LTC2655BCUF-L16#PBF

Overview

The LTC2655BCUF-L16#PBF is a quad, 16-bit rail-to-rail digital-to-analog converter (DAC) from Analog Devices. It features an integrated 10ppm/°C maximum reference with a full-scale output of 2.5V and operates on a single 2.7V to 5.5V supply. The device includes high-performance output buffers guaranteed monotonic over temperature. It utilizes a 2-wire I²C compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. Key electrical specifications include ±4LSB maximum INL, ±0.3LSB DNL, and a settling time of 9.1µs for 16-bit accuracy.

Feature Summary

• Quad 16-bit resolution with ±4LSB maximum integral nonlinearity (INL)
• Integrated 10ppm/°C reference providing 2.5V full-scale output
• Rail-to-rail output buffers with ultralow crosstalk (<1nV•s)
• Selectable power-on reset 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 tube packaging rather than tape and reel. Confirm the 'B' grade designation corresponds to the ±4LSB INL specification required for the application. Ensure the 'L' suffix matches the 2.5V internal reference requirement instead of the 4.096V option.

Selection Notes

Select this part when four independent 16-bit voltage outputs are needed in a compact QFN package. The -L variant is appropriate for systems requiring a 2.5V span powered by a single supply between 2.7V and 5.5V. Choose the -B grade if tighter linearity specifications than the standard C-grade are necessary for precision measurement tasks.

Part Context

This component belongs to the LTC2655 family of quad DACs. It shares the same pinout and interface as other variants but differs in resolution, accuracy grade, and internal reference voltage. The UF package denotes the 20-lead 4mm × 4mm plastic QFN form factor, distinct from the 16-lead SSOP GN package used in other family members.

Replacement Considerations

Public confirmed substitute part numbers: LTC2655BIUF-L16#PBF (Industrial temperature grade), LTC2655BCUF-H16#PBF (4.096V reference).

FAQ

What is the function of the PORSEL pin?

The PORSEL pin controls the power-on reset state. Tying it to GND resets the DAC outputs to zero-scale, while tying it to VCC resets them to mid-scale.

How does the internal reference affect the output range?

In internal reference mode, the -L options provide a full-scale output of 2.5V. The output span can also be set to 2 times the external reference voltage if an external reference is used.

What is the maximum clock rate for the I²C interface?

The LTC2655 supports both standard mode with a maximum clock rate of 100kHz and fast mode with a maximum clock rate of 400kHz.