LTC2654CUF-H12#PBF

Overview

The LTC2654CUF-H12#PBF is a quad 12-bit rail-to-rail digital-to-analog converter (DAC) in a 20-lead 4mm × 4mm QFN package. It features an integrated reference providing a full-scale output of 4.096V and operates from a 4.5V to 5.5V supply. The device includes high-performance output buffers, guaranteed monotonicity, and a 4-wire SPI/MICROWIRE compatible interface with clock rates up to 50MHz. Key electrical specifications include a maximum integral nonlinearity (INL) error of ±1 LSB, a settling time of 4.6µs for 12-bit accuracy, and ultralow crosstalk between channels.

Feature Summary

• Quad 12-bit resolution with integrated 4.096V reference
• Rail-to-rail output buffers with ±2mV max offset error
• SPI/MICROWIRE interface supporting 50MHz clock rates
• Ultralow DAC-to-DAC crosstalk (<3nV•s)

Applications

• Mobile communications
• Process control and industrial automation
• Instrumentation
• Automatic test equipment
• Automotive systems

Procurement Notes

Verify the specific suffix 'H12' confirms the 4.096V full-scale range and 12-bit resolution. Ensure the 'UF' designation matches the required 20-lead QFN footprint. Confirm the '#PBF' indicates lead-free construction. Cross-reference the manufacturer's latest documentation for any updates to the operating temperature range or pinout configurations.

Selection Notes

Select this component when a quad-channel DAC with a fixed 4.096V internal reference is required. The -H suffix restricts operation to 4.5V–5.5V supplies; use the -L variant for 2.7V–5.5V operation with a 2.5V reference. Consider the QFN package for space-constrained designs requiring thermal dissipation through the exposed pad. Verify that the 50MHz serial interface speed meets system timing requirements.

Part Context

This part belongs to the LTC2654 family of precision voltage-output DACs. It shares architectural similarities with the LTC2655 but utilizes a serial interface instead of I2C. The CUH12 designation specifically identifies the commercial grade, 12-bit resolution, and 4.096V full-scale configuration within the 20-lead QFN form factor.

Replacement Considerations

Direct substitutes include other parts in the LTC2654 family with different resolutions or reference voltages, such as the LTC2654CUF-L12#PBF for 2.5V operation. For I2C interfaces, consider the LTC2655 series. Verify pin compatibility and software register maps when replacing with variants.