LTC2634CUD-LZ8#TRPBF

Overview

The LTC2634CUD-LZ8#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 a temperature coefficient of 10ppm/°C. The device operates on a single supply ranging from 2.7V to 5.5V and includes rail-to-rail output buffers. It communicates via a 3-wire SPI/MICROWIRE compatible interface with clock rates up to 50MHz. This specific variant is AEC-Q100 qualified for automotive applications, has a power-on reset to zero-scale in internal reference mode, and is housed in a 16-lead 3mm x 3mm QFN package.

Feature Summary

• AEC-Q100 Qualified for Automotive Applications
• Integrated Precision Reference: 2.5V Full-Scale, 10ppm/°C
• Quad 8-Bit Rail-to-Rail Voltage Output DACs
• Power-On Reset to Zero-Scale in Internal Reference Mode
• SPI/MICROWIRE Compatible 3-Wire Serial Interface

Applications

• Mobile Communications
• Process Control and Industrial Automation
• Automatic Test Equipment
• Portable Equipment
• Automotive

Procurement Notes

Verify the part number suffix #TRPBF indicates lead-free construction and tape-and-reel packaging containing 2,500 pieces. Confirm the LZ designation corresponds to the zero-scale power-on reset option in internal reference mode. Ensure the C grade matches the required commercial operating temperature range of 0°C to 70°C. Cross-reference the UD package type with the 16-lead QFN physical dimensions.

Selection Notes

Select this component when a quad 8-bit DAC with automotive qualification is required. The LZ suffix ensures outputs reset to zero upon power-up, which is critical for systems sensitive to initial states. The L series supports operation down to 2.7V, suitable for lower voltage single-supply designs compared to the H series. Verify that the 2.5V full-scale output meets the downstream circuit requirements.

Part Context

This part belongs to the LTC2634 family of quad DACs available in 8-, 10-, and 12-bit resolutions. The 'L' indicates a 2.5V full-scale internal reference, while 'H' denotes 4.096V. The 'Z' suffix specifies the power-on reset behavior to zero-scale. The 'C' grade defines the commercial temperature range. Other variants include mid-scale reset options (MI/MX) and industrial/automotive temperature grades (I/H).

Replacement Considerations

Direct substitutes within the same family include LTC2634CUD-LZ10#TRPBF or LTC2634CUD-LZ12#TRPBF for higher resolution needs. For mid-scale reset functionality, consider LTC2634CUD-LMI8#TRPBF. External reference versions like LTC2634CUD-LMX8#TRPBF are compatible if external references are used.