LTC2656CUFD-L12#PBF

Overview

The LTC2656CUFD-L12#PBF is an octal, 12-bit digital-to-analog converter (DAC) featuring a precision integrated reference. It operates on a single 2.7V to 5.5V supply and provides rail-to-rail output buffers with guaranteed monotonicity over temperature. The device utilizes a 4-wire SPI/MICROWIRE compatible serial interface supporting clock rates up to 50MHz. Key specifications include a maximum integral nonlinearity (INL) of ±1 LSB, a settling time of 4.2µs for 12-bit accuracy, and ultralow DAC-to-DAC crosstalk below 1nV•s. The part is housed in a compact 20-lead 4mm × 5mm QFN package.

Feature Summary

• Octal architecture with 8 independent 12-bit channels
• Integrated 1.25V precision reference with ±10ppm/°C max temperature coefficient
• Rail-to-rail output buffers with <1nV•s crosstalk
• SPI/MICROWIRE compatible 4-wire serial interface

Applications

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

Procurement Notes

Verify the specific ordering suffix L12 confirms the 12-bit resolution and 2.5V full-scale internal reference configuration. Confirm the C-grade designation indicates the commercial temperature range of 0°C to 70°C. Ensure the UFD package type matches the required 20-lead 4mm × 5mm QFN footprint for the design.

Selection Notes

Select this component when eight isolated voltage outputs are required within a limited board area. The integrated reference simplifies design by eliminating external precision components. Verify that the 2.7V minimum supply voltage aligns with the system power rails. Consider the ±1 LSB INL specification against application linearity requirements.

Part Context

This part belongs to the LTC2656 family of octal DACs. Variants exist with 16-bit resolution or different full-scale voltages (e.g., H-series for 4.096V). The CUFD suffix specifically denotes the Commercial grade temperature range and the QFN package style, distinguishing it from Industrial grade or TSSOP package options.

Replacement Considerations

Direct pin-compatible replacements within the same family include other LTC2656 variants with different resolutions or temperature grades. Cross-family replacement requires verification of interface compatibility and pinout alignment.