LTC2751CUHF-14#PBF

Overview

The LTC2751CUHF-14#PBF is a 14-bit, multiplying, current-output digital-to-analog converter (DAC) from Analog Devices. It operates on a single 2.7V to 5.5V supply and features SoftSpan technology for six programmable output ranges: two unipolar (0V to 5V, 0V to 10V) and four bipolar (±2.5V, ±5V, ±10V, –2.5V to 7.5V). The device guarantees monotonicity over temperature with a maximum integral nonlinearity (INL) of ±1 LSB and differential nonlinearity (DNL) of ±1 LSB. It includes a bidirectional parallel interface with register readback, an asynchronous clear pin, and power-on reset to 0V. Packaged in a 38-lead QFN.

Feature Summary

• SoftSpan Technology: Six software-programmable output ranges including unipolar and bipolar options.
• High Precision: 14-bit resolution with ±1 LSB INL and DNL guaranteed over the operating temperature range.
• Bidirectional Parallel Interface: Supports write operations and readback of all internal registers via data and span I/O pins.
• Low Power Consumption: Maximum supply current of 1µA at VDD = 5V.

Applications

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

Procurement Notes

Verify the component marking '275114' and the 38-lead QFN package configuration against the datasheet specifications. Confirm the commercial temperature grade (0°C to 70°C) matches the design requirements. Ensure the exposed pad is soldered to the PCB ground plane as required by the pin configuration.

Selection Notes

Select this model for applications requiring precise current output with flexible voltage scaling via external amplifiers. The 14-bit resolution offers a balance between performance and pin count compared to the 16-bit variant. Ensure the external reference voltage does not exceed ±15V on RIN/REF pins and that the op-amp selection supports the desired settling time and noise performance.

Part Context

This part belongs to the LTC2751 family of SoftSpan DACs, which also includes 12-bit and 16-bit variants. The 'C' suffix denotes the commercial temperature range (0°C to 70°C), while 'I' indicates industrial range (-40°C to 85°C). The 'UHF' suffix specifies the 38-lead plastic QFN package. The '#PBF' suffix indicates a lead-free finish.

Replacement Considerations

Direct replacements within the same package and pinout include LTC2751CUHF-12#PBF (12-bit) and LTC2751ACUHF-14#PBF (if available in 14-bit A-grade). For higher precision, consider the LTC2751BIUHF-16#PBF, noting the increased bit depth and potential differences in gain error specifications.