LTC2637HDE-LMX8#TRPBF

Overview

The LTC2637HDE-LMX8#TRPBF is an octal 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features a high-accuracy internal reference with a 10ppm/°C temperature coefficient, providing a full-scale output of 4.096V. 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 includes 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 14-lead DFN package.

Feature Summary

• Octal 8-bit resolution with rail-to-rail buffered outputs
• Integrated 4.096V precision reference with ±10ppm/°C drift
• I2C interface with selectable slave addresses via CA0 pin
• Power-on reset to mid-scale for external reference configurations

Applications

• Mobile communications systems
• Process control and industrial automation
• Automatic test equipment
• Portable battery-powered equipment
• Automotive electronics
• Optical networking devices

Procurement Notes

Verify the specific ordering suffix LMX8 corresponds to the required power-on reset behavior (mid-scale in external reference mode) and the H-grade automotive temperature range (-40°C to 125°C). Confirm the DE package designation matches the 14-lead DFN requirement for the target PCB layout. Ensure the I2C address configuration pins are correctly terminated according to system addressing needs.

Selection Notes

Select this part when an octal DAC with low channel count and high accuracy is needed. The H-grade variant supports wider temperature ranges suitable for automotive applications. The LMX suffix indicates mid-scale reset in external reference mode; choose LZ for zero-scale or MI for mid-scale in internal reference mode if those behaviors are preferred. Verify supply voltage compatibility, as the H-grade requires 4.5V minimum.

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 architectural features but differs in resolution, linearity specifications, and settling times. The H-grade designation specifically denotes the automotive temperature rating and higher full-scale voltage capability compared to the commercial C-grade or industrial I-grade versions.

Replacement Considerations

Direct replacements within the same family include LTC2637HDE-MI8#TRPBF (internal reference reset) or LTC2637HDE-Z8#TRPBF (zero-scale reset). For different resolutions, consider LTC2637HDE-LMX10#TRPBF or LTC2637HDE-LMX12#TRPBF, noting changes in INL/DNL performance and settling time.