LTC2657IUFD-L12#PBF

Overview

The LTC2657IUFD-L12#PBF is an octal, 12-bit digital-to-analog converter featuring a precision integrated reference with a maximum temperature coefficient of 10ppm/°C. It operates from a single 2.7V to 5.5V supply and provides rail-to-rail output buffers guaranteed monotonic over the operating temperature range. The device utilizes a 2-wire I²C compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. Key electrical specifications include a maximum integral nonlinearity error of ±1LSB, a typical settling time of 3.9µs for ±1LSB accuracy, and ultralow DAC-to-DAC crosstalk of 0.8nV•s.

Feature Summary

• Octal architecture with 12-bit resolution and integrated 10ppm/°C reference
• Rail-to-rail output buffers with guaranteed monotonicity
• I²C serial interface supporting 400kHz clock rates
• Power-on reset configurable to zero-scale or mid-scale via PORSEL pin

Applications

• Mobile communications systems
• Process control and industrial automation
• Instrumentation equipment
• Automatic test equipment
• Automotive applications

Procurement Notes

Verify that the specific part number matches the required temperature grade and package configuration. Confirm that the internal reference voltage option corresponds to the system design requirements, as the -L suffix indicates a 2.5V full-scale output. Ensure compatibility with the host controller's I²C address settings using the CA pins.

Selection Notes

Select this component when multiple low-cost, high-accuracy voltage outputs are required in a compact form factor. The 12-bit resolution and ±1LSB INL make it suitable for general-purpose control loops. Consider the external reference mode if a different full-scale voltage than 2.5V is needed, as the output span can be set to twice the external reference voltage.

Part Context

This part belongs to the LTC2657 family of octal DACs. The 'I' designation specifies the industrial temperature range of –40°C to 85°C. The 'UFD' suffix indicates the 20-lead (4mm × 5mm) plastic QFN package. The 'L12' identifier confirms the 12-bit resolution and the 2.5V full-scale output derived from the internal 1.25V reference.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.