LTC2640CTS8-LM8#TRPBF

Overview

The LTC2640CTS8-LM8#TRPBF 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 specifications include a maximum integral nonlinearity (INL) error of ±0.5 LSB, a typical settling time of 3.2µs at 3V, and a supply current of 180µA at 3V. It incorporates a power-on reset circuit that defaults the output to mid-scale.

Feature Summary

• Integrated 2.5V Full-Scale Reference: Provides a stable 10ppm/°C internal reference for consistent performance without external components.
• High Accuracy Linearity: Achieves a maximum INL error of ±0.5 LSB and DNL of ±0.5 LSB, ensuring precise analog output generation.
• Low Power Consumption: Operates with a typical supply current of 180µA at 3V and reduces to 1.8µA maximum in power-down mode.
• Rail-to-Rail Output Buffer: Features a guaranteed monotonic output buffer capable of driving loads directly.

Applications

• Mobile Communications
• Process Control and Industrial Automation
• Automatic Test Equipment
• Portable Equipment
• Automotive Systems

Procurement Notes

Verify the specific ordering suffix #TRPBF indicates a 2,500-piece tape and reel packaging configuration. Confirm the temperature grade 'C' aligns with commercial operating requirements (0°C to 70°C). Ensure the lead-free designation matches environmental compliance standards required for the target assembly process.

Selection Notes

Select this part when an 8-bit resolution is sufficient for the application's accuracy needs. The LM suffix indicates a mid-scale power-on reset, which is suitable if downstream circuits can tolerate a non-zero initial state. Choose this over the LZ variant if zero-scale initialization is not required. Verify that the 2.5V full-scale range meets the input requirements of subsequent stages.

Part Context

This component belongs to the LTC2640 family of single-channel DACs available in 8-, 10-, and 12-bit resolutions. The family shares a common 8-lead TSOT-23 package and SPI interface architecture. Variations within the family differ primarily in resolution, full-scale voltage options (2.5V or 4.096V), and power-on reset behavior (mid-scale vs. zero-scale).

Replacement Considerations

Direct pin-compatible replacements within the same family include LTC2640CTS8-LZ8#TRPBF (zero-scale reset) and LTC2640ACTS8-LM8#TRPBF (higher accuracy grade). Cross-family replacements like the LTC2631 series offer I2C interfaces instead of SPI and require interface adaptation.