LTC2634IUD-LMI8#PBF

Overview

The LTC2634IUD-LMI8#PBF is a quad 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 2.7V to 5.5V supply. The device includes rail-to-rail output buffers, guaranteed monotonicity over the -40°C to 85°C industrial temperature range, and low noise characteristics. Communication is handled via a 3-wire SPI/MICROWIRE compatible interface supporting clock rates up to 50MHz. Power-on reset defaults to mid-scale in internal reference mode.

Feature Summary

• Quad 8-bit resolution with ±0.5 LSB maximum INL error
• Integrated 10ppm/°C precision reference yielding 2.5V full-scale output
• Rail-to-rail output buffers with ultralow DAC-to-DAC crosstalk (2.4nV•s)
• Industrial temperature grade (-40°C to 85°C) in a 16-lead QFN package

Applications

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

Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and standard tube packaging for the QFN variant. Confirm the I-grade designation matches the required -40°C to 85°C operating range for the target application environment. Ensure the LMI8 configuration aligns with the need for mid-scale power-on reset behavior in internal reference mode.

Selection Notes

Select this part when four independent 8-bit channels are required within a compact footprint. The 2.5V full-scale range suits applications where lower voltage swings are sufficient. Consider the H-grade variants if operation up to 125°C is necessary, or the MSE package if MSOP form factor is preferred over QFN.

Part Context

This component belongs to the LTC2634 family, which offers 12-, 10-, and 8-bit resolutions. The IUD suffix denotes the Industrial temperature grade and 16-lead QFN package. The LMI8 code specifies the 2.5V full-scale voltage, Mid-Scale power-on reset, and 8-bit resolution configuration.

Replacement Considerations

Publicly confirmed substitutes include other members of the LTC2634 family such as LTC2634IUD-LMX8#PBF for external reference reset behavior, or LTC2634IUD-LZ8#PBF for zero-scale reset. Higher resolution options like LTC2634IUD-LMI10#PBF provide 10-bit accuracy in the same package.