LTC2634IMSE-LMX12#PBF

Overview

The LTC2634IMSE-LMX12#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 temperature range, and low noise characteristics. Communication is handled via a 3-wire SPI/MICROWIRE compatible interface supporting clock rates up to 50MHz. This specific variant resets to mid-scale in external reference mode upon power-up.

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 external reference mode

Applications

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

Procurement Notes

Verify that the package type matches the design requirements, as this part uses a 10-lead MSOP configuration. Confirm the operating temperature grade corresponds to the Industrial specification (-40°C to 85°C). Ensure the power-on reset behavior aligns with system initialization needs, specifically the mid-scale reset in external reference mode.

Selection Notes

Select this component when a quad-channel DAC with high accuracy and low power consumption is required. The 12-bit resolution provides precise control for applications needing fine voltage steps. Consider the 2.5V full-scale limit if using the internal reference; otherwise, an external reference can be utilized. Verify that the 3-wire interface timing meets the system's clock speed requirements.

Part Context

This part belongs to the LTC2634 family, which offers various combinations of resolution (8-, 10-, or 12-bit), full-scale voltage (2.5V or 4.096V), and power-on reset options. The IMSE suffix indicates the Industrial temperature grade and MSOP package. Other variants include QFN packages and different reset configurations such as zero-scale or internal reference mid-scale.

Replacement Considerations

Direct replacements within the same family include other LTC2634 variants with adjusted resolutions or reset behaviors. For I2C interfaces, the LTC2635 series serves as a functional alternative with similar performance characteristics but different communication protocols.