AD7225LR

Overview

The AD7225LR is a monolithic LC2MOS quad 8-bit digital-to-analog converter featuring integrated output buffer amplifiers and double-buffered interface logic. It supports simultaneous update of all four channels via a common LDAC signal. The device operates with single or dual supplies, requiring VDD from 11.4 V to 16.5 V and VSS at -5 V for specified performance. Each DAC has a separate reference input (2 V to VDD-4 V). Key static parameters include ±1 LSB total unadjusted error and ±1/2 LSB relative accuracy for L/C versions. Dynamic performance includes a 4 μs settling time to ±½ LSB and 2.5 V/μs slew rate.

Feature Summary

• Four independent 8-bit voltage-output DACs with unity-gain buffer amplifiers on a single chip
• Double-buffered interface allowing simultaneous update of all outputs via LDAC control
• Separate reference input for each channel supporting variable voltage ranges
• TTL and CMOS compatible digital inputs with microprocessor-compatible addressing

Applications

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

Procurement Notes

Verify the specific package type associated with the LR suffix against the manufacturer's ordering guide, as the datasheet lists Skinny 24-lead PDIP, CERDIP, SOIC, SSOP, and 28-lead PLCC options. Confirm temperature range compliance, noting that K/L versions cover -40°C to +85°C. Ensure supply voltages match the dual-supply requirement (VDD 11.4–16.5 V, VSS -5 V) for optimal specification adherence.

Selection Notes

Select the AD7225LR when four isolated 8-bit DACs with individual reference inputs are required in a compact footprint. Choose this component over higher-resolution alternatives if 8-bit precision suffices for the application. Consider the L/C version specifications for tighter accuracy tolerances (±1/2 LSB relative accuracy) compared to K/B versions. Ensure the system can provide the necessary overhead voltage (VDD - VREF >= 4 V) for the output buffers.

Part Context

The AD7225 belongs to Analog Devices' LC2MOS family of high-speed linear-compatible CMOS data converters. This process technology integrates high-speed digital logic with precision analog circuitry on a single die. The quad configuration reduces board space compared to discrete solutions, optimizing layout by separating analog inputs/outputs from digital inputs.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.