LTC2640ITS8-LZ8#TRMPBF

Overview

The LTC2640ITS8-LZ8#TRMPBF 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 supply voltage ranging from 2.7V to 5.5V. The device includes a rail-to-rail output buffer guaranteed monotonic over temperature. Key electrical parameters include a maximum integral nonlinearity (INL) of ±0.5 LSB, a settling time of 3.2µs at 3V, and a typical supply current of 180µA at 3V. It utilizes a 3-wire SPI/MICROWIRE compatible serial interface with clock rates up to 50MHz. The part incorporates a power-on reset circuit that clears the output to zero-scale upon power-up.

Feature Summary

• Integrated 10ppm/°C precision reference with 2.5V full-scale output
• Asynchronous DAC Clear pin (Pin 8) for immediate zero-scale reset
• Power-on reset to zero-scale ensures consistent system initialization
• Low power operation: 180µA typical supply current at 3V

Applications

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

Procurement Notes

Verify the specific suffix #TRMPBF indicates a 500-piece tape and reel packaging quantity as defined in the datasheet ordering information. Confirm the 'I' grade corresponds to the industrial temperature range of –40°C to 85°C. Ensure the 'Z' suffix is recognized as providing the asynchronous clear function and zero-scale power-on reset behavior distinct from the 'M' grade variants.

Selection Notes

Select this 8-bit variant when lower resolution requirements allow for reduced component count and cost compared to the 10- or 12-bit versions. The LTS8 package is suitable for space-constrained designs requiring surface mount installation. Choose this part if the application demands a guaranteed zero-state output immediately after power-up via the CLR pin or internal reset logic, rather than a mid-scale default.

Part Context

This component 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 but differs in accuracy grades, reset behaviors, and full-scale voltage options (2.5V for L-grade, 4.096V for H-grade). The ITS8 designation specifically identifies the Industrial temperature grade with the ThinSOT-23 package.

Replacement Considerations

Direct functional replacements within the same family include LTC2640ITS8-LZ10#TRMPBF (10-bit) or LTC2640ITS8-LZ12#TRMPBF (12-bit) if higher resolution is acceptable. For external reference applications, verify compatibility with other LTC2640 variants sharing the SPI interface and pinout.