LTC2637CMS-LMI12#PBF

Overview

The LTC2637CMS-LMI12#PBF is an octal 12-bit voltage-output digital-to-analog converter 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 includes rail-to-rail output buffers guaranteed monotonic over the –40°C to 85°C industrial temperature range. Communication is handled via a 2-wire I2C-compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. Power-on reset defaults to mid-scale in internal reference mode.

Feature Summary

• Octal 12-bit resolution with maximum INL error of ±2.5LSB
• Integrated 4.096V full-scale reference with ±10ppm/°C drift
• Rail-to-rail output buffers with ultralow DAC-to-DAC crosstalk (<3nV•s)
• Double-buffered data latches for glitch-free updates

Applications

• Process control and industrial automation systems
• Automatic test equipment requiring multi-channel precision
• Portable battery-powered instrumentation
• Automotive electronic control units

Procurement Notes

Verify the specific suffix LMI12 corresponds to the 12-bit resolution, mid-scale power-on reset, and MSOP package configuration. Confirm the C-grade designation matches the required commercial operating temperature range of 0°C to 70°C against system thermal constraints. Ensure I2C address pins CA0-CA2 are correctly terminated to avoid bus conflicts.

Selection Notes

Select this part when eight independent 12-bit channels are required within a compact footprint. The internal reference simplifies design by eliminating external precision components. Verify that the 4.5V minimum supply voltage aligns with the system power rails, as the -L variant supports lower voltages if needed. Consider the MSOP package thermal resistance for current drive capabilities under load.

Part Context

This component belongs to the LTC2637 family, which offers 12-, 10-, and 8-bit resolutions in both DFN and MSOP packages. The CMS designation indicates the MSOP package form factor, while LMI specifies the 12-bit resolution and mid-scale reset behavior. The #PBF suffix denotes lead-free construction compliant with RoHS standards.

Replacement Considerations

Direct functional equivalents within the same family include LTC2637IMS-LMI12#PBF for identical electrical performance in an MSOP package, or LTC2637CDE-LMI12#PBF for a smaller 14-lead DFN footprint. Cross-model substitution requires verifying pin compatibility and ensuring the replacement maintains the 12-bit resolution and I2C interface requirements.