LTC2654BIUF-L16#PBF

Overview

The LTC2654BIUF-L16#PBF is a quad 16-bit rail-to-rail digital-to-analog converter (DAC) from Analog Devices, housed in a 20-lead 4mm × 4mm QFN package. It features an integrated precision reference with a maximum temperature coefficient of 10ppm/°C and guaranteed monotonicity over temperature. The device operates on a single supply voltage ranging from 4.5V to 5.5V, providing a full-scale output of 4.096V when using the internal reference. Communication is handled via a 4-wire SPI/Microwire compatible serial interface supporting clock rates up to 50MHz. Key electrical specifications include a maximum integral nonlinearity (INL) error of ±4LSB at 16 bits, a low offset error of ±2mV maximum, and ultralow crosstalk between DAC channels of less than 3nV•s.

Feature Summary

• Quad 16-bit resolution with integrated 10ppm/°C max precision reference
• Rail-to-rail output buffers with <3nV•s ultralow crosstalk
• SPI/Microwire compatible 4-wire serial interface with 50MHz clock rate
• 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 the specific ordering suffix #PBF indicates lead-free construction and standard tube packaging as defined in the manufacturer's order information table. Confirm that the BIUF designation corresponds to the industrial temperature grade (-40°C to 85°C) and the 20-lead QFN package type. Ensure compatibility with the required 4.5V to 5.5V supply range for the -H variant full-scale output characteristics.

Selection Notes

Select this component when four independent 16-bit voltage outputs are required in a compact footprint. The -H suffix variant necessitates a supply voltage between 4.5V and 5.5V to achieve the 4.096V full-scale output; lower voltages may restrict the output swing. Consider the external reference mode if a different full-scale voltage is needed, as the output span becomes twice the external reference voltage. Verify that the system can accommodate the 20-lead QFN package dimensions and exposed pad soldering requirements.

Part Context

This part belongs to the LTC2654 family of quad DACs, which also includes 12-bit variants and commercial temperature grade options. The 'I' in the model name denotes the industrial temperature range (-40°C to 85°C), while 'B' specifies the electrical grade with a maximum INL of ±4LSB. The 'UF' suffix identifies the 20-lead plastic QFN package, distinct from the 16-lead narrow SSOP option available in the same family.

Replacement Considerations

Direct replacements within the same package and pinout include other LTC2654 variants such as LTC2654BCUF-L16#PBF for commercial temperature ranges or LTC2654BIUF-H16#PBF if the higher voltage full-scale option is preferred. Cross-family replacements like the LTC2655 offer I2C interfaces instead of SPI, requiring schematic modifications.