LTC2637HDE-LMX12#TRPBF

Overview

The LTC2637HDE-LMX12#TRPBF is an octal 12-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 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, a settling time of 5µs at ±1LSB, and ultralow DAC-to-DAC crosstalk below 3nV•s. The part incorporates double-buffered data latches and a power-on reset circuit configured to reset to mid-scale in external reference mode.

Feature Summary

• Octal architecture with 8 independent 12-bit voltage outputs
• Integrated 4.096V precision reference with 10ppm/°C drift
• I2C interface with selectable slave addresses via CA0-CA2 pins
• Power-on reset to mid-scale for external reference configurations

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 specific ordering suffix LMX against the manufacturer's documentation to confirm the power-on reset behavior. The LMX suffix indicates a reset to mid-scale when operating in external reference mode, which differs from other variants like LZ or LMI. Ensure the design supports the required 4.5V minimum supply voltage for the H-grade device.

Selection Notes

Select this component when eight synchronized voltage channels are required with high linearity and low noise. The H-grade variant is necessary for applications demanding a 4.096V full-scale range. Verify that the system power supply remains within the 4.5V to 5.5V window to maintain specified performance parameters across the -40°C to 125°C automotive temperature range.

Part Context

This part belongs to the LTC2637 family of octal DACs, available in 12-, 10-, and 8-bit resolutions. The HDE designation identifies it as an Automotive grade (H) device in a 14-lead DFN package (DE). Other family members include the C and I grades for commercial and industrial temperatures, and MSOP packages for alternative form factors.

Replacement Considerations

Direct pin-compatible replacements within the same package include other LTC2637 variants such as LTC2637HDE-HZ12#TRPBF or LTC2637HDE-LZ12#TRPBF, provided the power-on reset requirements match the application needs. Cross-family replacements require careful evaluation of interface protocols and pinouts.