LTC2668CUJ-12#PBF

Overview

The LTC2668CUJ-12#PBF is a 16-channel, 12-bit digital-to-analog converter (DAC) family member from Analog Devices. It features SoftSpan technology allowing independently programmable output ranges of 0V to 5V, 0V to 10V, ±2.5V, ±5V, and ±10V. The device includes an integrated precision reference with a maximum temperature coefficient of 10ppm/°C and built-in rail-to-rail output buffers capable of driving ±10mA. It operates on analog supplies ranging from 4.5V to 15.75V for V+ and -15.75V to -4.5V for V–, or single-supply configurations. The component utilizes a 3-wire SPI/Microwire-compatible serial interface operating at clock rates up to 50MHz.

Feature Summary

• 16 independent channels with 12-bit resolution
• SoftSpan™ technology for five selectable output ranges: 0V to 5V, 0V to 10V, ±2.5V, ±5V, and ±10V
• Integrated 2.5V reference with 10ppm/°C max temperature coefficient
• Built-in rail-to-rail output buffers with ±10mA drive capability
• A/B toggle capability via software command or dedicated TGP pin
• 16:1 analog multiplexer for monitoring DAC outputs

Applications

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

Procurement Notes

Verify the specific suffix '#PBF' indicates lead-free packaging when sourcing. Confirm the 'C' grade designation corresponds to the commercial temperature range of 0°C to 70°C. Ensure the ordering part number matches the required 12-bit resolution variant rather than the 16-bit version. Check for availability of the tape and reel option if high-volume manufacturing is planned.

Selection Notes

Select this model for applications requiring multiple independent voltage outputs with wide dynamic ranges without external level shifting. The 12-bit resolution offers a balance between performance and cost compared to the 16-bit variant. Consider the internal reference accuracy; for tighter drift requirements, an external low-drift reference may be connected to the REF pin. Ensure supply voltages accommodate the desired output swing headroom requirements.

Part Context

This component belongs to the LTC2668 family, which also includes 16-bit versions (LTC2668-16) and industrial/automotive temperature grades (I and H). The CUJ-12#PBF specifically denotes the commercial grade, 12-bit resolution, 40-lead QFN package, and lead-free finish. It shares the same physical footprint and pinout as other variants in the series, facilitating design flexibility across different resolution needs.

Replacement Considerations

Direct pin-compatible replacements within the same package include the LTC2668IUJ-12#PBF for industrial temperature range (-40°C to 85°C) and LTC2668HUJ-12#PBF for automotive/high-temperature range (-40°C to 125°C). For higher resolution needs, the 16-bit variants (LTC2668CUJ-16#PBF) are compatible but offer finer step sizes.