LTC2637HDE-HMX8#TRPBF

Overview

The LTC2637HDE-HMX8#TRPBF is an octal 8-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. It incorporates double-buffered data latches, ultralow crosstalk between DACs (<3nV•s), and a power-on reset circuit configured to reset to mid-scale in external reference mode. The component is housed in a 14-lead 4mm × 3mm DFN package.

Feature Summary

• Octal 8-bit resolution with rail-to-rail output buffers guaranteed monotonic over –40°C to 125°C
• Integrated 4.096V precision reference with ±10ppm/°C drift
• Ultralow DAC-to-DAC crosstalk (<3nV•s) and double-buffered data latches
• Power-on reset to mid-scale in external reference mode

Applications

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

Procurement Notes

Verify the specific ordering suffix HMX8 corresponds to the intended power-on reset behavior (mid-scale in external reference mode) and the 8-bit resolution. Confirm the DE package designation matches the required 14-lead DFN form factor. Ensure the TRPBF suffix indicates tape and reel packaging for automated assembly processes.

Selection Notes

Select this part when eight independent voltage outputs are required in a compact footprint. The H-grade variant supports the wider automotive temperature range up to 125°C. Choose the MX reset option if the system requires a known mid-scale state upon power-up when using an external reference source. Verify that the 4.5V minimum supply voltage aligns with the system power rails.

Part Context

This component belongs to the LTC2637 family of octal DACs, which also includes 10-bit and 12-bit variants. The family shares identical pinouts and interface protocols but differs in resolution, linearity specifications, and internal reference full-scale voltages (2.5V for L-grade vs 4.096V for H-grade). The HDE suffix specifically denotes the Automotive grade (H), Industrial temperature range, 14-lead DFN package (DE), and 8-bit resolution.

Replacement Considerations

Direct substitutes within the same family include LTC2637HDE-HMI8#TRPBF (different reset behavior) or LTC2637HDE-LZ8#TRPBF (different full-scale voltage). Cross-family replacements like the LTC2640 series offer different interfaces or channel counts and require schematic redesign.