LTC2634IUD-HZ12#PBF

Overview

The LTC2634IUD-HZ12#PBF is a quad 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features an integrated precision reference providing a 4.096V full-scale output, operating on a single 4.5V to 5.5V supply. The device utilizes a 3-wire SPI/MICROWIRE compatible serial interface with clock rates up to 50MHz. Key electrical specifications include a maximum integral nonlinearity (INL) of ±2.5 LSB and a settling time of 4.8µs at 5V. It incorporates rail-to-rail output buffers, double-buffered data latches, and a power-on reset circuit configured to clear outputs to zero-scale upon initialization.

Feature Summary

• Quad 12-bit resolution with integrated 4.096V precision reference
• SPI/MICROWIRE compatible 3-wire serial interface supporting 50MHz clocks
• Power-on reset to zero-scale for consistent system initialization
• Rail-to-rail output buffers with ultralow DAC-to-DAC crosstalk (2.4nV•s)

Applications

• Mobile communications systems
• Process control and industrial automation
• Automatic test equipment
• Portable battery-powered equipment

Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and standard packaging. Confirm the I temperature grade (-40°C to 85°C) matches the design requirements. Ensure the H designation for 4.096V full-scale is correct for the target application voltage range. Check for automotive variants if AEC-Q100 qualification is required.

Selection Notes

Select this part when four independent 12-bit channels are required in a compact QFN package. The H suffix mandates a minimum supply voltage of 4.5V; use the L suffix for 2.7V operation. The Z suffix ensures outputs start at zero volts during power-up, which is critical for protecting downstream circuits sensitive to initial voltage spikes. Verify that the 50MHz serial clock speed meets the system throughput needs.

Part Context

This component belongs to the LTC2634 family, which offers 12-, 10-, and 8-bit resolutions in both 16-lead QFN and 10-lead MSOP packages. The IUD variant specifically denotes the Industrial temperature grade (-40°C to 85°C) and the 16-lead QFN package format. Other family members differ by resolution, package type, and power-on reset behavior.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should verify pin compatibility and electrical parameters against other quad DAC families from Analog Devices or competitors if cross-referencing is necessary.