LTC2634HUD-LMI8#PBF

Overview

The LTC2634HUD-LMI8#PBF is a quad 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features an integrated precision reference with a full-scale output of 2.5V and operates on a single 2.7V to 5.5V supply. The device includes rail-to-rail output buffers, guaranteed monotonicity over the -40°C to 125°C automotive temperature range, and low noise characteristics. Communication is handled via a 50MHz SPI/MICROWIRE compatible 3-wire serial interface. Power-on reset defaults to mid-scale in internal reference mode.

Feature Summary

• Quad 8-bit DACs with integrated 10ppm/°C precision reference
• Rail-to-rail output buffers with 2.5V full-scale range
• Automotive grade (-40°C to 125°C) with AEC-Q100 qualification
• SPI/MICROWIRE interface supporting up to 50MHz clock rates

Applications

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

Procurement Notes

Verify the specific ordering suffix LMI8 corresponds to the 8-bit resolution, mid-scale power-on reset in internal reference mode, and H-grade automotive temperature rating. Confirm package type UD (16-lead QFN) matches design requirements. Check for lead-free compliance and RoHS status as indicated by the PBF suffix.

Selection Notes

Select this part for applications requiring four independent 8-bit outputs with high accuracy and automotive reliability. Ensure supply voltage stays within 2.7V to 5.5V. Consider the external reference option if different full-scale voltages are needed, though this variant uses the internal 2.5V reference. Verify thermal management for the QFN package given the junction temperature limits.

Part Context

This component belongs to the LTC2634 family, which offers 12-, 10-, and 8-bit resolutions in both QFN and MSOP packages. The 'H' designation indicates the extended automotive temperature range, while 'L' denotes the lower voltage operation. The 'UD' suffix specifies the 16-lead QFN package format.

Replacement Considerations

Direct replacements include other LTC2634 variants with matching resolution and temperature grades, such as LTC2634HUD-LMX8#PBF (external reference mode) or LTC2634HUD-LZ8#PBF (zero-scale reset). Cross-family alternatives like the LTC2635 series offer I2C interfaces instead of SPI.