LTC2657CFE-L12

Overview

The LTC2657CFE-L12 is an octal digital-to-analog converter (DAC) featuring 12-bit resolution and I2C serial interface. It integrates four internal voltage references with a maximum temperature coefficient of 10ppm/°C, eliminating the need for external reference components. The device provides rail-to-rail buffered voltage outputs across eight channels, ensuring high precision and stability. Key electrical parameters include a settling time of 9.1 µs, a DNL of ±0.3 LSB, and an INL of ±2 LSB. It operates within a supply voltage range of 4.5 V to 5.5 V and consumes 3.1 mA of working power. The component is housed in a TSSOP-20 package and supports an operating temperature range from -40°C to +85°C.

Feature Summary

• Octal architecture with eight independent 12-bit DAC channels
• Integrated internal voltage references with 10ppm/°C max temperature coefficient
• Rail-to-rail buffered voltage outputs for direct drive capability
• I2C compatible 2-wire serial interface for simplified connectivity

Applications

• Multi-channel data acquisition systems requiring precise voltage generation
• Industrial process control loops with multiple sensor interfaces
• Test and measurement equipment needing stable analog output sources
• Automotive electronics utilizing robust DAC solutions for actuator control

Procurement Notes

Verify the specific suffix L12 confirms the inclusion of integrated internal references as opposed to H variants which may require external references. Confirm the CFE package designation corresponds to the TSSOP-20 form factor. Ensure compatibility with the target I2C bus speed and address configuration before integration into the design.

Selection Notes

Select this model when eight simultaneous analog outputs are required without external reference circuitry. Compare against the LTC2655 series if fewer channels or different packaging is preferred. Verify that the 12-bit resolution meets the system accuracy requirements, noting the ±2 LSB INL specification. Consider the 9.1 µs settling time for applications demanding faster update rates.

Part Context

This component belongs to the LTC2657 family of octal DACs, designed for high-channel-count applications. It shares architectural similarities with the LTC2655 quad DAC but offers double the channel density. The part is manufactured by Analog Devices Inc., a leader in signal processing technologies. Development tools such as the DC1529A demo board are available for evaluating performance characteristics during the design phase.

Replacement Considerations

Direct substitutes within the same family include the LTC2657BIFE-L12#PBF for higher grade specifications. For quad-channel requirements, the LTC2655CGN-L12#TRPBF serves as a functional alternative with reduced channel count. Ensure pinout compatibility when transitioning between TSSOP-20 and SSOP-16 packages.