LTC2637CMS-HMI12#TRPBF

Overview

The LTC2637CMS-HMI12#TRPBF is an octal 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features a high-accuracy internal reference with a 10ppm/°C temperature coefficient, providing a full-scale output of 2.5V. The device operates on a single 2.7V to 5.5V supply and includes rail-to-rail output buffers guaranteed monotonic over the commercial temperature range of 0°C to 70°C. 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 precision reference yielding 2.5V full-scale output
• Ultralow DAC-to-DAC crosstalk specification (<3nV•s)
• Double-buffered data latches for synchronized updates

Applications

• Mobile communications systems
• Process control and industrial automation
• Automatic test equipment
• Portable battery-powered equipment
• Automotive electronics
• Optical networking infrastructure

Procurement Notes

Verify the H-grade automotive temperature rating (-40°C to 125°C) against the C-grade commercial rating (0°C to 70°C) specified in the part number suffix. Confirm the MSOP package type and tape-and-reel quantity requirements match the design specifications before ordering.

Selection Notes

Select this component when eight independent 12-bit channels are required within a compact footprint. The internal 2.5V reference simplifies design by eliminating external reference components. Ensure the application supply voltage remains within the 2.7V to 5.5V range for optimal performance and linearity.

Part Context

This part belongs to the LTC2637 family, which offers 8-, 10-, and 12-bit resolutions in both DFN and MSOP packages. Variants include L-series (2.5V FS) and H-series (4.096V FS). The CMS suffix indicates the MSOP package and Commercial temperature grade, while HMI specifies the mid-scale power-on reset behavior.

Replacement Considerations

Direct substitutes include other LTC2637 variants with matching resolution and package, such as LTC2637IMS-HMI12#TRPBF for Industrial temperature range or LTC2637CMS-LMI12#TRPBF for different reset behavior. Verify pin compatibility and electrical characteristics before substitution.

FAQ

What is the settling time for the LTC2637-12?

The typical settling time to ±1LSB for the 12-bit version is 5µs at VCC = 5V.

How is the I2C address configured?

The slave address is determined by the logic levels on the CA0, CA1, and CA2 pins, which can be tied to VCC, GND, or left floating.

What is the maximum integral nonlinearity error?

The maximum INL error for the 12-bit LTC2637 is ±2.5LSB.