LTC2751BCUHF-16#PBF

Overview

The LTC2751BCUHF-16#PBF is a 16-bit, single-channel current-output digital-to-analog converter (DAC) from Analog Devices. It 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 operates on a single 2.7V to 5.5V supply with a maximum supply current of 1µA. It utilizes a bidirectional parallel interface supporting readback of all internal registers. Key electrical specifications include ±1 LSB INL and DNL over temperature, a settling time of 2µs to ±1 LSB, and guaranteed monotonicity. The component is housed in a 38-lead 5mm × 7mm QFN package and is specified for the commercial temperature range of 0°C to 70°C.

Feature Summary

• SoftSpan Technology: Six software-programmable output ranges including unipolar (0V to 5V, 0V to 10V) and bipolar (±2.5V, ±5V, ±10V, –2.5V to 7.5V).
• High Precision: Guaranteed ±1 LSB Integral Nonlinearity (INL) and Differential Nonlinearity (DNL) over the operating temperature range without adjustments.
• Bidirectional Parallel Interface: Supports readback of any on-chip register via data I/O pins; includes asynchronous CLR pin for clearing DAC output to 0V.
• Low Power Consumption: Maximum supply current of 1µA at VDD = 5V; power-on reset initializes DAC output to 0V.

Applications

• Process Control and Industrial Automation
• Automatic Test Equipment
• Data Acquisition Systems

Procurement Notes

Verify that the specific ordering suffix 'BC' corresponds to the B-grade performance level (±1 LSB INL/DNL) rather than the C-grade or A-grade variants within the LTC2751 family. Confirm the package type is the 38-lead 5mm × 7mm Plastic QFN (UHF). Ensure the temperature grade matches the requirement for the commercial range (0°C to 70°C), as indicated by the 'C' in the part number. Cross-reference the datasheet revision to ensure compatibility with system timing requirements.

Selection Notes

Select this component when a single-channel, high-accuracy current-output DAC with software-selectable voltage ranges is required. The LTC2751BCUHF-16#PBF is suitable for applications demanding low glitch impulse (1nV·s) and minimal supply current. Note that an external operational amplifier is required to convert the current output to a voltage signal; op amp selection significantly impacts overall system accuracy. For systems requiring multiple channels, consider the LTC2753 or LTC2754 families instead.

Part Context

The LTC2751 is part of Analog Devices' SoftSpan DAC family, which integrates multiplying capabilities with selectable output spans. The 'B' designation indicates a specific performance bin ensuring tighter linearity specifications compared to standard grades. This model represents the 16-bit resolution variant within the series, offering higher precision than the 12-bit (LTC2751-12) and 14-bit (LTC2751-14) versions. It shares the same physical footprint and interface logic with other resolutions in the UHF package, facilitating design flexibility across different precision requirements.

Replacement Considerations

Direct replacements within the same package and interface include the LTC2751ACUHF-16#PBF (higher grade, industrial temp) or LTC2751CUHF-16#PBF (standard grade). For multi-channel needs, the LTC2753 (2-channel) or LTC2754 (4-channel) offer similar SoftSpan functionality but require interface adaptation. Lower resolution options like LTC2751-14 or LTC2751-12 are pin-compatible but offer reduced accuracy.