LTC2640AITS8-LZ12#TRPBF

Overview

The LTC2640AITS8-LZ12#TRPBF is a single-channel, 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices Inc. It features an integrated precision reference providing a full-scale output of 2.5V with a temperature coefficient of 10ppm/°C. The device operates on a single supply ranging from 2.7V to 5.5V and includes a rail-to-rail output buffer guaranteed monotonic over temperature. It utilizes a 3-wire SPI/MICROWIRE compatible interface with clock rates up to 50MHz. Key specifications include a maximum integral nonlinearity error of ±1LSB, low power consumption of 180µA at 3V, and a power-down current of 1.8µA maximum. The part incorporates a power-on reset circuit that defaults the output to zero-scale.

Feature Summary

• 12-bit resolution with ±1LSB maximum INL error
• Integrated 2.5V full-scale reference with 10ppm/°C drift
• Asynchronous DAC Clear pin for zero-scale reset
• Power-on reset to zero-scale option

Applications

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

Procurement Notes

Verify the ordering suffix #TRPBF indicates a tape and reel quantity of 2,500 pieces. Confirm the LTS8 package designation corresponds to the 8-lead plastic TSOT-23 form factor. Ensure the A grade specification for ±1LSB INL matches system accuracy requirements. Check that the LZ12 suffix correctly identifies the zero-scale power-on reset and 2.5V internal reference configuration.

Selection Notes

Select this component when a 12-bit resolution with high accuracy (±1LSB INL) is required in a compact 8-lead TSOT-23 package. The internal 2.5V reference eliminates external components if this voltage range suits the application. Choose the LZ variant if a known zero-state output upon power-up is necessary for system safety or initialization. Verify supply voltage compatibility, as the L-grade supports 2.7V to 5.5V operation.

Part Context

This part belongs to the LTC2640 family of single DACs available in 8-, 10-, and 12-bit resolutions. The 'A' suffix denotes the highest accuracy grade with ±1LSB INL. The 'L' indicates a 2.5V full-scale output derived from an internal reference, suitable for lower voltage systems compared to the 'H' grade which offers 4.096V. The 'Z' specifies the asynchronous clear and zero-scale power-on reset functionality, distinguishing it from the 'M' grade which resets to mid-scale.

Replacement Considerations

Direct replacements within the same family include LTC2640AITS8-LM12#TRPBF for mid-scale reset or LTC2640AITS8-HZ12#TRPBF for 4.096V full-scale output. Cross-family replacements require verification of pinout compatibility and electrical parameter alignment, particularly regarding supply voltage ranges and reference configurations.