LTC2668CUJ-16#TRPBF

Overview

The LTC2668CUJ-16#TRPBF is a 16-channel, 16-bit digital-to-analog converter (DAC) family member in a 40-lead 6mm × 6mm QFN package. It features independently programmable SoftSpan output ranges of 0V to 5V, 0V to 10V, ±2.5V, ±5V, and ±10V. The device includes an integrated 2.5V reference with a maximum drift of 10ppm/°C and supports external references for additional range options. Key specifications include a maximum integral nonlinearity (INL) error of ±4 LSB at 16 bits, guaranteed monotonicity over temperature, and A/B toggle capability via software or dedicated pin. The serial interface operates on logic levels as low as 1.71V at clock rates up to 50MHz.

Feature Summary

• 16 independent channels with 16-bit resolution and ±10V output capability
• SoftSpan technology allowing per-channel programmable output ranges
• Integrated precision 2.5V reference with 10ppm/°C max temperature coefficient
• 3-wire SPI/Microwire compatible interface supporting 50MHz clock rates

Applications

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

Procurement Notes

Verify the TR suffix indicates tape and reel packaging containing 2000 pieces. Confirm the C grade corresponds to the commercial temperature range of 0°C to 70°C. Ensure the UJ package designation matches the 40-lead 6mm × 6mm QFN form factor required for the target PCB layout.

Selection Notes

Select this part for applications requiring high channel density and flexible voltage ranges without external level shifting. The internal reference simplifies design but may require external buffering for low-noise requirements. Consider the H-grade variant if operation beyond 70°C is necessary. Verify supply voltage compatibility, as the device requires AVP between 4.5V and 5.5V and V+/V– between ±4.5V and ±15.75V.

Part Context

This component belongs to the LTC2668 family, which also offers 12-bit resolution variants and different temperature grades (I-grade: –40°C to 85°C; H-grade: –40°C to 125°C). The CUJ-16#PBF version uses tube packaging, while the #TRPBF suffix denotes tape and reel packaging for automated assembly. All variants share the same electrical characteristics and pinout within their respective temperature ranges.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Cross-referencing should focus on matching the 16-channel architecture, 16-bit resolution, and SoftSpan functionality. Verify that any alternative device supports the same 6mm × 6mm QFN footprint and 3-wire serial interface timing constraints.