LTC2656IUFD-L12#PBF

Overview

The LTC2656IUFD-L12#PBF is an octal, 12-bit rail-to-rail digital-to-analog converter (DAC) from Analog Devices. It features a precision integrated reference with a maximum temperature coefficient of 10ppm/°C and operates on a single supply voltage ranging from 2.7V to 5.5V. The device provides a full-scale output of 2.5V in internal reference mode. Each channel includes high-performance, rail-to-rail output buffers that are 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. The component is housed in a 20-lead 4mm × 5mm plastic QFN package.

Feature Summary

• Octal architecture with eight independent 12-bit DAC channels
• Precise integrated reference with ±10ppm/°C maximum temperature coefficient
• Rail-to-rail output buffers guaranteed monotonic over temperature
• Ultralow crosstalk between DACs (<1nV•s typical)
• 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' confirms lead-free compliance and tube packaging for this part number. Confirm the 'I' grade designation matches the required industrial temperature range of –40°C to 85°C. Ensure the 'L12' suffix corresponds to the 2.5V full-scale output and 12-bit resolution specifications. Cross-reference the manufacturer's current documentation for any updates regarding RoHS status or end-of-life notices.

Selection Notes

Select the LTC2656IUFD-L12#PBF when eight simultaneous analog outputs are required with 12-bit resolution. Choose this variant over the -H option if the system operates within the 2.7V to 5.5V supply range and requires a 2.5V full-scale output. Consider the external reference capability if a different full-scale voltage is needed, as the output span becomes two times the external reference voltage. Verify that the 20-lead QFN package fits the PCB footprint constraints.

Part Context

This component belongs to the LTC2656 family of octal DACs, which also includes 16-bit variants and options with higher full-scale voltages. The 'IUFD' designation indicates the Industrial temperature grade (-40°C to 85°C) and the 20-lead QFN package. The 'L12' suffix specifies the 2.5V full-scale output derived from the internal reference and the 12-bit resolution. This distinguishes it from the 'H12' variant which offers a 4.096V output range.

Replacement Considerations

Direct replacements within the same family include the LTC2656CUFD-L12#PBF for commercial temperature ranges or the LTC2656IUFD-H12#PBF for 4.096V full-scale requirements. For 16-bit resolution needs, the LTC2656IUFD-L16#PBF is available. Ensure pin compatibility and thermal pad soldering requirements are met when substituting.