LTC2637HDE-LMI12#PBF

Overview

The LTC2637HDE-LMI12#PBF is an octal 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features an integrated precision reference providing a 4.096V full-scale output, operating within a 4.5V to 5.5V supply range. The device communicates via a 2-wire I2C-compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. Key electrical specifications include a maximum integral nonlinearity (INL) error of ±2.5 LSB, a settling time of 5µs at ±1LSB, and ultralow DAC-to-DAC crosstalk below 3nV•s. It incorporates double-buffered data latches and a power-on reset circuit configured to initialize outputs to mid-scale in internal reference mode.

Feature Summary

• Octal architecture with 12-bit resolution and rail-to-rail output buffers
• Integrated 4.096V precision reference with ±10ppm/°C temperature coefficient
• Ultralow crosstalk between channels (<3nV•s)
• Power-on reset to mid-scale in internal reference mode

Applications

• Process control and industrial automation systems
• Automatic test equipment requiring multi-channel signal generation
• Portable battery-powered instrumentation
• Automotive electronic control units

Procurement Notes

Verify the H-grade suffix indicates automotive temperature qualification (-40°C to 125°C). Confirm the DE package designation corresponds to the 14-lead DFN form factor. Ensure the LMI12 suffix matches the required mid-scale power-on reset behavior for internal reference applications. Cross-check lead-free compliance markings against current manufacturing standards.

Selection Notes

Select this part when eight independent 12-bit voltage outputs are required in a compact footprint. The H-grade variant is necessary for environments exceeding 85°C. Compare settling times and INL specifications against system accuracy requirements. Consider the 4.5V minimum supply constraint versus available board power rails. Evaluate the I2C address configuration options using CA0, CA1, and CA2 pins for bus multiplexing.

Part Context

This component belongs to the LTC2637 family, which includes variants with different resolutions (8-, 10-, 12-bit), reference voltages (2.5V or 4.096V), and temperature grades (Commercial, Industrial, Automotive). The specific HDE-LMI12 designation combines the automotive grade, DFN package, mid-scale reset option, and 12-bit resolution within the octal DAC lineup.

Replacement Considerations

Direct substitutes within the same family include LTC2637HMS-LMI12#PBF for MSOP packaging or LTC2637HDE-LZ12#PBF for zero-scale reset behavior. Verify pin compatibility and electrical parameter alignment before substitution.