AD7224LPZ-REEL

Overview

The AD7224 is a monolithic 8-bit voltage-output digital-to-analog converter featuring an integrated output amplifier and double-buffered interface logic. Fabricated using Linear Compatible CMOS (LC2MOS) technology, it operates with single or dual power supplies. Key electrical specifications include a total unadjusted error of ±1 LSB for the 'L' version and ±2 LSB for the 'K' version over temperature. The device supports reference voltages from +2 V to +12.5 V, with settling times of 5 µs (positive) and 7 µs (negative) to ±1/2 LSB under dual supply conditions.

Feature Summary

• Integrated LC2MOS 8-bit DAC and unity-gain output amplifier on a single chip
• Double-buffered interface allowing simultaneous updates in multi-DAC systems
• Low total unadjusted error (<1 LSB over temperature for L-version)
• Compatible with TTL and 5V CMOS logic levels

Applications

• Microprocessor-controlled data acquisition systems
• Programmable gain amplifiers
• Variable voltage references
• Waveform generation circuits

Procurement Notes

Verify the specific suffix against the Ordering Guide to confirm package type and temperature range. The '-REEL' suffix indicates tape-and-reel packaging, distinct from tube packages like N-18 or R-20. Ensure the selected variant matches the required operating temperature range, as K/L versions differ from B/C/T/U versions in thermal specifications.

Selection Notes

Select the 'L' suffix for tighter accuracy specifications (±1 LSB total unadjusted error) compared to the 'K' suffix (±2 LSB). Choose the package based on board space: SOIC (R), PLCC (P), or DIP (N/Q). Verify that the system power supply allows for the required VDD-VREF differential of at least 4 V for specified performance.

Part Context

The AD7224 belongs to Analog Devices' family of precision CMOS DACs. It is functionally similar to the AD7225 but offers different pin counts and integration levels. The device utilizes an R-2R ladder architecture with NMOS switches, designed for high-speed operation and low power consumption typical of LC2MOS processes.

Replacement Considerations

Direct pin-compatible replacements within the same series include AD7224KR-1Z (SOIC-18) or AD7224LPZ (PLCC-20) depending on the desired package and accuracy grade. Cross-series replacement with AD7225 requires schematic modification due to pinout differences.