LTC2635CUD-LZ12#PBF

Overview

The LTC2635CUD-LZ12#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 yielding a 2.5V full-scale output with a temperature coefficient of 10ppm/°C. The device operates on a single 2.7V to 5.5V supply and includes rail-to-rail output buffers guaranteed monotonic over the commercial temperature range of 0°C to 70°C. Communication is handled via a 2-wire I²C-compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. A power-on reset circuit defaults outputs to zero-scale.

Feature Summary

• Quad 12-bit resolution with maximum INL error of ±2.5 LSB
• Integrated 2.5V precision reference with 10ppm/°C drift
• Rail-to-rail output buffers with ultralow crosstalk (3nV•s)
• Power-on reset to zero-scale with low noise (0.75mV P-P)

Applications

• Mobile communications systems
• Process control and industrial automation
• Power supply margining

Procurement Notes

Verify the specific suffix #PBF indicates lead-free construction and that the UD package corresponds to the 16-pin QFN form factor. Confirm the LZ designation ensures the internal reference resets to zero-scale upon power-up. Ensure the C-grade temperature rating aligns with the intended operational environment limits.

Selection Notes

Select this component when four independent 12-bit channels are required within a compact footprint. The 2.5V internal reference simplifies design by eliminating external components. Verify that the 2.7V minimum supply voltage meets system requirements, as the H-grade variant requires a higher 4.5V minimum for its 4.096V output range.

Part Context

This part belongs to the LTC2635 family, which offers 8-, 10-, and 12-bit resolutions in both QFN and MSOP packages. The LZ suffix specifically configures the power-on reset behavior to zero-scale, distinguishing it from mid-scale or high-impedance options available in other variants like LMI or LMO.

Replacement Considerations

Direct substitutes include other LTC2635 variants with different resolutions or reset behaviors, such as LTC2635CUD-LMI12#PBF for mid-scale reset. Cross-family replacements require verification of pin compatibility and I²C address configurations.