AD7225LNZ

Overview

The AD7225LNZ is a monolithic LC2MOS quad 8-bit voltage-output digital-to-analog converter (DAC) featuring integrated output buffer amplifiers. It provides four independent channels, each with a separate reference input terminal to allow flexible signal conditioning. The device utilizes a double-buffered interface logic consisting of input and DAC registers per channel, enabling simultaneous update of all four outputs via the LDAC pin. It operates with single or dual supplies, supporting TTL and CMOS logic levels. Key static performance metrics include a total unadjusted error of ±1 LSB (L/C versions) and a settling time of 4 μs max.

Feature Summary

• Quad 8-bit DAC architecture with individual output buffer amplifiers
• Separate reference input for each DAC channel
• Double-buffered interface allowing simultaneous multi-channel updates
• TTL/CMOS compatible digital inputs with 5 V level compatibility

Applications

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

Procurement Notes

Verify the suffix 'LNZ' against the manufacturer's ordering guide to confirm package type and temperature range specifications. Ensure the supply voltage configuration matches the required performance parameters, as single-supply operation may affect sink capability and settling times near ground.

Selection Notes

Select this component when multiple independent 8-bit voltage outputs are required on a single chip. The L/C version offers improved total unadjusted error (±1 LSB) compared to K/B versions. Consider dual-supply operation if negative-going settling time and zero-code error performance are critical, as single-supply mode reduces sink current capability near AGND.

Part Context

The AD7225 is fabricated using Analog Devices' LC2MOS process, integrating high-speed digital logic with precision analog circuitry. It replaces discrete DAC and amplifier combinations, reducing board space. The device is part of the broader AD722x family, differentiated by resolution and channel count, offering a versatile solution for mixed-signal applications requiring synchronized output updates.

Replacement Considerations

Direct pin-compatible replacements within the same family include the AD7224 (quad 6-bit) or AD7226 (quad 10-bit), though resolution differs. For higher resolution needs, consider the AD7376 series. Verify that any substitute maintains the required 8-bit resolution and simultaneous update capability.