AD7228KRZ

Overview

The AD7228KRZ 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 ±2 LSB, and power supply currents of 16 mA (IDD) and 14 mA (ISS).

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 ensures high speed and linearity without user trimming.
• Flexible power options supporting both dual supplies (-5 V/+15 V) and single 5 V operation.

Applications

• Automated test equipment requiring timing deskew and coarse/fine adjustment circuits.
• Multi-channel signal generation systems utilizing microprocessor control.
• Self-programmable reference applications using feedback configurations.

Procurement Notes

Verify the package type matches the design requirements, as the AD7228 series includes 24-lead PDIP/CERDIP/SOIC and 28-lead PLCC variants. Confirm that the 'K' suffix denotes the standard performance grade specified in the datasheet. Ensure the ordering suffix aligns with the specific pinout and packaging configuration intended for the PCB layout.

Selection Notes

Select this component when multiple isolated DAC channels are required in a compact footprint. The K version offers ±2 LSB total unadjusted error and 5 µs settling time. Consider the PLCC variant if surface-mount assembly is preferred over through-hole packages. Verify that the load resistance meets the minimum 2 kΩ requirement for specified performance.

Part Context

The AD7228KRZ belongs to the Analog Devices AD7228 family of octal DACs. It utilizes LC2MOS technology to integrate precision analog circuits with high-speed digital logic. The 'K' suffix identifies the standard performance grade within the product line, which is available in various packages including plastic DIP, ceramic DIP, SOIC, and PLCC.

Replacement Considerations

Direct functional substitutes within the same family include the AD7228BQ, AD7228KNZ, and AD7228KPZ. These parts share identical electrical characteristics but differ in package style (e.g., CDIP, PDIP, PLCC) or temperature range qualifications. Verify pin compatibility before substitution.