LTC2634IUD-LMX12#TRPBF

Overview

The LTC2634IUD-LMX12#TRPBF is a quad 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices, housed in a 16-lead 3mm × 3mm QFN package. It features an integrated precision reference providing 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 interface with clock rates up to 50MHz. Key electrical specifications include a maximum integral nonlinearity (INL) error of ±2.5 LSB, a settling time of 4.2µs at 3V, and ultralow DAC-to-DAC crosstalk of 2.4nV•s. It incorporates double-buffered data latches and a power-on reset circuit configured to initialize outputs to mid-scale.

Feature Summary

• Quad 12-bit resolution with rail-to-rail buffered outputs
• Integrated 10ppm/°C precision reference for 2.5V full-scale output
• Power-on reset to mid-scale in external reference mode
• Ultralow crosstalk between DAC channels (2.4nV•s typical)

Applications

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

Procurement Notes

Verify the specific suffix #TRPBF indicates tape and reel packaging containing 2,500 pieces. Confirm the I-grade designation corresponds to the industrial temperature range of –40°C to 85°C. Ensure the LMX12 configuration matches the required mid-scale power-on reset behavior for external reference applications.

Selection Notes

Select this part when four independent 12-bit channels are required in a compact QFN footprint. The LMX12 variant is appropriate for designs requiring mid-scale initialization during power-up while using an external reference source. Verify that the system supply voltage remains within the 2.7V to 5.5V range specified for the LTC2634-L family.

Part Context

This component belongs to the LTC2634 family, which includes 8-, 10-, and 12-bit variants in both QFN and MSOP packages. The 'I' grade denotes industrial temperature performance, distinguishing it from commercial (C) and automotive (H) grades. The 'UD' package code specifies the 16-lead QFN form factor, while 'LMX12' defines the 12-bit resolution, 2.5V internal reference capability, and mid-scale external reset logic.

Replacement Considerations

Direct pin-compatible replacements within the same family include LTC2634IUD-LMI12#TRPBF (mid-scale internal reset) or LTC2634IUD-LZ12#TRPBF (zero-scale reset). For different resolutions, consider LTC2634IUD-LMX10#TRPBF or LTC2634IUD-LMX8#TRPBF. Automotive qualified versions are available with the #W suffix.