AD7226BQ

Overview

The AD7226BQ is a monolithic quad 8-bit digital-to-analog converter featuring integrated output buffer amplifiers and interface logic. Fabricated using LC2MOS technology, it provides four independent voltage-output DACs with laser-trimmed offsets, eliminating the need for external nulling. The device utilizes a common 8-bit TTL/CMOS-compatible data bus with individual latches controlled by A0, A1, and WR signals. It supports dual supply operation (VDD: 11.4 V to 16.5 V; VSS: -5 V) or single supply (+15 V). Key electrical parameters include a settling time of 4 µs to ±1/2 LSB, relative accuracy of ±0.5 LSB, and differential nonlinearity of ±1 LSB. The B version operates within an extended temperature range of -40°C to +85°C.

Feature Summary

• Four independent 8-bit DACs with integrated unity-gain buffer amplifiers on a single chip.
• TTL/CMOS-compatible parallel interface with separate latches for each channel selected via A0/A1 address lines.
• Laser-trimmed amplifier offsets ensure no user trimming is required for specified performance.
• Supports both dual supply (-5 V/VDD) and single supply (+15 V) configurations.

Applications

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

Procurement Notes

Verify the specific suffix 'BQ' against the manufacturer's current product line status, as datasheets often list K and B versions. Confirm package availability, as the datasheet specifies skinny 20-lead DIP, SOIC, SSOP, and PLCC options. Ensure the design accounts for the absolute maximum ratings, particularly regarding VDD to AGND and VSS limits, to prevent permanent damage during procurement validation.

Selection Notes

Select the AD7226BQ when multiple synchronized 8-bit voltage outputs are needed with high channel-to-channel matching inherent from monolithic fabrication. Choose this component over discrete solutions to reduce board space and improve reliability. Verify that the required reference voltage range (2 V to VDD-4 V) aligns with available reference sources. Consider the 4 µs settling time and 2.5 V/ms slew rate for dynamic application requirements.

Part Context

The AD7226 belongs to Analog Devices' LC2MOS family of data converters, designed to integrate high-speed digital logic with precision analog circuits. The 'B' suffix denotes the industrial temperature grade (-40°C to +85°C), while 'Q' typically indicates a specific packaging or qualification variant not fully detailed in the general functional description but consistent with the 20-pin skinny DIP/SOIC form factors listed.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material. Designers should verify pin compatibility and electrical specifications if considering alternative quad 8-bit DACs from other manufacturers.