AD7228ACNZ

Overview

The AD7228ACNZ is an octal 8-bit voltage-mode digital-to-analog converter (DAC) fabricated on LC2MOS technology. 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 parallel data bus and address inputs (A0-A2). It supports dual supplies (VDD: 10.8 V to 16.5 V; VSS: -5 V ± 10%) or single supply operation. Key electrical specifications include a settling time of 5 µs, total unadjusted error of ±1 LSB, and power consumption of 16 mA at 25°C. The component is housed in a 24-lead narrow body PDIP package.

Feature Summary

• Octal architecture with eight independent 8-bit DACs and integrated output buffers
• Microprocessor-compatible parallel interface with TTL/CMOS levels and 95 ns write pulse capability
• LC2MOS process ensuring high speed and linearity without user trimming
• Flexible power supply options supporting both dual (-5 V/+15 V) and single (+15 V) configurations

Applications

• Automated test equipment requiring precise timing deskew and coarse/fine adjustments
• Industrial process control systems utilizing multiple analog outputs
• Motor control applications needing synchronized multi-channel voltage generation
• Data acquisition systems interfacing with 8-bit microprocessors

Procurement Notes

Verify the specific suffix 'CNZ' against the manufacturer's current ordering guide to confirm package type and environmental compliance status. Ensure that the required operating temperature range aligns with the specified -40°C to +85°C industrial grade limits. Confirm pin compatibility with the 24-lead PDIP footprint during PCB layout finalization.

Selection Notes

Select this component when board space reduction is critical due to its integration of eight converters on one die. Choose the AD7228ACNZ over other grades if the ±1 LSB total unadjusted error specification is required. Ensure the application can provide a stable reference voltage between 2 V and 10 V, as performance depends heavily on VREF stability. Verify that the load resistance meets the minimum 2 kΩ requirement for specified output drive capabilities.

Part Context

The AD7228 belongs to Analog Devices' LC2MOS family of high-speed linear CMOS data converters. This series is designed for applications requiring multiple channels with tight matching and speed. The AC grade specifically denotes the commercial/industrial temperature range and accuracy class within the broader AD7228 product line, which also includes variants like the AB and BQ for different performance or packaging needs.

Replacement Considerations

Direct pin-for-pin replacements within the same package are limited to other AD7228 variants such as the AD7228ABNZ or AD7228ACPZ. When substituting, verify that the settling time and error specifications of the replacement part meet the system requirements, as different suffixes may indicate variations in speed or accuracy.