LTC2635HUD-HZ8#PBF

Overview

The LTC2635HUD-HZ8#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 4.096V and operates from a single 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 communicates via a 2-wire I²C-compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. It incorporates a power-on reset circuit for zero-scale initialization.

Feature Summary

• Quad 8-Bit Resolution with Integrated 4.096V Reference
• Automotive Temperature Range (–40°C to 125°C)
• Rail-to-Rail Output Buffers with Guaranteed Monotonicity
• I²C Interface with Power-On Reset to Zero-Scale

Applications

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

Procurement Notes

Verify the specific ordering suffixes against official documentation to confirm package type, temperature grade, and power-on reset behavior. Ensure compatibility with system voltage requirements, as the H-grade variant requires a minimum supply of 4.5V. Confirm lead-free status and RoHS compliance through manufacturer datasheets or authorized distributor specifications.

Selection Notes

Select this component when four independent 8-bit DAC channels are required in a compact footprint. The H-grade designation indicates a 4.096V full-scale output suitable for 5V systems. The Z suffix specifies a power-on reset to zero-scale. Consider the 16-pin QFN package for space-constrained designs requiring soldered exposed pad grounding.

Part Context

This part belongs to the LTC2635 family of quad DACs, which also offers 10-bit and 12-bit resolutions. The family shares common architectural features such as low crosstalk (3nV•s), double-buffered data latches, and selectable internal or external reference inputs. The H-grade variants are optimized for higher voltage operation compared to the L-grade parts.

Replacement Considerations

Direct replacements within the same family include other LTC2635 variants with different resolutions (LTC2635H...10, LTC2635H...12) or reset behaviors (e.g., LTC2635HMI...). Verify pinout compatibility and ensure the replacement supports the required I²C clock speeds and supply voltage range.