LTC2640CTS8-LM12#TRPBF

Overview

The LTC2640CTS8-LM12#TRPBF is a single-channel, 12-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 incorporates a rail-to-rail output buffer guaranteed monotonic over temperature. It utilizes a 3-wire SPI/MICROWIRE compatible serial interface with clock rates up to 50MHz. Key electrical specifications include a typical settling time of 4.1µs for 12-bit accuracy, a maximum integral nonlinearity (INL) error of ±2.5 LSB, and a power supply current of 180µA at 3V. The component is housed in an 8-lead TSOT-23 package.

Feature Summary

• Integrated 10ppm/°C precision reference with 2.5V full-scale output
• Rail-to-rail output buffer guaranteed monotonic over temperature
• SPI/MICROWIRE compatible 3-wire serial interface operating up to 50MHz
• Power-on reset to mid-scale with double-buffered data latches

Applications

• Mobile communications systems
• Process control and industrial automation
• Automatic test equipment
• Portable battery-powered equipment
• Optical networking devices

Procurement Notes

Verify the specific ordering suffix #TRPBF corresponds to the required tape and reel quantity, as the datasheet indicates TRMPBF denotes a 500-piece reel while TR typically denotes 2,500 pieces. Confirm that the C-grade temperature range (0°C to 70°C) meets the operational requirements, noting that I and H grades are available for wider ranges. Ensure the pin configuration matches the standard TS8 package layout provided in the official documentation.

Selection Notes

Select this part when a 12-bit resolution with an internal 2.5V reference is required in a compact 8-lead TSOT-23 package. The LM suffix indicates a power-on reset to mid-scale; choose the LZ suffix if a zero-scale reset is preferred. Verify that the 2.7V to 5.5V supply range aligns with the system design, as the H-grade variants require a minimum of 4.5V for the 4.096V full-scale option. Consider the 180µA active current consumption against low-power standby requirements.

Part Context

This component belongs to the LTC2640 family of single-channel DACs, which also includes 10-bit and 8-bit variants. The family shares common architectural features such as the SPI interface and integrated reference options. The LTS8 package designation refers to the 8-lead plastic TSOT-23 form factor. Other members of the series include the LTC2640A for higher accuracy and different temperature grades like I and H for extended operating ranges.

Replacement Considerations

Direct replacements within the same family include the LTC2640CTS8-LZ12#TRPBF for a zero-scale power-on reset or the LTC2640AHTS8-LM12#TRPBF for improved linearity accuracy. For external reference applications, the LTC2640CTS8-HM12#TRPBF provides a 4.096V full-scale output but requires a higher minimum supply voltage of 4.5V.