LTC2636HMS-HMX8#PBF

Overview

The LTC2636HMS-HMX8#PBF is an octal, 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features a high-accuracy internal reference with a temperature coefficient of 10ppm/°C, providing a full-scale output of 4.096V. The device operates on a single supply voltage ranging from 4.5V to 5.5V and includes rail-to-rail output buffers that are guaranteed monotonic over the –40°C to 125°C automotive temperature range. Communication is handled via a 3-wire SPI/MICROWIRE-compatible interface supporting clock rates up to 50MHz. This specific variant incorporates power-on reset logic configured to set outputs to mid-scale when operating in external reference mode.

Feature Summary

• Octal architecture with 8 independent 8-bit DAC channels
• Integrated 10ppm/°C precision reference yielding 4.096V full-scale output
• Automotive grade reliability with guaranteed monotonicity from –40°C to 125°C
• Power-on reset to mid-scale in external reference mode (HMX suffix)

Applications

• Automotive systems requiring precise multi-channel signal generation
• Process control and industrial automation equipment
• Portable battery-powered instrumentation

Procurement Notes

Verify the H-grade designation confirms the –40°C to 125°C operating range and 4.5V minimum supply requirement. Ensure the MSOP package matches the target PCB footprint. Confirm the HMX suffix aligns with system initialization requirements for mid-scale outputs during external reference operation.

Selection Notes

Select this part when eight synchronized analog outputs are required within an automotive or harsh industrial environment. The 4.096V span suits applications interfacing directly with 5V logic or standard ADCs. Consider the HMX configuration if the application demands a known mid-scale state upon power-up rather than zero-scale.

Part Context

This component belongs to the LTC2636 family of octal DACs, which offers variations in resolution (8, 10, or 12 bits), package type (DFN or MSOP), and temperature grades. The H-grade specifically targets automotive applications, while the MSOP package provides a compact 16-lead solution with exposed thermal pads for improved heat dissipation compared to smaller packages.

Replacement Considerations

Direct replacements within the same family include LTC2636HMI-HMX8#PBF (internal reference reset) or LTC2636HZ-HMX8#PBF (zero-scale reset). For different resolutions, consider LTC2636HMX10 or LTC2636HMX12 variants, noting that linearity specifications and settling times may vary.