AD7225BQ

Overview

The AD7225BQ is a monolithic CMOS quad 8-bit digital-to-analog converter (DAC) featuring integrated voltage-output buffer amplifiers. It operates with VDD ranging from 11.4 V to 16.5 V and VSS at -5 V, or as a single 15 V supply. Each of the four channels has a separate reference input supporting voltages from 2 V to (VDD − 4 V). The device utilizes double-buffered inputs for simultaneous update control via LDAC. Static performance includes ±1 LSB relative accuracy and ±1 LSB differential nonlinearity for L/C versions, with a settling time of 4 μs max.

Feature Summary

• Quad 8-bit DAC architecture with individual buffered voltage outputs
• Separate reference input per channel allowing independent scaling
• Double-buffered interface logic enabling simultaneous multi-channel updates
• LC2MOS fabrication process for high-speed digital and precision analog integration

Applications

• Programmable transversal filters
• Digital word multiplication circuits
• Microprocessor-controlled analog signal generation

Procurement Notes

Verify the specific suffix 'BQ' against the manufacturer's ordering guide to confirm package type and temperature range. The datasheet lists K, B, L, and C versions with distinct static performance tolerances. Ensure the component matches the required industrial or commercial grade specifications before procurement.

Selection Notes

Select based on required accuracy; L/C versions offer ±1 LSB total unadjusted error compared to ±2 LSB for K/B versions. Confirm power supply configuration, as dual supplies (-5 V/VDD) improve zero-code error and sink capability. Verify that the reference voltage range fits within the (VDD − 4 V) limit to maintain specified performance.

Part Context

The AD7225 is part of Analog Devices' LC2MOS family, designed to integrate high-speed logic with precision analog circuitry. It replaces older bipolar DAC technologies by offering reduced board space and increased reliability through its monolithic CMOS design. The device supports both single and dual supply operations for flexible system integration.

Replacement Considerations

Direct substitutes include other quad 8-bit DACs with similar pinouts and reference configurations. Verify compatibility regarding the double-buffered interface timing and output drive capabilities. Check if alternative packages (SOIC, SSOP, PLCC) are available if the PDIP/CERDIP form factor is not strictly required.