LTC2634IMSE-HMX8#PBF

Overview

The LTC2634IMSE-HMX8#PBF is a quad 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features an integrated precision reference with a full-scale output of 4.096V and operates on a single 4.5V to 5.5V supply. The device utilizes a 3-wire SPI/MICROWIRE compatible serial interface with clock rates up to 50MHz. It includes rail-to-rail output buffers, double-buffered data latches, and power-on reset to mid-scale in external reference mode. Packaged in a 10-lead MSOP, it supports industrial temperature ranges from -40°C to 85°C.

Feature Summary

• Quad 8-bit DACs with integrated 4.096V precision reference
• Rail-to-rail output buffers with guaranteed monotonicity
• SPI/MICROWIRE compatible 3-wire serial interface (up to 50MHz)
• Power-on reset to mid-scale in external reference mode

Applications

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

Procurement Notes

Verify the package type matches the required PCB footprint, as this model uses a 10-lead MSOP. Confirm the operating temperature range meets system requirements, as the 'I' suffix indicates industrial grade (-40°C to 85°C). Ensure the power supply voltage stays within the 4.5V to 5.5V range specified for the 'H' full-scale variant. Check that the external reference mode configuration aligns with the 'MX' power-on reset behavior.

Selection Notes

Select this component when a quad 8-bit DAC with a 4.096V full-scale range is needed in a compact MSOP package. The 'MX' suffix ensures outputs reset to mid-scale upon power-up when using an external reference. Choose this over the 'L' variants if the application requires a higher full-scale voltage than 2.5V. Verify that the 4.5V minimum supply voltage is compatible with the system's power rails.

Part Context

This part belongs to the LTC2634 family of quad DACs, which also offers 10-bit and 12-bit resolutions. The family shares similar architectural features but varies in accuracy, settling time, and full-scale voltage options. The IMSE designation specifically denotes the industrial temperature grade and MSOP packaging, distinguishing it from commercial or automotive grades and QFN packages.

Replacement Considerations

Direct replacements include other LTC2634 variants with matching resolution and package, such as LTC2634IMSE-HMI8#PBF (internal reference reset) or LTC2634IMSE-LMX8#PBF (2.5V full-scale). Cross-family alternatives like the LTC2635 offer I2C interfaces instead of SPI.