LTC2668IUJ-12#PBF

Overview

The LTC2668IUJ-12#PBF is a 16-channel, 12-bit digital-to-analog converter (DAC) from Analog Devices. It features SoftSpan technology allowing independently programmable output ranges of 0V to 5V, 0V to 10V, ±2.5V, ±5V, or ±10V. The device includes an integrated 2.5V precision reference with a maximum temperature coefficient of 10ppm/°C and rail-to-rail buffered outputs capable of driving ±10mA. It operates on analog supplies of ±4.5V to ±15.75V and a digital supply of 1.71V to 5.5V. Key performance metrics include a settling time of 15.5µs for the ±10V range, integral nonlinearity (INL) of ±0.2 LSB, and differential nonlinearity (DNL) of ±0.05 LSB.

Feature Summary

• 16-Channel 12-Bit Resolution with Independently Programmable Output Ranges
• Integrated Precision Reference with 10ppm/°C Max Temperature Coefficient
• Rail-to-Rail Buffered Outputs Driving ±10mA
• SPI/Microwire-Compatible 3-Wire Serial Interface up to 50MHz
• A/B Toggle Capability via Software or Dedicated Pin

Applications

• Optical Networking
• Instrumentation
• Data Acquisition Systems
• Automatic Test Equipment
• Process Control and Industrial Automation

Procurement Notes

Verify the specific suffix #PBF indicates lead-free packaging and tube shipping format. Confirm the 'I' grade designation matches the required industrial operating temperature range of –40°C to 85°C. Ensure the 40-lead QFN package dimensions align with the PCB footprint requirements. Cross-reference the datasheet revision date to confirm electrical characteristics remain consistent with current design specifications.

Selection Notes

Select this model when 16 channels are required in a single package. Choose the 12-bit resolution variant over the 16-bit version if lower power consumption and faster settling times are prioritized over absolute linearity. Verify that the application requires the SoftSpan feature for flexible voltage range configuration. Ensure the system can provide the necessary bipolar analog supplies (±4.5V to ±15.75V) or single-supply capability with V– tied to ground.

Part Context

This component belongs to the LTC2668 family of SoftSpan DACs. The 'IUJ' designation specifies the Industrial temperature grade and the 40-lead 6mm × 6mm QFN package. The '#PBF' suffix denotes a lead-free finish compliant with RoHS standards. It serves as a high-density solution for multi-channel signal generation where independent range control per channel is critical.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should verify pin compatibility and electrical parameter overlaps if considering alternative manufacturers. Note that ordering suffixes may change packaging or finish without altering function, requiring verification against the manufacturer's official selector guide.