LTC2668HUJ-16#PBF

Overview

The LTC2668HUJ-16#PBF is a 16-channel, 16-bit voltage output digital-to-analog converter (DAC) in a 40-lead 6mm × 6mm QFN package. It features SoftSpan technology allowing each channel to be independently programmed for five output ranges: 0V to 5V, 0V to 10V, ±2.5V, ±5V, or ±10V. The device includes an integrated precision reference with a maximum temperature coefficient of 10ppm/°C and supports external references. Key electrical specifications include a settling time of 20.5µs for the ±10V range, guaranteed monotonicity over temperature, and rail-to-rail output buffers capable of driving ±10mA loads.

Feature Summary

• 16 independent channels with individually programmable SoftSpan output ranges up to ±10V
• Integrated 2.5V precision reference with 10ppm/°C maximum drift; supports external reference input
• 3-wire SPI/Microwire compatible serial interface operating at clock rates up to 50MHz
• Built-in rail-to-rail output buffers guaranteeing ±10mA drive current capability

Applications

• Optical networking systems
• Precision instrumentation
• Automatic test equipment
• Process control and industrial automation

Procurement Notes

Verify that the specific part number corresponds to the H-grade automotive temperature variant (-40°C to +125°C). Confirm the suffix #PBF indicates lead-free construction and tube packaging rather than tape and reel. Ensure compatibility with the required supply voltages and logic levels before procurement.

Selection Notes

Select this component when high channel density and flexible output voltage ranges are required within a compact footprint. The H-grade temperature rating is necessary for automotive or harsh industrial environments. Consider the internal reference's 10ppm/°C drift against application requirements, or plan for an external reference if tighter gain stability is needed under varying thermal conditions.

Part Context

This part belongs to the LTC2668 family, which also offers 12-bit resolution variants (LTC2668-12) and commercial (C-grade) or industrial (I-grade) temperature options. The HUJ-16 designation specifically identifies the 16-bit resolution, automotive temperature grade, and 40-lead QFN package configuration.

Replacement Considerations

Direct replacements within the same family include LTC2668IUJ-16#PBF for industrial temperature range applications or LTC2668CUJ-16#PBF for commercial range use. Lower pin-count alternatives like the LTC2656 series require significant board redesign due to different channel counts and interfaces.