LTC2635CUD-LZ8#PBF

Overview

The LTC2635CUD-LZ8#PBF is a quad 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices Inc. 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 communicates via a 2-wire I²C-compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. It includes rail-to-rail output buffers, guaranteed monotonicity over the operating range, and a power-on reset circuit configured to initialize outputs to zero-scale.

Feature Summary

• Quad 12-bit resolution with maximum integral nonlinearity error of ±2.5 LSB
• Integrated 2.5V precision reference with 10ppm/°C drift
• Power-on reset to zero-scale in internal reference mode
• Ultralow crosstalk between DACs at 3nV•s

Applications

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

Procurement Notes

Verify that the specific part number matches the required package type and temperature grade. Confirm that the ordering suffix corresponds to the intended power-on reset behavior and resolution. Ensure compatibility with the system's I²C bus voltage levels and timing requirements before procurement.

Selection Notes

Select this component for applications requiring four independent 12-bit channels with low noise and high accuracy. The internal 2.5V reference simplifies design by eliminating external components. Consider the 16-pin QFN package for space-constrained layouts. Verify that the 2.7V to 5.5V supply range aligns with the system power architecture.

Part Context

This part belongs to the LTC2635 family, which includes variants with different resolutions (8-bit, 10-bit, 12-bit), full-scale voltages (2.5V or 4.096V), and power-on reset options. The 'L' designation indicates the 2.5V full-scale version, while 'Z' specifies the zero-scale reset configuration. The 'UD' suffix denotes the 16-lead QFN package.

Replacement Considerations

Direct substitutes within the same family include other LTC2635 variants with different resolutions or reset configurations. Cross-family replacements require matching I²C interface, resolution, and output buffer characteristics. Verify pinout compatibility and electrical specifications when considering alternative manufacturers.