LTC2656BIUFD-H16#PBF

Overview

The LTC2656BIUFD-H16#PBF is an octal 16-bit rail-to-rail digital-to-analog converter (DAC) from Analog Devices Inc. It features a precision integrated reference with a maximum temperature coefficient of 10ppm/°C, providing a full-scale output voltage of 4.096V. The device operates on a single 4.5V to 5.5V supply and includes high-performance output buffers guaranteed monotonic over the operating temperature range. 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 settling time of 7.9µs for 16-bit accuracy, and ultralow DAC-to-DAC crosstalk below 1nV•s.

Feature Summary

• Octal 16-bit resolution with ±4LSB maximum INL error
• Integrated 4.096V precision reference with 10ppm/°C max temperature coefficient
• Rail-to-rail output buffers with <1nV•s DAC-to-DAC crosstalk
• SPI/MICROWIRE compatible 4-wire serial interface with 50MHz clock rate

Applications

• Mobile Communications
• Process Control and Industrial Automation
• Instrumentation
• Automatic Test Equipment
• Automotive

Procurement Notes

Verify that the component matches the specified package type, which is a 20-lead 4mm × 5mm Plastic QFN (UFD). Confirm the electrical grade 'B' indicates a maximum INL of ±4LSB and the suffix 'H' denotes the 4.096V internal reference option requiring a 4.5V to 5.5V supply. Ensure the lead-free designation '#PBF' is present in the ordering information.

Selection Notes

Select this part when eight independent 16-bit voltage outputs are required within a compact footprint. The -H suffix is necessary for applications needing a 4.096V full-scale range, as opposed to the -L variant which provides 2.5V. The B-grade accuracy is suitable for systems demanding tight linearity constraints. Consider the external reference mode if a different full-scale voltage is needed, where the output span becomes two times the external reference voltage.

Part Context

This component belongs to the LTC2656 family of octal DACs, available in both 16-bit and 12-bit resolutions. The BIUFD-H16 designation specifically identifies the industrial temperature grade (-40°C to 85°C), the B-grade accuracy, the UFD QFN package, and the H-series 4.096V reference configuration. Other variants in the family include commercial grades and TSSOP packages.

Replacement Considerations

Direct substitutes within the same family include the LTC2656BCUFD-H16#PBF for commercial temperature range or the LTC2656IFE-H16#PBF for industrial grade in the TSSOP package. For 12-bit applications, the LTC2656IUFD-H12#PBF offers similar pinout and functionality with lower resolution.