LTC2657CUFD-L12#PBF

Overview

The LTC2657CUFD-L12#PBF is an octal 12-bit digital-to-analog converter (DAC) from Analog Devices, housed in a 20-lead 4mm × 5mm plastic QFN package. It features integrated rail-to-rail output buffers and a precision internal reference with a maximum temperature coefficient of 10ppm/°C. The device operates on a single 2.7V to 5.5V supply and utilizes a 2-wire I²C compatible serial interface supporting standard (100kHz) and fast (400kHz) modes. 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 12-bit accuracy.

Feature Summary

• Octal architecture providing eight independent 12-bit DAC channels in a compact 20-lead QFN package
• Integrated high-performance rail-to-rail output buffers with ultralow crosstalk (0.8nV•s)
• Precision internal reference with 10ppm/°C max temperature coefficient and selectable external reference input
• Power-on reset circuit configurable via PORSEL pin to initialize outputs to zero-scale or mid-scale

Applications

• Mobile communications systems requiring multi-channel signal generation
• Process control and industrial automation instrumentation
• Automatic test equipment needing precise voltage references
• Automotive electronic control units

Procurement Notes

Verify the specific ordering suffix '#PBF' confirms lead-free construction and tube packaging as indicated in the manufacturer's order information table. Confirm that the 'C' grade designation aligns with the required commercial operating temperature range of 0°C to 70°C for the target application environment.

Selection Notes

Select this component when eight isolated voltage outputs are required within space-constrained designs. The -L option provides a 2.5V full-scale output suitable for 2.7V to 5.5V single-supply systems. Ensure the I²C bus speed requirements do not exceed 400kHz and verify that the ±1 LSB INL specification meets the system linearity constraints.

Part Context

This part belongs to the LTC2657 family of octal DACs, which also includes 16-bit variants and industrial temperature grade (-I) options. The CUFD suffix specifically denotes the commercial grade version in the 20-lead QFN package, distinguishing it from the thermally enhanced TSSOP (FE) package or tape-and-reel (TR) shipping configurations.

Replacement Considerations

Direct functional substitutes within the same family include the LTC2657IUFD-L12#PBF for extended temperature ranges or the LTC2657BCUFD-L12#PBF for tighter linearity specifications. Cross-package replacements such as the LTC2657CFE-L12#PBF require schematic adjustments for the TSSOP footprint.