the 5 mA output drive capability against load requirements. Single-supply operation is possible but may affect sink current capability near ground compared to dual-supply configurations.

Part Context

The AD7226 belongs to the family of high-speed CMOS D/A converters designed for precision applications. It combines digital logic and analog circuitry on one chip to reduce board space and improve reliability. The device is suitable for systems where channel matching and minimal external component count are critical design constraints.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the verified source material.