LTC2640ITS8-LZ12#TRMPBF

Overview

The LTC2640ITS8-LZ12#TRMPBF is a single-channel, 12-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 incorporates a rail-to-rail output buffer guaranteed monotonic over temperature. Key electrical parameters include a maximum integral nonlinearity (INL) error of ±2.5 LSB, a typical settling time of 4.1µs at 3V, and a supply current of 180µA at 3V. It utilizes a 3-wire SPI/MICROWIRE compatible serial interface with clock rates up to 50MHz and includes a power-on reset circuit that clears the output to zero-scale.

Feature Summary

• Integrated 10ppm/°C precision reference providing a 2.5V full-scale output
• 12-bit resolution with guaranteed monotonic operation over temperature
• Power-on reset to zero-scale for consistent system initialization
• Low power consumption: 180µA operating current and 1.8µA maximum in power-down mode

Applications

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

Procurement Notes

Verify the specific suffix #TRMPBF indicates a 500-piece tape and reel packaging configuration as defined in the datasheet ordering information. 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 asynchronous DAC clear functionality and zero-scale power-on reset behavior.

Selection Notes

Select this component when a compact 8-lead TSOT-23 package is required for space-constrained designs. Choose the LTC2640ITS8-LZ12 specifically for applications needing a 2.5V internal reference and zero-scale power-up state. Consider the H-grade or external reference variants if a 4.096V output span or extended temperature range beyond 85°C is necessary.

Part Context

This part belongs to the LTC2640 family of single-channel DACs available in 12-, 10-, and 8-bit resolutions. The family distinguishes between L-grades (2.5V FS, 2.7V–5.5V supply) and H-grades (4.096V FS, 4.5V–5.5V supply). Variants are differentiated by power-on reset behavior (M for mid-scale, Z for zero-scale) and accuracy grades (standard vs. A-grade with tighter INL specifications).

Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the source documentation.