LTC2637CDE-LMI8#TRPBF

Overview

The LTC2637CDE-LMI8#TRPBF is an octal 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices Inc. It features an integrated precision reference with a temperature coefficient of 10ppm/°C, providing a full-scale output of 2.5V. The device operates on a single supply voltage ranging from 2.7V to 5.5V and communicates via a 2-wire I²C-compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. It includes double-buffered data latches and a power-on reset circuit configured to reset outputs to mid-scale in internal reference mode. The component is housed in a 14-lead 4mm × 3mm DFN package.

Feature Summary

• Octal architecture with 8 independent 8-bit DAC channels
• Integrated 10ppm/°C precision reference yielding 2.5V full-scale output
• Rail-to-rail output buffers guaranteed monotonic over the operating range
• 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 that the C suffix corresponds to the commercial temperature grade (0°C to 70°C) rather than the industrial or automotive grades. Confirm the DE package designation matches the required 14-lead DFN footprint. Ensure the LMI8 suffix correctly specifies the 2.5V internal reference, mid-scale power-on reset behavior, and 8-bit resolution for the specific design requirements.

Selection Notes

Select this part when eight low-cost, low-power voltage outputs are required within a compact surface-mount footprint. The 2.7V to 5.5V supply range accommodates both 3V and 5V system architectures. Choose the C-grade variant only if the application environment remains strictly between 0°C and 70°C; otherwise, consider the I or H grades for wider thermal tolerance.

Part Context

This component belongs to the LTC2637 family, which also offers 10-bit and 12-bit resolutions. Variants exist with different full-scale voltages (L for 2.5V, H for 4.096V), power-on reset behaviors (Z for zero-scale, MI/MX for mid-scale), and package types (MSOP). The CDE-LMI8#TRPBF specifically denotes the commercial grade, 14-lead DFN package, 2.5V reference, mid-scale reset, and 8-bit resolution configuration.

Replacement Considerations

Direct substitutes within the same family include LTC2637CDE-LZ8#TRPBF (zero-scale reset) and LTC2637CDE-MI10#TRPBF (10-bit resolution). Cross-family replacements like the LTC2636 require SPI interface compatibility verification.