LTC2640ITS8-HZ8#TRPBF

Overview

The LTC2640ITS8-HZ8#TRPBF is a single-channel, 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features an integrated precision reference with a full-scale output of 2.5V and operates on a single 2.7V to 5.5V supply. The device includes 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 specifications include a typical settling time of 3.2µs at ±1LSB for 8-bit resolution, a supply current of 180µA at 3V, and power-down current of 1.8µA maximum. The part incorporates a power-on reset circuit that defaults the output to zero-scale.

Feature Summary

• Integrated 10ppm/°C precision reference providing a 2.5V full-scale output
• Asynchronous DAC Clear pin (Pin 8) for immediate zero-scale reset
• Power-on reset to zero-scale ensuring consistent system initialization
• Low power operation: 180µA typical supply current; 1.8µA max in power-down

Applications

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

Procurement Notes

Verify the specific suffix #TRPBF indicates a 2,500-piece tape and reel packaging configuration. Confirm the 'I' grade designation corresponds to the industrial temperature range of –40°C to 85°C. Ensure the 'Z' suffix is recognized as the variant with the asynchronous clear function and zero-scale power-on reset behavior. Cross-reference the manufacturer's ordering information for lead finish details.

Selection Notes

Select this component when an 8-bit resolution is sufficient for the application requirements. The 'H' suffix mandates a supply voltage between 4.5V and 5.5V for the 4.096V full-scale option, but the 'L' suffix supports 2.7V to 5.5V for the 2.5V full-scale option; verify the specific internal reference voltage required. Choose the 'Z' suffix if hardware-based asynchronous clearing to zero is needed. The 'I' grade is suitable for environments requiring operation down to –40°C.

Part Context

This part belongs to the LTC2640 family of single-channel SPI DACs available in 8-, 10-, and 12-bit resolutions. The family shares a common 8-lead TSOT-23 package and core architecture. Variations exist based on accuracy grades (standard vs. A-grade), power-on reset behavior (Mid-Scale vs. Zero), and full-scale voltage options (2.5V vs. 4.096V). This specific model combines 8-bit resolution with the industrial temperature grade and zero-scale reset functionality.

Replacement Considerations

Direct functional substitutes within the same family include LTC2640ITS8-LZ8#TRPBF (if 2.7V–5.5V supply is preferred) or LTC2640ITS8-HM8#TRPBF (if mid-scale reset is acceptable). For higher resolution needs, consider LTC2640ITS8-HZ10#TRPBF or LTC2640ITS8-HZ12#TRPBF. Verify pin compatibility and software command set alignment when substituting.