LTC2634IUD-LZ8#PBF

Overview

The LTC2634IUD-LZ8#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 utilizes a 3-wire SPI/MICROWIRE compatible serial interface with clock rates up to 50MHz. It includes rail-to-rail output buffers, guaranteed monotonicity over the -40°C to 85°C industrial temperature range, and a power-on reset circuit that clears outputs to zero-scale upon initialization.

Feature Summary

• Quad 8-bit DACs with integrated 10ppm/°C precision reference
• Rail-to-rail output buffers with ultralow crosstalk (2.4nV•s)
• SPI/MICROWIRE compatible 3-wire serial interface operating at 50MHz
• Power-on reset to zero-scale for consistent system initialization

Applications

• Mobile communications
• Process control and industrial automation
• Automatic test equipment
• Portable equipment
• Automotive applications

Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and confirm the I-grade designation corresponds to the required -40°C to 85°C industrial operating temperature range. Ensure the QFN package footprint matches the PCB layout specifications provided in the datasheet.

Selection Notes

Select this part for designs requiring four independent 8-bit channels with low power consumption and high accuracy. The LZ8 suffix ensures outputs initialize to zero-volts, which is critical for protecting downstream circuits during power-up sequences compared to mid-scale reset options.

Part Context

This component belongs to the LTC2634 family, which offers variations in resolution (8, 10, or 12 bits), full-scale voltage (2.5V or 4.096V), and power-on reset behavior. The IUD-LZ8 variant specifically combines industrial temperature grading, QFN packaging, and zero-scale reset functionality.

Replacement Considerations

Direct replacements within the same family include other LTC2634 variants with different resolutions or reset behaviors. For pin-compatible alternatives with different interfaces, consider the LTC2635 series, which uses an I2C interface instead of SPI.