LTC2635HUD-LZ8#PBF

Overview

The LTC2635HUD-LZ8#PBF is a quad 8-bit voltage-output digital-to-analog converter (DAC) featuring an integrated precision reference with a temperature coefficient of 10ppm/°C. 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 automotive temperature range of –40°C to 125°C. Communication is handled via a 2-wire I²C-compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. It incorporates a power-on reset circuit that defaults outputs to zero-scale.

Feature Summary

• Quad 8-Bit Architecture: Four independent DAC channels in a single package.
• Integrated Precision Reference: Internal 4.096V full-scale output with ±10ppm/°C drift.
• Automotive Grade: Guaranteed monotonic operation from –40°C to 125°C.
• I²C Interface: Compatible with standard and fast mode clock rates up to 400kHz.

Applications

• Process Control and Industrial Automation
• Power Supply Margining
• Automotive Systems

Procurement Notes

Verify the specific suffixes against the manufacturer's ordering guide to confirm package type (UD for QFN or MSE for MSOP), resolution, and power-on reset behavior. Ensure the H-grade designation matches the required 4.5V minimum supply voltage and automotive temperature range specifications for the target application environment.

Selection Notes

Select this component when four independent 8-bit DACs are required with high accuracy and low drift. The H-grade variant is necessary for applications requiring a 4.096V full-scale range and operation within the –40°C to 125°C temperature envelope. Verify that the system supply voltage remains between 4.5V and 5.5V to meet electrical specifications.

Part Context

This part belongs to the LTC2635 family of quad DACs, which also offers 10-bit and 12-bit resolutions. The 'L' grade variants support lower supply voltages (2.7V–5.5V) with a 2.5V full-scale output, whereas the 'H' grade is optimized for 4.5V–5.5V supplies with a 4.096V full-scale output. The 'HUD' indicates the specific package and temperature grade combination.

Replacement Considerations

Direct substitutes within the same family include other LTC2635 variants with different resolutions (e.g., LTC2635HUZ10#PBF for 10-bit) or reset behaviors. Cross-family replacements require matching I²C compatibility, channel count, and output voltage ranges.