LTC2634CUD-LMI12#PBF

Overview

The LTC2634CUD-LMI12#PBF is a quad 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices, housed in a 16-lead 3mm × 3mm QFN package. It features an integrated precision reference providing a 2.5V full-scale output 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 temperature range, and a maximum integral nonlinearity error of ±2.5 LSB. Communication is handled via a 3-wire SPI/MICROWIRE compatible interface with clock rates up to 50MHz. Upon power-up, the outputs reset to mid-scale.

Feature Summary

• Quad 12-bit resolution with integrated 10ppm/°C precision reference
• Rail-to-rail output buffers with 2.5V full-scale voltage
• SPI/MICROWIRE compatible 3-wire serial interface operating at 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 specific ordering suffix #PBF indicates lead-free compliance. Confirm the C grade corresponds to the commercial temperature range of 0°C to 70°C for storage and handling requirements. 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 four independent 12-bit DAC channels are required in a compact footprint. The LMI12 suffix specifies a 2.5V internal reference and mid-scale power-on reset. For higher voltage swings, consider the H-grade variants which support 4.096V full-scale but require a minimum 4.5V supply. Verify that the 50MHz serial clock speed meets system timing constraints.

Part Context

This component belongs to the LTC2634 family of quad DACs, which also offers 10-bit and 8-bit resolutions. Variants exist in both 16-lead QFN and 10-lead MSOP packages. The family supports selectable internal or external reference modes and different power-on reset behaviors, including zero-scale or mid-scale options depending on the specific suffix configuration.

Replacement Considerations

Direct pin-compatible replacements within the same package include other LTC2634 variants such as LTC2634CUD-LZ12#PBF or LTC2634CUD-HMI12#PBF, provided the reset behavior and reference voltage requirements align with the design specifications.