AD7228KPZ

Overview

The AD7228KPZ is an octal 8-bit voltage-mode digital-to-analog converter (DAC) fabricated on LC2MOS CMOS 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 (VDD: 13.5 V to 16.5 V). Key electrical parameters include a settling time of 5 µs for positive full-scale changes and 7 µs for negative changes in single-supply mode, with INL/DNL specified at ±1 LSB.

Feature Summary

• Octal architecture integrating eight independent 8-bit DACs with buffered outputs on one monolithic chip.
• Microprocessor-compatible parallel interface with TTL/CMOS levels and individual latch control via A0-A2 address lines.
• Flexible power supply options supporting dual supplies (-5 V/VDD) or single supply (+15 V) operation.
• High-speed performance with 5 µs settling time and guaranteed monotonicity without user trimming.

Applications

• Automated test equipment requiring multi-channel signal generation.
• Industrial process control systems utilizing multiple analog outputs.
• Instrumentation applications needing precise voltage references or waveform synthesis.

Procurement Notes

Verify the specific suffix 'K' against the manufacturer's current ordering guide to confirm temperature range and accuracy grade. Ensure the design accommodates the 28-lead PLCC package dimensions and soldering thermal profiles. Confirm that the system power rails align with the specified VDD and VSS ranges for the selected operating mode.

Selection Notes

Select this component when a compact solution for eight simultaneous 8-bit conversions is required. The KPZ variant offers surface-mount convenience via the PLCC package. Designers must account for the external reference requirements and ensure the load resistance meets the minimum 2 kΩ specification to maintain accuracy. Consider the 5 V single-supply option if power dissipation reduction is critical.

Part Context

The AD7228 series belongs to Analog Devices' LC2MOS family of high-speed linear CMOS converters. The KPZ designation specifically identifies the 28-lead Plastic Leadless Chip Carrier (PLCC) surface-mount package variant within the broader AD7228 product line, which also includes PDIP and SOIC packages.

Replacement Considerations

Direct pin-for-pin replacements within the same package are limited. Other variants in the AD7228 family (e.g., AD7228ACPZ) share the same functionality but may differ in package type or speed grade. Verify compatibility with existing board layouts when substituting between package styles.