LTC2657IUFD-L12#TRPBF

Overview

The LTC2657IUFD-L12#TRPBF is an octal 12-bit digital-to-analog converter (DAC) family member from Analog Devices, housed in a 20-lead 4mm × 5mm plastic QFN package. It features rail-to-rail output buffers and an integrated reference with a maximum temperature coefficient of 10ppm/°C. The device operates on a single supply voltage ranging from 2.7V to 5.5V, providing a full-scale output of 2.5V when using the internal reference. It supports both standard mode (100kHz) and fast mode (400kHz) I²C serial interfaces. Key electrical specifications include a maximum integral nonlinearity (INL) error of ±1 LSB, differential nonlinearity (DNL) of ±0.5 LSB, and a typical settling time of 3.9μs for a 1LSB step.

Feature Summary

• Octal architecture with eight independent 12-bit DAC channels in a compact 20-lead QFN package
• Integrated precision reference with 10ppm/°C max temperature coefficient and 2.5V full-scale output
• Rail-to-rail output buffers guaranteed monotonic over temperature with ultralow crosstalk (0.8nV•s)
• I²C compatible interface supporting 400kHz clock rates with selectable power-on reset states

Applications

• Mobile communications systems requiring multi-channel signal generation
• Process control and industrial automation instrumentation
• Instrumentation and data acquisition systems
• Automatic test equipment (ATE)
• Automotive electronic control units

Procurement Notes

Verify the specific ordering suffix #TRPBF confirms tape and reel packaging containing 2000 units per reel. Confirm the 'I' designation indicates the industrial temperature range of –40°C to 85°C. Ensure the 'L12' suffix corresponds to the 12-bit resolution and 2.5V full-scale voltage configuration. Cross-reference the manufacturer part number with official Analog Devices documentation to confirm lead-free status and RoHS compliance before procurement.

Selection Notes

Select this component when multiple low-cost, high-accuracy voltage outputs are required in a space-constrained design. The 12-bit resolution offers a balance between cost and performance for applications not requiring 16-bit precision. Consider the external reference option if a different full-scale voltage or higher stability than the integrated 10ppm/°C reference is needed. Verify that the 400kHz I²C speed meets the system's communication bandwidth requirements.

Part Context

This part belongs to the LTC2657 family of octal DACs, which also includes 16-bit variants (LTC2657B/LTC2657-16) and H-option parts with 4.096V full-scale outputs. The IUFD suffix denotes the 20-lead QFN package, while L12 specifies the 12-bit resolution and 2.5V internal reference setting. The TRPBF suffix indicates tape and reel packaging with lead-free finish.

Replacement Considerations

Direct pin-compatible replacements within the same family include LTC2657CUFD-L12#TRPBF (commercial grade) or LTC2657BIUFD-L12#TRPBF (higher accuracy grade). For 16-bit resolution, consider LTC2657IUFD-L16#TRPBF. External reference versions like LTC2657IUFD-H12#TRPBF offer 4.096V output but require a 4.5V minimum supply.