LTC2634IUD-LZ12#PBF

Overview

The LTC2634IUD-LZ12#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 low noise of 0.75mVP-P. Communication is handled via a 3-wire SPI/MICROWIRE compatible interface with clock rates up to 50MHz. Power-on reset defaults to zero-scale in internal reference mode.

Feature Summary

• Quad 12-bit resolution with maximum INL error of ±2.5 LSB
• Integrated 10ppm/°C precision reference providing 2.5V full-scale output
• Rail-to-rail output buffers with ultralow crosstalk (2.4nV•s)
• SPI/MICROWIRE compatible 3-wire serial interface operating at 50MHz

Applications

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

Procurement Notes

Verify that the component matches the specified industrial temperature grade (–40°C to 85°C) and the 16-lead QFN package configuration. Confirm the power-on reset behavior aligns with the zero-scale requirement for internal reference mode applications. Ensure compatibility with the 2.7V to 5.5V supply voltage range during system design validation.

Selection Notes

Select this part when four independent 12-bit DAC channels are required with high accuracy and low noise. The 'I' suffix indicates suitability for industrial environments, while 'LZ12' specifies the 2.5V internal reference, zero-scale power-on reset, and 12-bit resolution. Consider the external reference option if a different full-scale voltage is needed.

Part Context

This component belongs to the LTC2634 family, which offers quad DACs in 12-, 10-, and 8-bit resolutions. Variants include the LTC2634-L for 2.7V operation and LTC2634-H for 4.5V operation. The IUD package denotes the 16-lead QFN form factor used in space-constrained designs.

Replacement Considerations

The LTC2635 series provides similar functionality but utilizes an I2C interface instead of SPI. For direct pin-compatible replacement within the same family, verify specific suffixes for matching resolution, reference voltage, and reset behavior.