LTC2637HMS-LZ12#PBF

Overview

The LTC2637HMS-LZ12#PBF is an octal 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices Inc. It features an integrated precision reference with a full-scale output of 4.096V and a temperature coefficient of 10ppm/°C. Designed for automotive applications, it operates within a supply voltage range of 4.5V to 5.5V. The device communicates via a 2-wire I2C-compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. It incorporates double-buffered data latches and a power-on reset circuit that defaults outputs to zero-scale in internal reference mode.

Feature Summary

• Octal architecture providing eight independent 12-bit DAC channels
• Integrated 4.096V reference with ±10ppm/°C temperature stability
• Automotive grade reliability rated for –40°C to 125°C operating range
• Rail-to-rail buffered outputs with guaranteed monotonicity

Applications

• Automotive systems requiring multi-channel signal generation
• Process control and industrial automation equipment
• Automatic test equipment utilizing precise voltage references
• Optical networking infrastructure components

Procurement Notes

Verify the specific H-grade suffix indicates the automotive temperature range and 4.096V full-scale requirement. Confirm the MS package designation matches the 16-lead MSOP physical footprint. Ensure the LZ12 suffix aligns with the 12-bit resolution and zero-scale power-on reset configuration required by the design.

Selection Notes

Select this part when eight isolated voltage outputs are necessary within a single component. The H-grade variant is mandatory for environments exceeding 85°C or meeting automotive standards. Verify that the 4.5V minimum supply voltage accommodates the system's power rails, as lower voltage operation is not supported by this specific grade.

Part Context

This component belongs to the LTC2637 family, which includes L-grade variants for general-purpose use at 2.7V–5.5V. The H-grade specifically targets high-reliability sectors like automotive electronics. The MSOP package offers a compact surface-mount solution compared to the DFN option, facilitating integration into space-constrained printed circuit boards.

Replacement Considerations

Direct substitutes include other LTC2637 variants such as the LTC2637IMS-LZ12#PBF for industrial temperature ranges or the LTC2637IDE-LZ12#PBF for DFN packaging. Cross-model replacements require verifying pin compatibility and ensuring the replacement supports the required 4.5V minimum supply voltage.