LTC2634HUD-LMI10#PBF

Overview

The LTC2634HUD-LMI10#PBF is a quad 10-bit voltage output digital-to-analog converter (DAC) featuring an integrated precision reference with a full-scale output of 4.096V. It operates from a single 4.5V to 5.5V supply and utilizes a 3-wire SPI/MICROWIRE compatible serial interface with clock rates up to 50MHz. The device includes rail-to-rail output buffers, double-buffered data latches, and a power-on reset circuit configured to set outputs to mid-scale in internal reference mode. Packaged in a 16-lead 3mm × 3mm QFN, it supports automotive applications with an operating temperature range of –40°C to 125°C.

Feature Summary

• Quad 10-bit DACs with integrated 4.096V precision reference (10ppm/°C drift)
• SPI/MICROWIRE compatible 3-wire serial interface operating at 50MHz
• Rail-to-rail output buffers with ultralow crosstalk (2.4nV•s typical)
• Power-on reset to mid-scale in internal reference mode

Applications

• Automotive systems requiring AEC-Q100 qualified components
• Process control and industrial automation equipment
• Portable battery-powered instrumentation
• Automatic test equipment

Procurement Notes

Verify the specific suffix 'H' for the 4.5V–5.5V supply range and 'MI' for mid-scale internal reference reset behavior. Confirm the '#PBF' designation indicates lead-free compliance. Ensure the QFN package thermal pad is properly soldered to the PCB ground plane to maintain specified thermal performance and electrical grounding.

Selection Notes

Select this part when a 4.096V full-scale output is required with a minimum 4.5V supply voltage. The 'MI' suffix ensures outputs initialize to mid-scale upon power-up, which may be necessary for downstream circuit protection. Verify that the system logic levels are compatible with the 3-wire SPI interface and that the 50MHz clock rate meets the application's update speed requirements.

Part Context

This component belongs to the LTC2634 family of quad DACs, which also offers 8-bit and 12-bit resolutions. Variants exist with 2.5V full-scale outputs ('L' suffix) and different power-on reset behaviors ('Z' for zero-scale, 'MX' for external reference mid-scale). The HUD package denotes the high-temperature automotive grade (–40°C to 125°C) in a 16-lead QFN format.

Replacement Considerations

Direct pin-compatible replacements within the same family include LTC2634HUD-LMX10#PBF (external reference reset) or LTC2634HUD-HZ10#PBF (zero-scale reset). For lower resolution needs, LTC2634HUD-HI8#PBF is available. Higher precision options like the LTC2635 series use I2C instead of SPI.