AD7225KPZ

Overview

The AD7225KPZ is a monolithic LC2MOS quad 8-bit digital-to-analog converter featuring integrated output buffer amplifiers. It provides four independent voltage outputs with separate reference inputs for each channel, enabling flexible signal conditioning. The device utilizes a double-buffered parallel interface compatible with TTL and CMOS logic levels, allowing simultaneous update of all outputs via the LDAC pin. It operates from single or dual supplies, typically VDD of 11.4 V to 16.5 V and VSS of -5 V. Key performance metrics include a settling time of 4 µs to ±½ LSB, differential nonlinearity of ±1 LSB, and an input coding format of binary.

Feature Summary

• Quad 8-bit DAC architecture with individual output buffer amplifiers per channel
• Separate reference input terminals (VREFA-D) for each DAC channel
• Double-buffered parallel interface with microprocessor-compatible control logic
• Simultaneous multi-channel update capability controlled by the LDAC signal

Applications

• Programmable transversal filters requiring multiple tap weights
• Digital word multiplication circuits utilizing separate reference scaling
• Multi-channel data acquisition systems needing synchronized output updates

Procurement Notes

Verify the specific suffix 'K' against the manufacturer's current ordering guide to confirm temperature range and package variant details. Ensure that the required supply voltages and reference input ranges align with the system design constraints before procurement. Cross-reference the pinout configuration in the datasheet to validate PCB layout compatibility.

Selection Notes

Select this component when a compact solution for four independent 8-bit conversions is required without external buffering. Consider the R-2R ladder architecture and LC2MOS process for speed and linearity. Evaluate the need for separate reference inputs versus a shared reference to determine if this flexibility offers board space or performance advantages over simpler single-channel DACs.

Part Context

The AD7225 series belongs to Analog Devices' family of LC2MOS voltage-output DACs. The 'K' designation typically indicates the commercial temperature grade (-40°C to +85°C). The 'PZ' suffix denotes the 24-lead skinny PDIP package. This part integrates both the digital logic and analog conversion stages on a single chip to reduce board area.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing designs by comparing pinouts, electrical specifications, and interface logic requirements.