AD7225BRS-REEL

Overview

The AD7225BRS-REEL is a quad 8-bit digital-to-analog converter (DAC) manufactured by Analog Devices Inc. It integrates four voltage-output DACs with buffer amplifiers and interface logic on a single LC2MOS CMOS chip. The device features separate reference inputs for each channel, allowing independent configuration. It utilizes a double-buffered parallel interface compatible with TTL and 5V CMOS levels, enabling simultaneous update of all four outputs via the LDAC signal. Electrical specifications include a settling time of 4 µs to ±1/2 LSB, a resolution of 8 bits, and operation within a supply voltage range of 11.4 V to 16.5 V for VDD and -5 V for VSS. The component operates over an extended temperature range from -40°C to +85°C.

Feature Summary

• Quad 8-bit architecture with integrated output buffer amplifiers
• Separate reference input terminals for each DAC channel
• Double-buffered parallel interface supporting simultaneous multi-channel updates
• LC2MOS fabrication process ensuring high speed and linearity

Applications

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

Procurement Notes

Verify the B suffix indicates industrial temperature grade (-40°C to +85°C) and the RS-REEL suffix denotes tape and reel packaging. Confirm RoHS compliance status as Rev C datasheet does not explicitly list REACH or specific lead-free certifications in the provided text. Ensure ordering documentation matches the specific package variant required, as the AD7225 family includes multiple physical footprints.

Selection Notes

Select this component when four independent 8-bit voltage outputs are required with minimal board space. The dual-supply requirement (VDD positive, VSS negative) must be accommodated in the power design. For single-supply applications, verify that the reduced sink capability near AGND meets system requirements. Ensure the reference voltage source can drive the code-dependent input impedance without degradation.

Part Context

The AD7225 belongs to the Analog Devices LC2MOS family of monolithic DACs. This series combines high-speed digital logic with precision analog circuitry on a single chip. The AD7225 specifically addresses applications requiring multiple synchronized analog outputs, such as waveform generation or multi-channel control systems, leveraging its internal double-buffering for glitch-free updates.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Cross-referencing requires matching the quad 8-bit specification, parallel interface, and supply voltage ranges.