LTC2634IUD-LMI12#PBF

Overview

The LTC2634IUD-LMI12#PBF is a quad 12-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 a maximum integral nonlinearity error of ±2.5 LSB. 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 12-bit resolution with integrated 10ppm/°C precision reference
• Rail-to-rail output buffers with ultralow crosstalk (2.4nV•s)
• SPI/MICROWIRE compatible 3-wire serial interface up to 50MHz
• Power-on reset to mid-scale in internal reference mode

Applications

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

Procurement Notes

Verify the package type matches the design requirements, as this part uses a 16-lead QFN. Confirm the temperature grade corresponds to the application environment, specifically the industrial range (-40°C to 85°C). Ensure the power-on reset behavior aligns with system initialization needs, as this variant resets to mid-scale. Check for any specific automotive qualification requirements if applicable, though this is an industrial grade part.

Selection Notes

Select this component when four independent 12-bit DAC channels are required in a compact footprint. The 2.5V full-scale output is suitable for low-voltage single-supply applications. Consider the external reference option if a different full-scale voltage is needed. Verify that the 50MHz serial interface speed meets the system data throughput requirements. Ensure the PCB layout accommodates the exposed ground pad for thermal management.

Part Context

This part belongs to the LTC2634 family, which offers 12-, 10-, and 8-bit resolutions in both 16-lead QFN and 10-lead MSOP packages. The 'I' suffix denotes the industrial temperature range, while 'UD' specifies the 16-lead QFN package. The 'LMI12' designation indicates the 2.5V full-scale voltage, mid-scale power-on reset, and 12-bit resolution. Other variants include the H-grade for automotive/high-temperature use and different reset configurations.

Replacement Considerations

Direct replacements within the same family include other LTC2634 variants with different resolutions or package types. For pin-compatible alternatives with different interfaces, consider the LTC2635 series, which offers I2C compatibility. Ensure any substitute maintains the required 12-bit resolution, quad channel count, and industrial temperature rating.