AD7225KR

Overview

The AD7225KR is an Analog Devices LC2MOS quad 8-bit digital-to-analog converter (DAC) housed in a 24-lead SOIC package. It integrates four voltage-output DACs with buffer amplifiers and double-buffered interface logic on a single chip. Each channel features a separate reference input, enabling independent configuration. The device supports simultaneous updates of all outputs via the LDAC signal and operates with single or dual supplies. Key electrical parameters include a settling time of 4 µs, ±1 LSB differential nonlinearity, and power supply ranges of 11.4 V to 16.5 V for VDD and -5 V for VSS.

Feature Summary

• Quad 8-bit architecture with integrated output buffer amplifiers
• Double-buffered interface allowing simultaneous update of all four channels
• Separate reference inputs for each DAC channel
• Compatible with TTL and 5 V CMOS logic levels

Applications

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

Procurement Notes

Verify the specific suffix KR against the manufacturer's ordering guide to confirm the 24-lead SOIC package and temperature range. Ensure that the design accounts for the required VDD to VREF overhead voltage of at least 4 V for specified performance. Confirm pinout compatibility if replacing legacy components from other manufacturers.

Selection Notes

Select this component when a compact solution for four independent 8-bit conversions is required. The separate reference inputs allow for flexible gain and offset adjustments per channel. Consider the 4 µs settling time and 2 kΩ minimum load resistance requirements. Dual supply operation (-5 V VSS) is recommended for improved zero-code error and negative-going settling time compared to single-supply configurations.

Part Context

The AD7225 belongs to the AD7225 family of LC2MOS data converters. The KR suffix specifically denotes the industrial temperature range version (-40°C to +85°C) packaged in a 24-lead Small Outline Integrated Circuit (SOIC). Other variants in the series include PDIP, CERDIP, SSOP, and PLCC packages, as well as commercial temperature grade options.

Replacement Considerations

MX7225KCWG+ is a functionally similar quad 8-bit DAC from Analog Devices/Maxim Integrated. Note that the MX7225KCWG+ uses a 24-lead SOIC package but has different static accuracy specifications (±0.5 LSB INL vs ±1 LSB) and operates within a narrower supply voltage range (14.25 V to 15.75 V). Verify pinout and timing compatibility before substitution.