AD7226TQ

Overview

The AD7226TQ is a quad 8-bit voltage-output digital-to-analog converter (DAC) fabricated in LC2MOS technology. It integrates four DACs with buffered output amplifiers and interface logic on a single chip, requiring no external trims. The device features separate latches for each channel, controlled via a common 8-bit TTL/CMOS-compatible input port using address lines A0, A1, and WR. It supports dual supply operation (VDD: 11.4 V to 16.5 V; VSS: -5 V) or single supply operation (VDD: 14.25 V to 15.75 V). Key static performance metrics include ±0.5 LSB relative accuracy, ±1 LSB differential nonlinearity, and a settling time of 4 µs maximum.

Feature Summary

• Four independent 8-bit DACs with laser-trimmed output buffer amplifiers capable of driving up to 5 mA.
• Microprocessor-compatible parallel interface with individual data latches and TTL/CMOS logic levels.
• Skinny 20-lead package options including DIP, SOIC, SSOP, and PLCC for compact board layout.
• Extended temperature range operation from -40°C to +85°C.

Applications

• Process control systems
• Automatic test equipment
• Automatic calibration of large system parameters such as gain and offset

Procurement Notes

Verify the specific package variant corresponding to the 'TQ' suffix against the manufacturer's official documentation, as standard listings often reference K or B versions in DIP/SOIC packages. Confirm RoHS compliance status for the specific manufacturing lot, as historical data indicates variations between leaded and lead-free versions within the AD7226 family. Ensure supply chain sources provide valid datasheets matching the exact part number to avoid pinout or electrical specification mismatches.

Selection Notes

Select the AD7226TQ when multiple synchronized 8-bit voltage outputs are required in a space-constrained design. The integrated buffering eliminates the need for external op-amps, reducing component count. Ensure the application can accommodate the specified power supply ranges and that the 4 µs settling time meets the system's dynamic requirements. Verify that the digital interface logic aligns with the microprocessor's timing constraints for the write cycle.

Part Context

The AD7226 belongs to Analog Devices' LC2MOS family of high-speed precision analog devices. This process technology allows the integration of high-speed digital logic and precision analog circuits on the same monolithic chip. The quad configuration provides inherent channel-to-channel matching due to simultaneous fabrication, ensuring precise tracking between converters without external trimming.

Replacement Considerations

Direct replacements within the same family include the AD7226K and AD7226B variants, which share identical electrical specifications but may differ in package type or environmental certification. Other multi-channel DACs from Analog Devices should be evaluated for pin compatibility and performance overlap if the AD7226TQ is unavailable.