LTC2637IMS-LMX10#PBF

Overview

The LTC2637IMS-LMX10#PBF is an octal 10-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features a selectable internal or external reference, with the 'L' suffix indicating a 2.5V full-scale output range when using the internal reference. The device operates on a single 2.7V 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 and a power-on reset circuit configured to reset to mid-scale in external reference mode. The component is housed in a 16-lead MSOP package.

Feature Summary

• Octal architecture providing eight independent 10-bit DAC channels
• I2C-compatible serial interface with selectable slave addresses via CA0, CA1, and CA2 pins
• Power-on reset function set to mid-scale for external reference configurations
• Rail-to-rail output buffers guaranteed monotonic over temperature

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 specific ordering suffix LMX10 corresponds to the 10-bit resolution, external reference mode selection, and mid-scale power-on reset behavior as defined in the manufacturer's order information table. Confirm the MSOP package type matches the design requirements. Ensure the supply voltage range of 2.7V to 5.5V aligns with the system power architecture.

Selection Notes

Select this part when eight low-power, high-accuracy voltage outputs are required in a compact footprint. The external reference option allows flexibility in setting the full-scale output voltage independently of the internal 2.5V reference. Consider the 10-bit resolution versus 8-bit or 12-bit variants based on linearity requirements and cost constraints. Verify that the I2C bus speed supports the system's update rate needs.

Part Context

This component belongs to the LTC2637 family of octal DACs, which also includes 8-bit and 12-bit resolutions. Variants within the family differ by power-on reset behavior (zero-scale vs. mid-scale) and reference configuration (internal vs. external). The IMS designation indicates the 16-lead MSOP package, while the H-grade variant supports higher temperatures up to 125°C compared to the standard I-grade range.

Replacement Considerations

Direct substitutes include other LTC2637 variants with different resolutions (LTC2637IMS-LMZ8#PBF or LTC2637IMS-LMZ12#PBF) if bit-depth adjustments are acceptable. For external reference applications with zero-scale reset, consider the LTCZ series. Cross-model compatibility requires verifying pinout consistency and I2C address configurations.