AD7228ABPZ-REEL

Overview

The AD7228ABPZ-REEL is an octal 8-bit voltage-mode digital-to-analog converter (DAC) fabricated on LC2MOS CMOS process. 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 TTL/CMOS-compatible parallel data bus and three address lines (A0-A2). It supports both single-supply operation (VDD = 13.5 V to 16.5 V) and dual-supply configurations (VDD = 10.8 V to 16.5 V, VSS = -4.5 V to -5.5 V). Key performance metrics include a settling time of 5 µs for positive full-scale changes and 7 µs for negative changes in single-supply mode, with a maximum power dissipation of 1 W.

Feature Summary

• Octal architecture: Eight independent 8-bit DACs with integrated unity-gain output buffer amplifiers.
• Flexible supply options: Operates from a single +15 V supply or dual supplies (+15 V/-5 V).
• Microprocessor compatible: Features speed-compatible control logic with a 95 ns minimum write pulse width.
• High accuracy: Guaranteed monotonicity with ±1 LSB differential nonlinearity and ±1 LSB relative accuracy.

Applications

• Automated test equipment requiring multi-channel signal generation.
• Industrial process control systems utilizing multiple analog outputs.
• Programmable power supplies and setpoint controllers.
• Timing deskew circuits in high-speed digital systems.

Procurement Notes

Verify the package type associated with the 'BPZ' suffix against the manufacturer's ordering guide, as standard AD7228 packages include PDIP, CERDIP, SOIC, and PLCC. Confirm that the reel packaging quantity matches system requirements. Ensure the specific grade (B version) meets the required static and dynamic performance specifications for the application environment.

Selection Notes

Select this component when multiple isolated DAC channels are needed in a compact form factor. The B version offers ±1 LSB total unadjusted error compared to ±2 LSB for K versions. Ensure the reference voltage source can handle the varying input impedance (2 kΩ to infinity) caused by code-dependent loading. For single-supply designs, verify that the output sink capability near 0 V is sufficient for the load requirements.

Part Context

The AD7228 series utilizes LC2MOS technology to integrate high-speed digital logic with precision analog circuits. This model represents the octal variant, distinct from quad or dual DAC offerings. The 'ABPZ' designation indicates a specific temperature range and package configuration within the Analog Devices portfolio, designed for robust performance in industrial environments ranging from -40°C to +85°C.

Replacement Considerations

Direct pin-compatible replacements within the same family include the AD7228K and AD7228L variants, though these differ in accuracy specifications. Other octal DACs may require significant circuit redesign due to differences in latch architecture, supply voltage ranges, or output buffering capabilities.