LTC2666IUH-16#PBF

Overview

The LTC2666IUH-16#PBF is an octal, 16-bit digital-to-analog converter (DAC) featuring SoftSpan technology for independently programmable output ranges up to ±10V. It integrates a precision 2.5V reference with a maximum temperature coefficient of 10ppm/°C and includes an 8:1 analog multiplexer. The device operates on a single 4.5V to 5.5V analog supply (VCC) and bipolar analog supplies (V+/V–) ranging from ±4.5V to ±15.75V, or single-supply configurations with V– tied to ground. It utilizes a 3-wire SPI/Microwire-compatible serial interface supporting clock rates up to 50MHz. Key electrical specifications include a maximum integral nonlinearity (INL) of ±4 LSB at 16 bits, a settling time of 20µs for a ±20V step, and guaranteed monotonicity over the industrial temperature range of –40°C to 85°C.

Feature Summary

• Octal 16-Bit Resolution with Independently Programmable Output Ranges (0V to 5V, 0V to 10V, ±2.5V, ±5V, ±10V)
• Integrated Precision Reference with 10ppm/°C Maximum Temperature Coefficient
• Built-in Rail-to-Rail Output Buffers Driving ±10mA Guaranteed
• 8:1 Analog Multiplexer and 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 in tube format. Confirm the 'I' grade designation corresponds to the required industrial operating temperature range of –40°C to 85°C. Ensure the ordering information matches the 32-lead QFN package dimensions. Cross-reference the datasheet revision date to confirm compatibility with current design specifications.

Selection Notes

Select this component when eight independent channels with high accuracy are required. The SoftSpan feature allows different voltage ranges per channel, eliminating external scaling circuitry. Verify that the system power supplies can accommodate the specified V+ and V– ranges. Consider the 50MHz SPI speed if high throughput is necessary. Ensure thermal management supports the junction temperature limits under maximum load conditions.

Part Context

This part belongs to the LTC2666 family of SoftSpan DACs. The 'I' suffix denotes the industrial temperature grade, distinguishing it from the commercial (C) and automotive/high-temperature (H) variants. The 'UH' package code specifies the 32-lead 5mm × 5mm QFN form factor. Other family members include lower resolution options like the LTC2666-12.

Replacement Considerations

Direct pin-compatible replacements within the same package include the LTC2666CUH-16#PBF for commercial temperature applications and the LTC2666HUH-16#PBF for extended temperature ranges. Lower resolution alternatives such as the LTC2666IUH-12#PBF offer similar functionality with reduced bit depth.