LTC2637IMS-LMX8#TRPBF

Overview

The LTC2637IMS-LMX8#TRPBF is an octal 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features a 16-lead MSOP package and operates on a single 2.7V to 5.5V supply. The device utilizes an external reference input, setting the full-scale output voltage equal to the REF pin voltage. It communicates via a 2-wire I2C-compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. Key electrical specifications include a maximum integral nonlinearity (INL) of ±0.5 LSB, a settling time of 3.5µs at 3V, and a typical supply current of 0.8mA.

Feature Summary

• Octal architecture with 8 independent 8-bit DAC channels
• External reference mode allows full-scale output to match the REF pin voltage
• Power-on reset configured to initialize outputs to mid-scale code
• Ultralow crosstalk between DACs (<3nV•s) and rail-to-rail output buffers

Applications

• Mobile communications systems
• Process control and industrial automation
• Automatic test equipment
• Portable instrumentation
• Automotive electronics

Procurement Notes

Verify that the specific suffix LMX8 corresponds to the required external reference configuration and mid-scale power-on reset behavior. Confirm the MSOP package availability matches the design footprint requirements. Ensure the operating temperature range aligns with the Industrial grade (-40°C to +85°C) specification for the IMS variant.

Selection Notes

Select this component when multiple low-resolution analog outputs are required within a compact footprint. The external reference option provides flexibility for system-level calibration or scaling. Compare against internal reference variants if fixed 2.5V or 4.096V outputs are sufficient, as they may offer simplified board layout by eliminating the external reference source.

Part Context

This part belongs to the LTC2637 family, which includes 12-bit, 10-bit, and 8-bit resolutions. Variants differ by internal vs. external reference selection, power-on reset states (zero-scale vs. mid-scale), and full-scale voltage options (2.5V or 4.096V). The IMS designation indicates the Industrial temperature grade and MSOP package type.

Replacement Considerations

Direct substitutes within the same family include LTC2637IMS-LZ8#TRPBF (Zero-Scale reset) or LTC2637IMS-LMI8#TRPBF (Internal Reference, Mid-Scale reset). Cross-family replacements like the LTC2636 require verification of interface compatibility and pinout differences.