LTC2636IMS-LMX8#TRPBF

Overview

The LTC2636IMS-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 supply of 2.7V to 5.5V. The device utilizes an external reference input at the REF pin, with power-on reset configured to set outputs to mid-scale in external reference mode. It communicates via a 3-wire SPI/MICROWIRE-compatible interface supporting clock rates up to 50MHz. Key electrical characteristics include a settling time of 3.4µs, rail-to-rail output buffers, guaranteed monotonicity over the industrial temperature range of –40°C to 85°C, and ultralow DAC-to-DAC crosstalk.

Feature Summary

• Octal architecture with 8 independent 8-bit DAC channels in a 16-lead MSOP package
• External reference mode with power-on reset to mid-scale
• Rail-to-rail output buffers with ultralow crosstalk (<2.4nV•s)
• 3-wire SPI/MICROWIRE serial interface with 50MHz clock rate

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 LMX8#TRPBF against the manufacturer's current documentation to confirm the external reference configuration, 8-bit resolution, and tape-and-reel packaging quantity. Ensure the application design accommodates the 2.7V to 5.5V supply range and the industrial temperature specifications for reliable operation.

Selection Notes

Select this component when multiple low-cost, moderate-resolution voltage outputs are required in a compact surface-mount package. The external reference option allows flexibility in setting the full-scale output voltage. Compare settling times and linearity specifications against other octal DAC families if higher precision or faster update rates are needed for the target application.

Part Context

This part belongs to the LTC2636 family of octal DACs, which also includes 10-bit and 12-bit variants. The family shares common architectural features such as the integrated reference switch, power-on reset options, and serial interface. Other packages in the series include the 14-lead DFN, while different suffixes denote varying resolutions, reset behaviors, and temperature grades.

Replacement Considerations

Direct replacements within the same family include LTC2636IMS-LMI8#TRPBF (internal reference) or LTC2636IMS-LZ8#TRPBF (zero-scale reset). For different resolutions, consider LTC2636IMS-LMX10#TRPBF or LTC2636IMS-LMX12#TRPBF. Verify pin compatibility and software command code adjustments when substituting parts with different reset configurations or resolutions.

FAQ

What is the power-on reset behavior for the LTC2636IMS-LMX8?

In external reference mode, the LTC2636IMS-LMX8 resets all DAC outputs to mid-scale upon power-up.

What is the maximum serial clock frequency supported by this DAC?

The device supports a serial clock (SCK) frequency of up to 50MHz.

Does the LTC2636IMS-LMX8 have an internal reference?

No, the 'MX' suffix indicates that this variant operates in external reference mode, requiring an external voltage at the REF pin to set the full-scale output.