LTC2656BCUFD-H16#PBF

Overview

The LTC2656BCUFD-H16#PBF is an octal, 16-bit rail-to-rail digital-to-analog converter (DAC) family member from Analog Devices. It features a precision integrated reference with a maximum temperature coefficient of 10ppm/°C and guarantees monotonicity over the operating temperature range. 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. Each channel includes high-performance, rail-to-rail output buffers designed for ultralow crosstalk between DACs.

Feature Summary

• Octal architecture with 8 independent 16-bit channels
• Precision integrated reference with ±10ppm/°C max temperature coefficient
• Rail-to-rail output buffers guaranteed monotonic over temperature
• 4-wire SPI/MICROWIRE compatible serial interface with 50MHz clock rate

Applications

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

Procurement Notes

Verify the specific suffix 'H16' corresponds to the 4.096V full-scale output and 4.5V-5.5V supply requirement. Confirm the 'BCUF' designation matches the commercial temperature grade (0°C to 70°C), ±4LSB maximum INL accuracy, and 20-lead QFN package type. Ensure the '#PBF' indicates lead-free construction as per manufacturer specifications.

Selection Notes

Select this component if eight simultaneous high-resolution analog outputs are required within a compact footprint. The H-option is necessary for applications demanding a 4.096V output span, whereas L-options provide 2.5V spans. Verify that the system power supply remains within the 4.5V to 5.5V range to ensure specified performance. Consider the external reference mode if a different full-scale voltage is needed, as the DAC supports inputs up to VCC/2.

Part Context

This part belongs to the LTC2656 family of octal DACs, which also includes 12-bit variants and devices with lower accuracy grades (C-grade). The BCUF variant specifically denotes the B-grade accuracy (±4LSB INL), commercial temperature range, and QFN packaging. Other family members like the LTC2656BIUFD-H16 offer industrial temperature ranges (-40°C to 85°C) while maintaining similar electrical characteristics.

Replacement Considerations

Direct replacements include other LTC2656 variants with matching resolution and package, such as LTC2656BIUFD-H16#PBF for industrial temperature operation. For fewer channels, consider the LTC2654 or LTC2655 quad/dual DAC families. Ensure any substitute maintains the 4.5V minimum supply voltage and 16-bit resolution requirements.