LTC2634IUD-LMX12#PBF

Overview

The LTC2634IUD-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 industrial temperature range, and communicates via a 50MHz SPI/MICROWIRE compatible 3-wire serial interface. Power-on reset defaults to mid-scale in external reference mode.

Feature Summary

• Quad 12-bit resolution with ±2.5 LSB maximum integral nonlinearity error
• Integrated 10ppm/°C precision reference providing 2.5V full-scale output
• Rail-to-rail buffered outputs with ultralow DAC-to-DAC crosstalk (2.4nV•s)
• Industrial temperature grade (-40°C to 85°C) in a 16-lead 3mm × 3mm QFN package

Applications

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

Procurement Notes

Verify the specific suffix 'LMX' indicates power-on reset to mid-scale in external reference mode. Confirm the 'I' designation corresponds to the industrial temperature range of -40°C to 85°C. Ensure the '#PBF' suffix confirms lead-free compliance for procurement specifications.

Selection Notes

Select this part when four independent 12-bit channels are required with low noise and high accuracy. The LMX variant is suitable for designs requiring a known mid-scale state upon power-up rather than zero-scale. Verify that the 2.5V internal reference range meets the application's output voltage requirements.

Part Context

This component belongs to the LTC2634 family, which offers 12-, 10-, and 8-bit resolutions in both QFN and MSOP packages. The IUD-LMX12 configuration specifically combines the industrial temperature grade, 16-lead QFN packaging, 12-bit resolution, and external reference power-on reset behavior.

Replacement Considerations

LTC2634CUD-LMX12#PBF: Identical electrical performance but rated for commercial temperature range (0°C to 70°C).

FAQ

What is the default output state after power-up?

The LTC2634IUD-LMX12 resets to mid-scale in external reference mode upon power-up.

What is the maximum operating clock rate for the serial interface?

The SPI/MICROWIRE compatible serial interface supports clock rates up to 50MHz.

Is the device guaranteed to be monotonic?

Yes, the LTC2634 is guaranteed monotonic over the entire operating temperature range of -40°C to 85°C.