LTC2637HMS-HMX8#TRPBF

Overview

The LTC2637HMS-HMX8#TRPBF is an octal 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features a high-accuracy, low-drift internal reference with a full-scale output of 4.096V and a temperature coefficient of 10ppm/°C. The device operates on a single supply voltage ranging from 4.5V to 5.5V and 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 configured to reset to mid-scale in external reference mode. The component is housed in a 16-lead MSOP package and is guaranteed monotonic over the automotive temperature range of –40°C to 125°C.

Feature Summary

• Octal 8-bit resolution with rail-to-rail output buffers
• Integrated 4.096V precision reference with 10ppm/°C drift
• I2C-compatible serial interface with selectable slave addresses
• Power-on reset to mid-scale for external reference mode

Applications

• Mobile communications
• Process control and industrial automation
• Automatic test equipment
• Portable equipment
• Automotive systems
• Optical networking

Procurement Notes

Verify the H-grade automotive temperature rating (-40°C to 125°C) and the MSOP-16 package configuration. Confirm the HMX suffix indicates power-on reset to mid-scale in external reference mode. Ensure the TRPBF suffix corresponds to tape and reel packaging. Cross-check the specific part number against official Analog Devices documentation to confirm availability and lead times.

Selection Notes

Select this part when eight independent voltage outputs are required in a compact footprint. The H-grade variant is suitable for automotive applications requiring operation up to 125°C. The HMX reset option ensures a known mid-scale state upon power-up if an external reference is used. Verify that the 4.5V to 5.5V supply range aligns with the system power architecture.

Part Context

This component belongs to the LTC2637 family of octal DACs, which also includes 10-bit and 12-bit variants. The family shares similar pinouts and interfaces but differs in resolution, linearity specifications, and supply voltage requirements based on the internal reference voltage (2.5V for L-grade, 4.096V for H-grade). The MSOP package offers a smaller form factor compared to the DFN option.

Replacement Considerations

Direct substitutes within the same family include other LTC2637 variants with different resolutions or reset configurations, such as LTC2637HMI8#TRPBF or LTC2637HZ8#TRPBF. Ensure any replacement matches the 16-lead MSOP package and the specific power-on reset behavior required by the application.