LTC2656CCUFD-L16#PBF

Overview

The LTC2656CCUFD-L16#PBF is an octal, 16-bit digital-to-analog converter (DAC) featuring a precision integrated reference with a maximum temperature coefficient of 10ppm/°C. It operates on a single 2.7V to 5.5V supply and provides rail-to-rail output buffers guaranteed monotonic over the full temperature range. The device incorporates a power-on reset circuit configurable for zero-scale or mid-scale initialization. Communication is handled via a 4-wire SPI/MICROWIRE compatible serial interface supporting clock rates up to 50MHz. The component is housed in a 20-lead 4mm × 5mm plastic QFN package.

Feature Summary

• Octal architecture with 16-bit resolution and ±12LSB maximum integral nonlinearity (INL)
• Integrated 1.25V reference with 10ppm/°C max temperature coefficient
• Rail-to-rail output buffers with ultralow crosstalk (<1nV•s)
• Configurable power-on reset to zero-scale or mid-scale via PORSEL pin

Applications

• Mobile Communications
• Process Control and Industrial Automation
• Instrumentation
• Automatic Test Equipment
• Automotive Systems

Procurement Notes

Verify that the ordering suffix matches the required specifications: 'C' indicates commercial temperature range (0°C to 70°C), 'UFD' denotes the 20-lead QFN package, and 'L16' specifies the 2.5V full-scale output with 16-bit resolution. Confirm lead-free finish designation '#PBF'. Ensure the application voltage requirements align with the 2.7V to 5.5V operating range specified for the -L option.

Selection Notes

Select this part when eight independent 16-bit DAC channels are required within a compact footprint. The C-grade offers ±12LSB INL, suitable for general-purpose applications where higher accuracy grades (B-grade, ±4LSB) are not necessary. Choose the UFD package for space-constrained PCB designs requiring a 4mm × 5mm profile. Verify if the internal 2.5V reference meets system requirements; otherwise, consider external reference configurations.

Part Context

This component belongs to the LTC2656 family of octal DACs, which also includes variants with different resolutions (12-bit), accuracy grades (B-grade), and full-scale voltages (-H option for 4.096V). The CCUFD-L16#PBF specifically represents the commercial grade, 16-bit resolution, 2.5V full-scale variant in the QFN package. Other family members include the LTC2656BCUFD-L16#PBF for higher accuracy and LTC2656CUFD-L12#PBF for 12-bit resolution.

Replacement Considerations

Direct functional substitutes within the same package and specification set include the LTC2656BCUFD-L16#PBF, which offers improved accuracy (±4LSB INL) but shares identical pinout and electrical characteristics. For 12-bit resolution requirements, the LTC2656CUFD-L12#PBF is compatible. Cross-package replacements such as the FE (TSSOP) variants require schematic review due to pin configuration differences.