LTC2666HUH-12#PBF

Overview

The LTC2666HUH-12#PBF is an octal, 12-bit digital-to-analog converter (DAC) featuring SoftSpan technology and an integrated precision reference. It provides eight independent voltage outputs with a maximum swing of ±10V. The device includes a built-in 2.5V reference with a maximum temperature coefficient of 10ppm/°C. Key electrical specifications include a settling time of 15.5µs for a ±20V step, a differential nonlinearity (DNL) of ±0.05 LSB, and an integral nonlinearity (INL) of ±0.2 LSB. It operates within a temperature range of –40°C to 125°C.

Feature Summary

• Octal 12-bit resolution with independently programmable output ranges: 0V to 5V, 0V to 10V, ±2.5V, ±5V, and ±10V.
• Integrated 2.5V precision reference with a maximum temperature coefficient of 10ppm/°C.
• A/B toggle capability via dedicated pin or software command; includes an 8:1 analog multiplexer.
• SPI/Microwire-compatible 3-wire serial interface operating at clock rates up to 50MHz.

Applications

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

Procurement Notes

Verify the specific suffix 'HUH' corresponds to the 32-lead QFN package and the '-12' indicates 12-bit resolution. Confirm the '#PBF' designation ensures lead-free compliance. Cross-reference the manufacturer's ordering guide to ensure the selected part matches the required automotive-grade temperature range of –40°C to 125°C.

Selection Notes

Select this component when multiple channels are required in a single package. Ensure the system supports the necessary bipolar supply rails (typically ±15V) or single-supply configurations if V– is tied to ground. Verify that the 12-bit resolution meets the application's accuracy requirements, as the H-grade variant offers tighter linearity specifications compared to lower grades.

Part Context

This part belongs to the LTC2666 family of SoftSpan DACs. The 'H' suffix denotes the extended temperature grade suitable for harsh environments. The 'UH' package type identifies the 32-lead plastic QFN form factor. This specific model integrates both the DAC cores and the reference circuitry, reducing external component count.

Replacement Considerations

Direct replacements within the same family include the LTC2666IUH-12#PBF for industrial temperatures (-40°C to 85°C) or the LTC2666CUH-12#PBF for commercial temperatures (0°C to 70°C). Ensure any substitute maintains the 12-bit resolution and QFN-32 package compatibility.

FAQ

What is the maximum output current drive capability?

The outputs are guaranteed to drive ±10mA.

How is the initial output range determined upon power-up?

The power-on span and reset code are selected by hardwiring the MSP0, MSP1, and MSP2 pins to VCC or GND.

Can the internal reference be disabled?

Yes, tying the REFCOMP pin to GND disables the internal reference at startup, allowing the use of an external reference.