LTC2637CDE-LMX8#PBF

Overview

The LTC2637CDE-LMX8#PBF is an octal, 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features an integrated precision reference with a full-scale output of 2.5V and operates on a single 2.7V to 5.5V supply. The device communicates via a 2-wire I²C-compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. It includes rail-to-rail output buffers guaranteed monotonic over the temperature range. Key electrical parameters include a maximum integral nonlinearity (INL) error of ±0.5 LSB, settling time of 3.5µs at ±1LSB, and power-on reset functionality configured to mid-scale in external reference mode.

Feature Summary

• Octal architecture with 8 independent 8-bit DAC channels
• Integrated 10ppm/°C precision reference providing 2.5V full-scale output
• Rail-to-rail output buffers with ultralow crosstalk (<3nV•s)
• I²C interface with selectable slave addresses via CA0 pin

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 package type matches the 'DE' suffix for the 14-lead DFN form factor. Confirm the 'L' designation indicates the 2.5V internal reference variant and 'MX' specifies the mid-scale power-on reset behavior in external reference mode. Ensure the C-grade temperature rating (0°C to 70°C) aligns with system requirements.

Selection Notes

Select this component when multiple low-channel-count DACs are needed in a compact footprint. The 14-lead DFN package offers a small 4mm × 3mm profile suitable for space-constrained designs. Choose the L-grade version for lower supply voltage operation starting at 2.7V compared to the H-grade's 4.5V minimum.

Part Context

This part belongs to the LTC2637 family, which also includes 10-bit and 12-bit resolution variants. The family shares identical pinouts and functional blocks, differing primarily in resolution, linearity specifications, and internal reference voltage options (2.5V vs 4.096V). The CDE-LMX8#PBF specifically denotes the commercial grade, DFN package, 8-bit resolution, and mid-scale reset configuration.

Replacement Considerations

Direct substitutes within the same family include LTC2637CDE-LZ8#PBF (zero-scale reset) or LTC2637CDE-MI8#PBF (mid-scale reset in internal reference mode). For different resolutions, consider LTC2637CDE-LZ10#PBF or LTC2637CDE-LZ12#PBF, noting changes in INL and settling time specifications.