LTC2640ITS8-LZ12#TRPBF

Overview

The LTC2640ITS8-LZ12#TRPBF is a single-channel, 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. 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 serial interface with clock rates up to 50MHz. Key electrical parameters include a maximum integral nonlinearity (INL) of ±2.5 LSB, a typical settling time of 4.1µs at 3V, and a supply current of 180µA at 3V. The part incorporates a power-on reset circuit that defaults the output to zero-scale.

Feature Summary

• Integrated 10ppm/°C precision reference with 2.5V full-scale output
• 12-bit resolution with ±2.5 LSB maximum INL error
• Power-on reset to zero-scale for consistent system initialization
• Low power operation: 180µA supply current at 3V

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 as defined in the manufacturer's 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 hardware option for power-on reset to zero-scale rather than mid-scale.

Selection Notes

Select this component when a 12-bit resolution with low integral nonlinearity is required alongside an integrated reference source. The LTS8 package offers a compact footprint suitable for space-constrained designs. Consider the 2.7V to 5.5V supply range compatibility with standard logic levels. Verify that the zero-scale power-on reset behavior aligns with the safety requirements of the downstream analog circuitry during startup sequences.

Part Context

This part belongs to the LTC2640 family of single-channel DACs available in 8-, 10-, and 12-bit resolutions. The family shares a common 8-lead TSOT-23 package and SPI interface architecture. Variations within the family differ primarily by resolution accuracy grades (e.g., LTC2640A vs standard), full-scale voltage options (2.5V or 4.096V), and power-on reset configurations (zero or mid-scale).

Replacement Considerations

Direct pin-compatible replacements within the same family include the LTC2640ITS8-HZ12#TRPBF for a 4.096V full-scale output or the LTC2640ITS8-LM12#TRPBF for a mid-scale power-on reset. Cross-family replacements require verification of interface compatibility and pinout alignment.