LTC2634CUD-LMX12#TRPBF

Overview

The LTC2634CUD-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 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 interface with clock rates up to 50MHz. Key electrical specifications include a maximum integral nonlinearity error of ±2.5 LSB, rail-to-rail output buffers, and a typical settling time of 4.2µs for 12-bit accuracy. It incorporates a power-on reset circuit configured to set outputs to mid-scale in external reference mode.

Feature Summary

• Quad 12-bit resolution with integrated 10ppm/°C precision reference
• Rail-to-rail output buffers with guaranteed monotonicity over -40°C to 125°C
• SPI/MICROWIRE compatible 3-wire serial interface operating at 50MHz
• Power-on reset to mid-scale in external reference mode

Applications

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

Procurement Notes

Verify the specific suffix #TRPBF indicates a tape and reel quantity of 2,500 pieces. Confirm the 'LMX' designation corresponds to the mid-scale power-on reset in external reference mode. Ensure the C temperature grade (0°C to 70°C) meets application requirements, as H-grade variants support extended ranges. Cross-reference the datasheet revision E for any recent parameter updates or pin configuration changes.

Selection Notes

Select this part when four independent 12-bit channels are required in a compact QFN footprint. The L-series internal reference provides a 2.5V full-scale output, suitable for 2.7V to 5.5V single-supply designs. Choose the MX variant if mid-scale initialization is preferred during power-up in external reference configurations. Verify that the 50MHz serial clock speed aligns with the system's microcontroller capabilities.

Part Context

This component belongs to the LTC2634 family, which includes 8-bit, 10-bit, and 12-bit variants. The CUD package denotes the 16-lead QFN form factor. The L suffix specifies the 2.5V full-scale range, while M and X define the reset behavior. Other packages include the 10-lead MSOP (MSE). The family shares identical pinouts and interface protocols across resolutions.

Replacement Considerations

Direct substitutes within the same family include LTC2634CUD-LMI12#TRPBF (internal reference reset) or LTC2634CUD-HZ12#TRPBF (different voltage/reset). For different resolutions, consider LTC2634CUD-LMX10#TRPBF or LTC2634CUD-LMX8#TRPBF. External replacements require matching SPI compatibility, voltage ranges, and package dimensions.