LTC2640CTS8-LZ8#TRPBF

Overview

The LTC2640CTS8-LZ8#TRPBF is a single-channel, 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features an integrated precision reference providing a 2.5V full-scale output and operates on a single 2.7V to 5.5V supply. The device utilizes a 3-wire SPI/MICROWIRE compatible interface with clock rates up to 50MHz. Key electrical specifications include a maximum integral nonlinearity (INL) of ±0.5 LSB, a typical settling time of 3.2µs at 3V, and a supply current of 180µA at 3V. It 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
• Asynchronous DAC Clear pin (Pin 8) for immediate zero-scale reset
• Power-on reset to zero-scale ensuring consistent system initialization
• Rail-to-rail output buffer guaranteed monotonic over temperature

Applications

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

Procurement Notes

Verify the specific suffix #TRMPBF versus #TRPBF in official documentation, as packaging quantities may vary by region or distributor channel. Confirm the C-grade commercial temperature range (0°C to 70°C) aligns with the target application environment requirements before finalizing procurement.

Selection Notes

Select this part for applications requiring low power consumption and a guaranteed zero-state upon power-up. The 8-bit resolution limits precision compared to 10- or 12-bit variants; ensure the ±0.5 LSB INL specification meets the system accuracy needs. Verify that the 2.5V internal reference span is sufficient for the downstream signal requirements.

Part Context

This component belongs to the LTC2640 family of single-channel SPI DACs. The 'CTS8' designation indicates the Commercial temperature grade and TSOT-23 package. The 'LZ8' suffix specifies the 2.5V full-scale voltage, Zero-scale power-on reset behavior, and 8-bit resolution. This distinguishes it from 'H' grade automotive parts and 'M' grade mid-scale reset variants.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Designers should consult Analog Devices marketing for information on non-standard lead-based finish parts or equivalent families within the LTC263x series if interface compatibility differs.