LTC2634CUD-HMI8#PBF

Overview

The LTC2634CUD-HMI8#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 2.5V and operates on a single 2.7V to 5.5V supply. The device includes rail-to-rail output buffers, guaranteed monotonicity over the -40°C to 125°C range, and communicates via a 3-wire SPI/MICROWIRE interface supporting clock rates up to 50MHz. It incorporates a power-on reset circuit that sets outputs to mid-scale in internal reference mode upon startup.

Feature Summary

• Quad 8-bit DACs with integrated 10ppm/°C precision reference
• Rail-to-rail output buffers with 2.5V full-scale voltage
• SPI/MICROWIRE compatible 3-wire serial interface up to 50MHz
• Power-on reset to mid-scale in internal reference mode

Applications

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

Procurement Notes

Verify the specific ordering suffix #PBF confirms lead-free compliance and RoHS requirements. Confirm the package type UD corresponds to the 16-lead QFN form factor. Ensure the temperature grade C matches the required commercial operating range of 0°C to 70°C for the application environment.

Selection Notes

Select this part for applications requiring four independent 8-bit channels with low power consumption. The HMI suffix indicates a mid-scale power-on reset behavior suitable for systems where zero-scale initialization is not required. Verify that the 2.5V internal reference meets the system's voltage swing requirements compared to external reference options.

Part Context

This component belongs to the LTC2634 family, which offers 12-, 10-, and 8-bit resolutions in both QFN and MSOP packages. The CUD variant specifically denotes the commercial temperature grade and 16-lead QFN packaging. Other variants include I-grade for industrial temperatures and H-grade for automotive applications.

Replacement Considerations

Direct substitutes within the same family include LTC2634CUD-LMI8#PBF or LTC2634CUD-HZ8#PBF, differing primarily in power-on reset behavior. For higher resolution needs, consider LTC2634CUD-HMI10#PBF or LTC2634CUD-HMI12#PBF. Cross-family alternatives like the LTC2635 offer I2C interfaces instead of SPI.