LTC2635CUD-HMI8#TRPBF

Overview

The LTC2635CUD-HMI8#TRPBF is a quad 8-bit voltage-output digital-to-analog converter (DAC) in a 16-lead QFN package. It features an integrated precision reference with a full-scale output of 4.096V and operates from a 4.5V 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 of 0.75mVP-P. Communication occurs via a 2-wire I2C-compatible interface supporting standard (100kHz) and fast (400kHz) modes. Power-on reset defaults to mid-scale in internal reference mode.

Feature Summary

• Quad 8-Bit DACs with Integrated Precision Reference
• 4.096V Full-Scale Output (LTC2635-H)
• Automotive Temperature Range (–40°C to 125°C)
• I2C-Compatible Serial Interface

Applications

• Process Control and Industrial Automation
• Power Supply Margining
• Portable Equipment

Procurement Notes

Verify the specific suffix HMI8 corresponds to the 4.096V full-scale, mid-scale power-on reset configuration for the 8-bit resolution variant. Confirm the CUD package designation matches the 16-pin QFN form factor required for the target PCB layout. Ensure the TRPBF suffix indicates lead-free tape and reel packaging suitable for automated assembly processes.

Selection Notes

Select this component when a quad-channel DAC with high accuracy and automotive reliability is required. The 8-bit resolution provides sufficient granularity for applications where cost and pin count are constraints. The 4.096V full-scale output aligns with standard ADC reference voltages. Verify that the system supply voltage remains within the 4.5V to 5.5V range specified for the H-grade devices.

Part Context

This part belongs to the LTC2635 family of quad DACs, which also offers 10-bit and 12-bit resolutions. The 'H' designation indicates the 4.096V full-scale version requiring a higher minimum supply voltage compared to the 'L' version. The 'C' grade specifies commercial temperature operation, while the datasheet guarantees performance over the extended automotive range.

Replacement Considerations

Direct replacements include other LTC2635 variants with different resolutions or reset configurations, such as LTC2635CUD-HZ8#TRPBF for zero-scale reset. Cross-family alternatives like the LTC2631 offer single-channel solutions in smaller packages but lack the quad integration.