LTC2751CUHF-12#PBF

Overview

The LTC2751CUHF-12#PBF is a 12-bit multiplying digital-to-analog converter with parallel input and current output. It operates from 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 of ±1 LSB and differential nonlinearity of ±1 LSB. Key electrical parameters include a settling time of 2µs to ±1 LSB, a supply current of 1µA maximum, and a glitch impulse of 1nV•s. It utilizes a bidirectional parallel interface allowing readback of all internal registers.

Feature Summary

• SoftSpan Technology: Six software-programmable output ranges including unipolar and bipolar configurations.
• High Precision: Guaranteed monotonic operation with ±1 LSB INL and DNL across the commercial temperature range.
• Low Power Consumption: Maximum supply current of 1µA at VDD = 5V.
• Bidirectional Parallel Interface: Supports write, update, and full register readback operations.

Applications

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

Procurement Notes

Verify the operating temperature range corresponds to the 'C' suffix, which indicates a commercial range of 0°C to 70°C. Ensure the package matches the 38-lead 5mm × 7mm QFN specification. Confirm that the application requires a 12-bit resolution variant rather than the 14-bit or 16-bit versions within the same family.

Selection Notes

Select this component when a low-power, high-accuracy current-output DAC with flexible voltage range programming is required. The 12-bit resolution offers a balance between performance and pin count compared to higher-resolution variants. Ensure the external reference voltage supports the desired SoftSpan scaling, typically 2V or 5V. Verify that the system can accommodate the parallel I/O interface timing requirements.

Part Context

This part belongs to the LTC2751 family of SoftSpan DACs, which includes 12-bit, 14-bit, and 16-bit variants. The 'CUHF' designation specifies the commercial temperature grade and the 38-lead QFN package. The '#PBF' suffix indicates a lead-free finish compliant with RoHS standards. All parts in the family share the same pinout and core architecture but differ in resolution and linearity specifications.

Replacement Considerations

Direct replacements within the same family include LTC2751IUHF-12#PBF for an extended industrial temperature range (-40°C to 85°C). Higher resolution options such as LTC2751BIUHF-16#PBF are available if greater precision is needed. Lower resolution variants like the LTC2751CUHF-14#PBF may be considered if cost or specific bit-depth constraints apply.