LTC2642IDD-12#TRPBF

Overview

The LTC2642IDD-12#TRPBF is a 12-bit unbuffered voltage output DAC in a 10-lead 3mm × 3mm DFN package. It operates from a single 2.7V to 5.5V supply with a typical supply current of 120µA. The device features a 3-wire SPI/MICROWIRE compatible serial interface with clock rates up to 50MHz. It includes matched scaling resistors for bipolar operation with an external op amp, generating a ±VREF output swing. Power-on reset clears the DAC to midscale, and an asynchronous CLR pin allows clearing to midscale. The component is guaranteed monotonic over temperature and specified for the industrial range (-40°C to 85°C).

Feature Summary

• 12-bit resolution with ±0.5 LSB INL and DNL over temperature.
• Unbuffered voltage output directly drives loads >60kΩ.
• Integrated matched scaling resistors for bipolar ±VREF operation.
• Fast 1µs settling time to 16-bit accuracy (equivalent).

Applications

• Process control and industrial automation systems.
• Automatic test equipment requiring precise voltage references.
• Data acquisition systems needing low power consumption.

Procurement Notes

Verify the ordering suffix #TRPBF indicates tape and reel packaging. Confirm the IDD suffix corresponds to the industrial temperature range (-40°C to 85°C). Ensure the 12# denotes the 12-bit resolution variant. Check that the DD suffix matches the 10-lead 3mm × 3mm DFN package type required for the design.

Selection Notes

Select this part when bipolar output capability is required without external resistor networks. The unbuffered output requires load resistance greater than 60kΩ to maintain linearity specifications. For applications needing buffered outputs or different resolutions, consider the LTC2641 family or other bit-depth variants within the same series.

Part Context

This component belongs to the LTC2641/LTC2642 family of 16-/14-/12-bit DACs. The LTC2642 variant specifically includes internal bipolar scaling resistors, distinguishing it from the unipolar-only LTC2641. The 12-bit version offers lower resolution but maintains the same package and interface characteristics as the higher-resolution counterparts.

Replacement Considerations

Publicly confirmed substitutes include other parts within the LTC2642 family such as LTC2642IDD-14#TRPBF or LTC2642IDD-16#TRPBF for higher resolution. Unipolar equivalents like LTC2641IDD-12#TRPBF are functionally similar but lack bipolar scaling resistors. Verify pin compatibility and thermal performance when substituting.