LTC2657CUFD-L12#TRPBF

Overview

The LTC2657CUFD-L12#TRPBF is an octal 12-bit digital-to-analog converter (DAC) featuring a 2-wire I²C serial interface. It integrates a precision reference with a maximum temperature coefficient of 10ppm/°C and high-performance rail-to-rail output buffers. The device operates from a single 2.7V to 5.5V supply, providing a full-scale output of 2.5V in internal reference mode. It supports standard (100kHz) and fast (400kHz) I²C clock rates. Key electrical characteristics include a maximum integral nonlinearity (INL) error of ±1 LSB, guaranteed monotonicity over the operating temperature range, and ultralow crosstalk between channels at 0.8nV•s.

Feature Summary

• Octal architecture with eight independent 12-bit voltage output DACs
• Integrated precision reference with 10ppm/°C max temperature coefficient
• Rail-to-rail output buffers supporting 2.7V to 5.5V supply range
• 2-wire I²C compatible interface with selectable slave addresses via CA pins
• Power-on reset circuit configurable for zero-scale or mid-scale initialization

Applications

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

Procurement Notes

Verify the specific ordering suffix #TRPBF indicates tape and reel packaging configuration. Confirm the C-grade designation corresponds to the commercial temperature range of 0°C to 70°C. Ensure the L12 resolution code matches the required 12-bit performance specifications for the target design.

Selection Notes

Select this component when multiple low-channel-count DACs are required in a compact footprint. The -L option provides a 2.5V full-scale output suitable for 2.7V to 5.5V supplies. For designs requiring higher voltage swings, consider the -H variant which offers 4.096V full-scale output but requires a minimum 4.5V supply. External reference modes allow scaling up to twice the external reference voltage.

Part Context

This part belongs to the LTC2657 family of octal DACs, available in both 12-bit and 16-bit resolutions. The CUFD package denotes a 20-lead 4mm × 5mm plastic QFN form factor. The 'C' grade specifies commercial temperature operation, while 'I' grades cover industrial ranges. The L suffix indicates the 2.5V internal reference option, distinct from the H option's 4.096V reference.

Replacement Considerations

Direct pin-compatible replacements within the same family include the LTC2657IUFD-L12#TRPBF for industrial temperature range (-40°C to 85°C). For higher accuracy requirements, the B-grade variants such as LTC2657BCUFD-L12#TRPBF offer tighter linearity specifications. Verify that any substitute maintains the same QFN package dimensions and thermal pad requirements.