LTC2655IUF-L12#TRPBF

Overview

The LTC2655IUF-L12#TRPBF is a quad, 12-bit rail-to-rail digital-to-analog converter (DAC) from Analog Devices Inc. It features an integrated 1.25V reference, yielding a full-scale output of 2.5V. The device operates on a single supply voltage ranging from 2.7V to 5.5V and utilizes a 2-wire I²C compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. Key electrical specifications include a maximum integral nonlinearity (INL) error of ±1 LSB, a settling time of 3.9µs for 12-bit accuracy, and guaranteed monotonicity over the industrial temperature range of –40°C to +85°C.

Feature Summary

• Quad 12-bit resolution with integrated 1.25V reference providing 2.5V full-scale output
• Rail-to-rail output buffers with ultralow crosstalk (<1nV•s)
• Industrial temperature grade (–40°C to +85°C) in a 20-lead 4mm × 4mm QFN package
• Selectable power-on reset to zero-scale or mid-scale via PORSEL pin

Applications

• Mobile communications systems
• Process control and industrial automation
• Instrumentation and automatic test equipment
• Automotive applications

Procurement Notes

Verify that the ordering suffix #TRPBF corresponds to the tape and reel packaging format required for automated assembly. Confirm the specific temperature grade 'I' matches the operational environment requirements of –40°C to +85°C. Ensure the internal reference configuration ('L' for 2.5V FSR) aligns with the system's voltage headroom constraints.

Selection Notes

Select this part when four independent 12-bit DAC channels are required within a compact footprint. The integrated reference simplifies design by eliminating external precision components. Consider the 2.7V to 5.5V supply range for battery-powered or low-voltage logic systems. Verify that the I²C address pins (CA0-CA2) can be configured to avoid bus conflicts in multi-device setups.

Part Context

This component belongs to the LTC2655 family of quad DACs. Variants differ by resolution (12-bit vs 16-bit), full-scale voltage setting (2.5V vs 4.096V), and temperature grade (Commercial vs Industrial). The 'IUF' designation specifies the Industrial temperature range and the 20-lead QFN package, while '#TRPBF' indicates lead-free tape and reel packaging.

Replacement Considerations

Direct substitutes within the same package and specification include other LTC2655 variants such as LTC2655IUF-L12#PBF (tube packaging) or LTC2655CUF-L12#TRPBF (commercial temperature grade). Cross-family replacements like the LTC2657 offer octal configurations but require interface verification.