LTC2657CUFD-H12#PBF

Overview

The LTC2657CUFD-H12#PBF is an octal, 12-bit rail-to-rail digital-to-analog converter (DAC) from Analog Devices. It features an integrated reference providing a full-scale output of 4.096V and operates on a single 4.5V to 5.5V supply. The device utilizes a 2-wire I²C compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. Key electrical characteristics include a maximum integral nonlinearity (INL) error of ±1 LSB, guaranteed monotonicity over temperature, and ultralow DAC-to-DAC crosstalk of 0.8nV·s. It incorporates integrated reference buffers and a power-on reset circuit configurable for zero-scale or mid-scale initialization.

Feature Summary

• Octal architecture with 12-bit resolution and rail-to-rail buffered outputs
• Integrated 4.096V full-scale reference with 10ppm/°C max drift
• Maximum INL error of ±1 LSB and guaranteed monotonic operation
• Ultralow crosstalk between channels (0.8nV·s typical)

Applications

• Mobile communications systems
• Process control and industrial automation
• Instrumentation equipment
• Automatic test equipment
• Automotive electronics

Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm package type, temperature grade, and lead finish. Ensure the internal reference voltage option matches the system requirements, as the H-option requires a 4.5V to 5.5V supply range. Confirm that the QFN-20 package thermal pad soldering guidelines are followed during assembly to maintain reliability.

Selection Notes

Select this component when multiple low-cost, high-density DAC channels are required in a compact footprint. The H-option is suitable for applications needing a 4.096V output span without external reference components. Consider the L-option if a lower supply voltage (2.7V) or 2.5V output span is preferred. Verify that the I²C bus speed and address configuration via CA pins meet the system controller's capabilities.

Part Context

This part belongs to the LTC2657 family of octal DACs, which also includes 16-bit variants and TSSOP package options. The CUFD designation indicates the Commercial temperature grade (0°C to 70°C) and the 20-Lead (4mm × 5mm) Plastic QFN package. The H12 suffix specifies the 4.096V full-scale internal reference and 12-bit resolution.

Replacement Considerations

Direct pin-compatible replacements within the same family include the LTC2657IUFD-H12#PBF for industrial temperature range (-40°C to 85°C) or the LTC2657BCUFD-H12#PBF for tighter linearity specifications (±4LSB INL). Other families like the LTC2655 offer similar functionality but may differ in channel count or interface.