LTC2634HUD-LMI12#PBF

Overview

The LTC2634HUD-LMI12#PBF is a quad 12-bit voltage output digital-to-analog converter (DAC) featuring an integrated precision reference with 10ppm/°C drift. It operates from a single 4.5V to 5.5V supply, providing a full-scale output of 4.096V. The device includes rail-to-rail output buffers and is guaranteed monotonic over the –40°C to 125°C automotive temperature range. Communication is handled via a 50MHz SPI/MICROWIRE compatible 3-wire serial interface. Upon power-up, the outputs reset to mid-scale in internal reference mode. The component is housed in a 16-lead 3mm × 3mm QFN package.

Feature Summary

• Quad 12-bit resolution with ±2.5 LSB maximum integral nonlinearity error
• Integrated 4.096V full-scale reference with 10ppm/°C temperature coefficient
• Automotive grade qualification (AEC-Q100) for –40°C to 125°C operation
• Power-on reset to mid-scale in internal reference mode

Applications

• Mobile communications
• Process control and industrial automation
• Automatic test equipment
• Portable equipment
• Automotive systems

Procurement Notes

Verify that the specific part number corresponds to the H-grade automotive temperature range and the L suffix indicating the 4.096V full-scale output. Confirm the MI suffix denotes the mid-scale power-on reset behavior in internal reference mode. Ensure the #PBF suffix indicates lead-free compliance. Cross-reference the datasheet revision E specifications for settling time and linearity guarantees.

Selection Notes

Select this model when a 12-bit resolution with high accuracy is required for automotive applications operating between –40°C and 125°C. The 4.096V full-scale range suits interfaces requiring higher dynamic range than 2.5V systems. The mid-scale power-on reset is suitable for downstream circuits sensitive to zero-scale transients during initialization. Ensure the system supply voltage remains within the 4.5V to 5.5V range for specified performance.

Part Context

This component belongs to the LTC2634 family of quad DACs, which also offers 8-bit and 10-bit resolutions. Variants exist with 2.5V full-scale outputs (L suffix) and different power-on reset behaviors (Z for zero-scale, MX for external reference mid-scale). The HUD designation specifically identifies the 12-bit resolution, H-grade temperature rating, and QFN package type within this product line.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.