AD7226KRZ

Overview

The AD7226KRZ is a quad 8-bit digital-to-analog converter featuring integrated voltage-output buffer amplifiers and interface logic. Fabricated using LC2MOS technology, it provides four independent DAC channels with separate on-chip latches controlled via a common 8-bit TTL/CMOS-compatible parallel bus. The device 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. It operates within an extended temperature range of –40°C to +85°C.

Feature Summary

• Four independent 8-bit DACs with laser-trimmed output buffer amplifiers capable of driving up to 5 mA.
• Microprocessor-compatible parallel interface with individual addressable latches for each channel.
• LC2MOS monolithic construction ensuring precise DAC-to-DAC matching and tracking.
• Supports both dual supply (±5 V/negative rail) and single supply (+15 V) configurations.

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.
• Three-phase sine wave generation for motor control applications.

Procurement Notes

Verify the KRZ suffix indicates the K-temperature grade (-40°C to +85°C) and the Z RoHS-compliant packaging variant. Confirm package type matches design requirements, as the KRZ designation typically corresponds to specific surface-mount or leaded packages depending on the manufacturer's current coding standards. Ensure reference voltage constraints are met for the selected supply configuration.

Selection Notes

Select the AD7226KRZ when four synchronized 8-bit voltage outputs are required with minimal external component count. The device eliminates the need for external trims due to laser trimming of amplifier offsets. Consider the 4 µs settling time and 2.5 V/ms slew rate for dynamic applications. Ensure the reference voltage remains between 2 V and (VDD – 4 V) to maintain specified linearity and monotonicity.

Part Context

The AD7226 belongs to Analog Devices' family of high-speed CMOS D/A converters. The 'K' suffix denotes the industrial temperature range extension compared to commercial variants. The 'Z' suffix signifies compliance with RoHS directives. This part integrates precision analog circuitry with digital logic on a single chip, reducing board space and improving reliability in multi-converter systems.

Replacement Considerations

The AD7226KNZ is a pin-compatible alternative with similar electrical specifications but may differ in temperature grade or packaging style. Verify that any substitute maintains the 8-bit resolution, quad-channel architecture, and parallel interface compatibility. Check if the replacement supports the same single or dual supply voltage ranges and settling time requirements.