LTC2666IUH-12#PBF

Overview

The LTC2666IUH-12#PBF is an octal, 12-bit digital-to-analog converter featuring SoftSpan technology for independently programmable output ranges up to ±10V. It integrates a precision reference with a maximum temperature coefficient of 10ppm/°C and built-in rail-to-rail output buffers capable of driving ±10mA. The device operates on analog supplies from 4.5V to 15.75V (V+) and -15.75V to 0V (V–), with a digital I/O supply ranging from 1.71V to VCC+0.3V. It utilizes a 3-wire SPI/Microwire-compatible serial interface operating at clock rates up to 50MHz. Key specifications include a maximum integral nonlinearity (INL) error of ±1 LSB and differential nonlinearity (DNL) of ±0.05 LSB.

Feature Summary

• Octal 12-bit resolution with independent SoftSpan programming for five output ranges: 0V to 5V, 0V to 10V, ±2.5V, ±5V, and ±10V.
• Integrated precision reference with a maximum temperature coefficient of 10ppm/°C; supports external reference input.
• Built-in rail-to-rail output buffers guarantee monotonicity and drive ±10mA load currents.
• Includes an 8:1 analog multiplexer, A/B toggle capability via software or dedicated pin, and thermal protection interrupt.

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 a lead-free finish. Confirm the 'I' grade designation corresponds to the –40°C to 85°C industrial temperature range required for the application environment. Ensure the QFN-32 package footprint matches the PCB layout guidelines provided in the datasheet, particularly regarding the exposed pad connection to V–.

Selection Notes

Select this component when multiple channels requiring independent voltage scaling are necessary within a single package. The 12-bit resolution offers a balance between cost and performance for applications not requiring 16-bit precision. Consider the internal reference stability if external references cannot be used, and verify that the ±10V output swing capability aligns with the system's signal requirements.

Part Context

This part belongs to the LTC2666 family of SoftSpan DACs, which also includes 16-bit variants (LTC2666-16). The IUH-12 suffix specifically denotes the 12-bit resolution version housed in a 32-lead 5mm × 5mm QFN package with an industrial temperature rating. It shares the same pinout and core architecture as other grades in the series, differing primarily in resolution and temperature limits.

Replacement Considerations

Direct replacements within the same family include the LTC2666IUH-16#PBF for higher resolution or the LTC2666HUH-12#PBF for extended automotive temperature ranges (-40°C to 125°C). Cross-family replacements like the LTC2664 offer similar functionality but with only four channels instead of eight.