LTC2657IUFD-H12#PBF

Overview

The LTC2657IUFD-H12#PBF is an octal, 12-bit digital-to-analog converter (DAC) featuring a high-precision integrated reference with a maximum temperature coefficient of 10ppm/°C. It utilizes a 2-wire I²C compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. The device incorporates rail-to-rail output buffers and is guaranteed monotonic over the operating temperature range. Designed for industrial applications, it operates from a single 4.5V to 5.5V supply when using the internal reference, which sets the full-scale output to 4.096V. Alternatively, an external reference can be used to set the full-scale output to twice the external voltage.

Feature Summary

• Octal architecture with 8 independent 12-bit DAC channels
• Integrated precision reference with 10ppm/°C max temperature coefficient
• Rail-to-rail output buffers with ultralow crosstalk (0.8nV•s)
• I²C interface with selectable power-on reset to zero-scale or mid-scale

Applications

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

Procurement Notes

Verify the specific ordering suffix H12 corresponds to the 12-bit resolution and 4.096V full-scale internal reference configuration. Confirm the UFD package designation matches the required 20-lead QFN form factor. Ensure the I temperature grade meets the system's operational requirements of –40°C to +85°C. Cross-reference the datasheet specifications for load regulation and settling time against application constraints.

Selection Notes

Select this component when multiple low-channel-count DACs are needed in a compact footprint. The H-option is suitable for applications requiring a 4.096V output span without external reference components. Consider the L-option if a lower supply voltage range (2.7V to 5.5V) and 2.5V full-scale output are preferred. Verify that the I²C bus speed and address pin configurations (CA0-CA2) align with the system controller capabilities.

Part Context

This part belongs to the LTC2657 family of octal DACs, which also includes 16-bit variants and commercial temperature grade options. The IUFD suffix indicates the Industrial temperature grade (-40°C to 85°C) and the 20-lead QFN package. Other family members include the LTC2656 (no I²C) and LTC2655 (Quad channel), offering different channel counts and interface options within the same performance class.

Replacement Considerations

Direct replacements within the same package and pinout include other LTC2657 variants such as the LTC2657IUFD-L12#PBF for lower voltage operation or LTC2657BIUFD-H12#PBF for tighter linearity specs. For non-I²C interfaces, the LTC2656 series may serve as a functional alternative if the communication protocol differs.