LTC2640ITS8-LM8#TRMPBF

Overview

The LTC2640ITS8-LM8#TRMPBF is a single-channel, 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features an integrated precision reference providing a full-scale output of 2.5V and operates on a single supply voltage ranging from 2.7V to 5.5V. The device utilizes a SPI/MICROWIRE compatible 3-wire serial interface with clock rates up to 50MHz. Key electrical characteristics include a typical supply current of 180µA at 3V, a settling time of 3.2µs for ±1LSB accuracy, and a maximum integral nonlinearity error of 0.5LSB. It incorporates a power-on reset circuit that initializes the output to mid-scale upon power-up.

Feature Summary

• Integrated 10ppm/°C precision reference with 2.5V full-scale output
• SPI/MICROWIRE compatible 3-wire serial interface supporting up to 50MHz clock
• Power-on reset to mid-scale configuration
• Low power operation: 180µA typical supply current at 3V

Applications

• Mobile communications
• Process control and industrial automation
• Automatic test equipment
• Portable equipment
• Optical networking

Procurement Notes

Verify the specific ordering suffix #TRMPBF indicates a 500-piece tape and reel packaging quantity as defined in the datasheet. Confirm the temperature grade 'I' corresponds to the industrial range of –40°C to 85°C. Ensure the lead finish matches the PBF designation for lead-free compliance. Cross-reference the manufacturer part number with official Analog Devices documentation to confirm availability and exact package specifications.

Selection Notes

Select this component when an 8-bit resolution is sufficient for the application requirements. The LM suffix indicates a mid-scale power-on reset, which may be suitable if downstream circuits can tolerate a non-zero initial state. For applications requiring zero-scale initialization, consider the LZ variant. Verify that the 2.5V internal reference range meets the system voltage requirements, as the H-grade variants offer 4.096V but require higher supply voltages.

Part Context

This part belongs to the LTC2640 family of single-channel DACs available in 12-, 10-, and 8-bit resolutions. The family shares common architectural features including the ThinSOT-23 package and SPI interface. Variants differ by resolution, power-on reset behavior (Zero vs. Mid-Scale), full-scale voltage (2.5V vs. 4.096V), and temperature grades (Commercial, Industrial, Automotive).

Replacement Considerations

Direct replacements within the same family include LTC2640ITS8-LZ8#TRMPBF for zero-scale reset or LTC2640ITS8-HM8#TRMPBF for higher voltage swing. Other Analog Devices single-channel SPI DACs in TSOT-23 packages may serve as alternatives if pin compatibility and performance metrics align.