LTC2635CUD-LMO12#PBF

Overview

The LTC2635CUD-LMO12#PBF is a quad 12-bit voltage-output digital-to-analog converter (DAC) featuring an integrated precision reference with 10ppm/°C drift. It operates from a single 2.7V to 5.5V supply, providing a full-scale output of 2.5V. The device includes rail-to-rail output buffers and guarantees monotonicity over the –40°C to 125°C automotive temperature range. Communication occurs via a 2-wire I2C-compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. The LMO suffix configures the power-on reset to place all DAC outputs in a high-impedance state upon initialization.

Feature Summary

• Quad 12-bit resolution with maximum INL error of ±2.5 LSB
• Integrated 2.5V full-scale reference with 10ppm/°C temperature coefficient
• Power-on reset option for High-Impedance DAC outputs (LMO variant)
• Ultralow crosstalk between DACs at 3nV•s typical

Applications

• Mobile Communications
• Process Control and Industrial Automation
• Power Supply Margining
• Portable Equipment
• Automotive Systems

Procurement Notes

Verify the specific ordering suffix 'LMO' confirms the high-impedance power-on reset behavior, as this differs from other variants like 'Z' (zero-scale) or 'MI' (mid-scale). Ensure the package type matches the design requirements, as this part number specifies the 16-pin QFN format. Confirm lead-free status via the '#PBF' designation if required by assembly specifications.

Selection Notes

Select this component when four independent 12-bit channels are required within a compact footprint. The LMO variant is critical for applications where floating outputs are safer than defined voltage levels during startup. Verify that the system supply voltage remains within the 2.7V to 5.5V range compatible with the 'L' grade internal reference. Consider the external reference capability if a different full-scale voltage is needed.

Part Context

This part belongs to the LTC2635 family of quad DACs, which also includes 8-bit and 10-bit resolutions. The 'C' indicates the commercial temperature grade (0°C to 70°C), while the datasheet notes guaranteed monotonicity over the wider automotive range. The 'UD' suffix denotes the 16-pin 3mm × 3mm QFN package. Other variants include the LTC2635-H series for 4.096V full-scale outputs requiring higher supply voltages.

Replacement Considerations

Direct substitutes within the same family include LTC2635CUD-ZO12#PBF (Zero-Scale reset) or LTC2635CUD-MI12#PBF (Mid-Scale reset). For different resolutions, consider LTC2635CUD-LMO10#PBF (10-bit) or LTC2635CUD-LMO8#PBF (8-bit). Cross-family replacements require verification of pin compatibility and register mapping.