AD7226KPZ

Overview

The AD7226KPZ is a monolithic quad 8-bit digital-to-analog converter (DAC) fabricated in LC2MOS technology. It integrates four voltage-output DACs with buffered amplifiers and interface logic on a single chip, eliminating the need for external trims. The device features separate on-chip latches for each channel, controlled via a common 8-bit TTL/CMOS-compatible input port. Address lines A0 and A1 select the active DAC when the write signal (WR) goes low. Each output buffer can drive up to 5 mA of current. The part supports dual supply operation (VDD: 11.4 V to 16.5 V; VSS: -5 V) or single supply operation at +15 V, with reference voltages ranging from 2 V to 12.5 V.

Feature Summary

• Four independent 8-bit DACs with laser-trimmed output buffer amplifiers
• TTL/CMOS-compatible 8-bit parallel data interface with individual latches
• LC2MOS process ensures precise channel-to-channel matching and tracking
• Supports both dual supply (-5 V/VDD) and single supply (+15 V) configurations

Applications

• Process control systems requiring multiple analog outputs
• Automatic test equipment for signal generation
• Automatic calibration of large system parameters such as gain and offset

Procurement Notes

Verify that the suffix 'K' corresponds to the specified temperature range of -40°C to +85°C. Confirm the package type matches the required footprint, as the KPZ designation indicates a PLCC package. Ensure power supply rails meet the minimum differential requirements between VDD and VREF for specified performance.

Selection Notes

Select the AD7226KPZ when four synchronized 8-bit voltage outputs are needed with high matching accuracy. The PLCC package is suitable for surface-mount applications requiring a compact form factor. Consider the settling time of 4 µs and the 5 mA output drive capability when designing load circuits. Verify that the microprocessor interface timing meets the setup and hold requirements for WR, A0, and A1 signals.

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 KPZ variant specifically denotes the plastic leaded chip carrier package. This component serves as a cost-effective solution for multi-channel DAC applications where board space is limited and channel matching is critical.

Replacement Considerations

Direct pin-for-pin replacements within the same package may include other variants of the AD7226 series, such as the AD7226KNZ (DIP) or AD7226KSZ (SOIC), provided the package style is compatible. Cross-family replacements require careful evaluation of interface logic, supply voltage ranges, and thermal characteristics.