LTC2634CUD-HMI8#TRPBF

Overview

The LTC2634CUD-HMI8#TRPBF 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 temperature range, and low noise characteristics. Communication is handled via a 3-wire SPI/MICROWIRE compatible interface supporting clock rates up to 50MHz. This specific variant utilizes a 16-lead QFN package and incorporates a power-on reset circuit that initializes outputs to mid-scale in internal reference mode.

Feature Summary

• Quad 8-bit DACs with integrated 10ppm/°C 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 internal reference mode

Applications

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

Procurement Notes

Verify the component matches the specified 16-lead QFN package and 8-bit resolution. Confirm the ordering suffix indicates tape and reel packaging and lead-free construction. Ensure the temperature grade corresponds to commercial specifications (0°C to 70°C). Cross-reference the part number against official Analog Devices documentation to confirm availability and authenticity before procurement.

Selection Notes

Select this model for applications requiring four independent 8-bit channels with a 2.5V full-scale range. The HMI suffix ensures the outputs initialize to mid-scale upon power-up when using the internal reference. Consider the 16-lead QFN package for space-constrained designs. Verify that the 2.7V to 5.5V supply range aligns with the system power architecture and that the SPI interface timing requirements are met by the host controller.

Part Context

This component belongs to the LTC2634 family of quad DACs, which also offers 10-bit and 12-bit resolutions. Variants within the family differ by full-scale voltage (2.5V or 4.096V), power-on reset behavior, and package type (QFN or MSOP). The CUD designation identifies the commercial temperature grade and 16-lead QFN form factor, while the HMI8 specifies the 8-bit resolution and mid-scale reset configuration.

Replacement Considerations

Direct replacements within the same family include other LTC2634 variants with different resolutions or reset behaviors. For automotive applications, verify AEC-Q100 qualified parts if required. Ensure any substitute maintains the 3-wire SPI interface compatibility and similar electrical characteristics such as settling time and linearity errors.