LTC2640HTS8-LZ8#TRPBF

Overview

The LTC2640HTS8-LZ8#TRPBF is a single-channel, 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It integrates a high-accuracy reference with a temperature coefficient of ±10ppm/°C and a full-scale output of 2.5V. The device operates on a single supply ranging from 2.7V to 5.5V and features a rail-to-rail output buffer guaranteed monotonic over the operating temperature range. Communication is handled via a 3-wire SPI/MICROWIRE compatible serial interface supporting clock rates up to 50MHz. This specific variant includes an asynchronous DAC Clear pin (Pin 8) and resets to zero-scale upon power-up.

Feature Summary

• Integrated precision reference providing a 2.5V full-scale output with ±10ppm/°C drift
• Asynchronous hardware clear input (CLR) for immediate zero-scale reset
• Power-on reset circuitry configured to initialize outputs to zero-scale
• Low power consumption of 180µA at 3V with power-down mode reducing current to 1.8µA maximum

Applications

• Mobile communications systems
• Process control and industrial automation
• Automatic test equipment
• Portable battery-powered equipment
• Automotive electronic modules

Procurement Notes

Verify that the component matches the specified 8-bit resolution and 'L' grade for 2.5V full-scale operation. Confirm the presence of the CLR pin on Pin 8, which distinguishes this part from the REF_SEL variant. Ensure the package type is 8-lead TSOT-23 and check the manufacturing date code against current lifecycle status to confirm availability.

Selection Notes

Select this model when a hardware-controlled reset to zero-voltage is required during system initialization or fault conditions. The 8-bit resolution is suitable for applications where cost and pin count are prioritized over high precision. Verify that the 2.5V internal reference range meets the system's output requirements; otherwise, consider the 'H' grade for 4.096V or the 'M' suffix if software-based reference selection is preferred.

Part Context

This component belongs to the LTC2640 family of single-channel DACs available in 8-, 10-, and 12-bit resolutions. The 'L' designation indicates a 2.5V full-scale output derived from the internal reference, while the 'Z' suffix specifies the inclusion of the asynchronous Clear pin and zero-scale power-on reset behavior. It shares the same 8-lead TSOT-23 footprint as other variants in the series.

Replacement Considerations

Direct functional replacements within the same package include other LTC2640 variants such as the LTC2640HTS8-LZ10#TRPBF or LTC2640HTS8-LZ12#TRPBF, provided the lower or higher resolution is acceptable. For external reference configurations, the LTC2640HTS8-LM8#TRPBF serves as a comparable alternative without the hardware clear feature.