LTC2635HUD-LMI12#PBF

Overview

The LTC2635HUD-LMI12#PBF is a quad 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices, housed in a 16-lead QFN package. It features an integrated precision reference with a full-scale output of 2.5V and a temperature coefficient of 10ppm/°C. The device operates on a single supply ranging from 4.5V to 5.5V and communicates via a 2-wire I²C-compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. Key electrical specifications include a maximum integral nonlinearity error of ±2.5 LSB, rail-to-rail buffered outputs, and guaranteed monotonicity over the automotive temperature range of –40°C to 125°C.

Feature Summary

• Quad 12-bit resolution with integrated 2.5V precision reference (10ppm/°C drift)
• I²C-compatible serial interface with selectable internal or external reference
• Power-on reset options including mid-scale, zero-scale, or high-impedance states
• Ultralow crosstalk between DACs (3nV•s) and low power consumption (0.7mA at 5V)

Applications

• Process control and industrial automation systems
• Portable equipment requiring low power and small form factor
• Automotive electronics operating in harsh thermal environments
• Power supply margining applications

Procurement Notes

Verify the specific suffix 'HUD' against the manufacturer's official documentation to confirm the exact package type and temperature grade, as datasheet ordering information lists 'UD' for QFN and 'MSE' for MSOP packages. Ensure the component matches the required automotive temperature range (-40°C to 125°C) specified by the 'H' grade. Cross-reference the '#PBF' lead-free designation with current manufacturing standards.

Selection Notes

Select this part when four independent 12-bit channels are required with tight linearity constraints (±2.5 LSB INL). The internal 2.5V reference simplifies design by eliminating external components, provided the system supply voltage falls within the 4.5V to 5.5V range. Consider the external reference option if a different full-scale voltage is needed, noting that the REF pin serves as both input and output depending on configuration.

Part Context

This component belongs to the LTC2635 family, which includes 8-bit, 10-bit, and 12-bit variants. The 'L' suffix denotes a 2.5V full-scale output compatible with 2.7V supplies, while the 'H' suffix indicates a 4.096V full-scale output requiring 4.5V minimum supply. The 'HUD' prefix specifically identifies the Automotive grade (H), QFN package (UD), and Mid-Scale reset configuration (MI).

Replacement Considerations

Direct replacements within the same family include LTC2635UD-HMI12#PBF for identical functionality in the QFN package. For MSOP packaging, consider LTC2635MSE-HMI12#PBF. Verify that any substitute maintains the 12-bit resolution, I²C interface compatibility, and automotive temperature rating.