LTC2751AIUHF-16#TRPBF

Overview

The LTC2751AIUHF-16#TRPBF is a 16-bit multiplying digital-to-analog converter with parallel input and current output. It operates from a single 2.7V to 5.5V supply and guarantees monotonicity over temperature. The device features SoftSpan technology, allowing six programmable output ranges (two unipolar, four bipolar) via a bidirectional parallel interface that supports register readback. Key electrical specifications include ±1 LSB maximum INL and DNL, a settling time of 2µs to ±1 LSB, and a low supply current of 1µA maximum. It is housed in a 38-lead 5mm × 7mm QFN package.

Feature Summary

• Six programmable output ranges: Unipolar (0V to 5V, 0V to 10V) and Bipolar (±5V, ±10V, ±2.5V, -2.5V to 7.5V)
• Bidirectional parallel I/O interface with readback capability for all internal registers
• Asynchronous CLR pin clears DAC output to 0V in any range; Power-on reset initializes to 0V
• Low glitch impulse of 1nV·s and supply current of 1µA maximum

Applications

• High resolution offset and gain adjustment
• Process control and industrial automation
• Automatic test equipment
• Data acquisition systems

Procurement Notes

Verify the ordering suffix #TRPBF indicates tape and reel packaging. Confirm the 'I' grade designation corresponds to the -40°C to +85°C industrial temperature range. Ensure the specific lot matches the required lead-free finish and RoHS compliance standards before procurement.

Selection Notes

Select this part for applications requiring software-selectable voltage spans without hardware changes. The bidirectional interface allows system verification of written codes. Ensure the external op-amp selection meets the error budget requirements for INL and DNL, as the DAC's high precision makes it sensitive to amplifier offset and noise characteristics.

Part Context

This component belongs to the LTC2751 family of SoftSpan DACs. The AIUHF-16 variant specifically denotes the industrial temperature grade (-40°C to +85°C), the UHF QFN package, and 16-bit resolution. The TRPBF suffix specifies the tape and reel shipping format for automated assembly.

Replacement Considerations

Direct replacements within the same family include LTC2751ACUHF-16#TRPBF (commercial grade) or LTC2751BIUHF-16#TRPBF (lower accuracy grade). Cross-family substitutes like LTC2753 (dual channel) or LTC2754 (serial interface) require significant schematic and firmware modifications due to interface and channel count differences.

FAQ

How are the output ranges programmed?

Output ranges are programmed via the S0, S1, and S2 span I/O pins using write and update commands through the parallel interface, or by hardwiring these pins when MSPAN is tied to VDD.

What is the function of the CLR pin?

The CLR pin asynchronously clears the DAC output to 0V regardless of the selected output range by resetting the data registers to the zero-volt code.

Can the device read back its internal state?

Yes, the bidirectional parallel interface allows reading back the contents of any on-chip register, including both data and span input/DAC registers, using the READ pin.