LTC2656IUFD-L12#TRPBF

Overview

The LTC2656IUFD-L12#TRPBF is an octal, 12-bit digital-to-analog converter (DAC) from Analog Devices. It features a precision integrated reference with a maximum temperature coefficient of 10ppm/°C and rail-to-rail output buffers guaranteed monotonic over the operating temperature range. The device operates on a single supply voltage between 2.7V and 5.5V, providing a full-scale output of 2.5V in internal reference mode. Communication is handled via a high-speed SPI/MICROWIRE compatible interface supporting clock rates up to 50MHz. It includes power-on reset capabilities and asynchronous LDAC updates.

Feature Summary

• Octal architecture with 8 independent 12-bit DAC channels
• Integrated precision reference with ±10ppm/°C max temperature coefficient
• Rail-to-rail output buffers with ultralow crosstalk (<1nV•s)
• SPI/MICROWIRE compatible serial interface with 50MHz clock rate

Applications

• Mobile Communications
• Process Control and Industrial Automation
• Instrumentation
• Automatic Test Equipment
• Automotive Systems

Procurement Notes

Verify the ordering suffix #TRPBF confirms tape and reel packaging for automated assembly. Confirm the 'I' grade designation matches the required industrial temperature range of –40°C to 85°C. Ensure the L12 suffix corresponds to the 12-bit resolution and 2.5V full-scale output specification. Cross-reference the UFD package code with the 20-lead QFN physical dimensions.

Selection Notes

Select this component when eight synchronized analog outputs are required within a compact footprint. The 12-bit resolution offers a balance between cost and performance for general-purpose applications. The integrated reference simplifies design by eliminating external components, while the wide supply range supports various system voltages. Consider the H-grade variant if a 4.096V full-scale output is necessary instead of the L-grade's 2.5V.

Part Context

This part belongs to the LTC2656 family of octal DACs, which also includes 16-bit variants and different package options like TSSOP. The IUFD-L12 specifically denotes the industrial temperature grade, QFN package, 12-bit resolution, and low-voltage reference option. It serves as a multi-channel solution for systems requiring precise voltage generation without external reference circuitry.

Replacement Considerations

Direct substitutes include other parts within the LTC2656 family such as the LTC2656IUFD-H12 for higher voltage swing or LTC2656BIUFD-L16 for increased resolution. Verify pin compatibility and software register mapping when migrating between different resolutions or package types within the same series.