LTC2753IUK-14#PBF

Overview

The LTC2753IUK-14#PBF is a dual-channel, 14-bit multiplying digital-to-analog converter (DAC) with parallel input/output interface. 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 and includes a power-on reset circuit that initializes outputs to 0V. Key electrical specifications include a maximum settling time of 2µs to ±1 LSB, a glitch impulse of 1nV•s, and a typical supply current of 0.5µA.

Feature Summary

• Dual 14-bit current-output DACs with bidirectional parallel I/O and register readback capability
• SoftSpan architecture providing six software-programmable or pin-strapped output ranges
• Guaranteed monotonic operation over the full industrial temperature range (-40°C to 85°C)
• Asynchronous CLR pin clears DAC outputs to 0V; Power-On Reset initializes to 0V

Applications

• Process control and industrial automation systems
• Automatic test equipment requiring precise voltage/current generation
• Data acquisition systems utilizing multiplying DAC functionality

Procurement Notes

Verify the specific suffix 'I' indicates the industrial temperature grade (-40°C to 85°C) and '#PBF' denotes lead-free packaging. Confirm the package type is the 48-lead 7mm × 7mm QFN. Ensure the design supports the required parallel interface timing and external reference configuration for the selected SoftSpan range.

Selection Notes

Select this part when dual-channel 14-bit resolution is sufficient, as opposed to the 16-bit variants which offer tighter linearity specs. The 'I' grade is required for environments operating between -40°C and 85°C. Consider the 2µs settling time and 1nV•s glitch impulse for dynamic applications. External amplifiers are necessary to convert the current output to voltage if using the standard SoftSpan ranges.

Part Context

This component belongs to the LTC2753 family of SoftSpan DACs, which also includes 12-bit and 16-bit versions. The 14-bit variant offers a balance between resolution and cost/performance metrics compared to the higher-precision 16-bit models. It shares the same 48-pin QFN footprint and pinout structure as other members of the series, facilitating board layout reuse across different resolution requirements.

Replacement Considerations

LTC2753IUK-12#PBF provides 12-bit resolution with identical pinout and interface. LTC2753IUK-16#PBF provides 16-bit resolution with identical pinout and interface. For commercial temperature range (0°C to 70°C), substitute with LTC2753CUK-14#PBF.