LTC2637HDE-LMX12#PBF

Overview

The LTC2637HDE-LMX12#PBF is an octal 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features an integrated precision reference with a 4.096V full-scale output and a temperature coefficient of 10ppm/°C. The device operates on a single 4.5V to 5.5V supply and 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, rail-to-rail buffered outputs, and ultralow crosstalk between channels (<3nV•s). The part is guaranteed monotonic over the –40°C to 125°C automotive temperature range.

Feature Summary

• Octal 12-bit resolution with integrated 4.096V precision reference (10ppm/°C)
• I2C-compatible serial interface with selectable internal or external reference
• Rail-to-rail output buffers guaranteed monotonic from –40°C to 125°C
• Power-on reset configurable to mid-scale in external reference mode

Applications

• Process control and industrial automation systems
• Automatic test equipment requiring multi-channel precision
• Automotive electronic control units
• Optical networking infrastructure

Procurement Notes

Verify the specific suffix 'LMX' indicates power-on reset to mid-scale in external reference mode. Confirm the 'H' grade designation for the –40°C to 125°C operating range and the 'DE' package type as a 14-lead DFN. Ensure the 4.5V to 5.5V supply requirement aligns with system design constraints.

Selection Notes

Select this component when eight independent 12-bit voltage outputs are required with high accuracy and low drift. The H-grade variant is necessary for automotive or high-temperature industrial environments. The LMX suffix is critical if the application requires outputs to settle at mid-scale upon power-up rather than zero-scale.

Part Context

This part belongs to the LTC2637 family of octal DACs, which also includes 8-bit and 10-bit variants. The family shares identical pinouts and interfaces but differs in resolution and power-on reset configurations. The H-grade specifically extends the operating temperature range compared to C and I grades.

Replacement Considerations

Direct replacements within the same family include LTC2637HDE-LZ12#PBF (zero-scale reset) or LTC2637HDE-MI12#PBF (mid-scale reset in internal reference mode). Cross-family alternatives like the LTC2635 offer quad channels instead of octal.