LTC2634CUD-HMX10#PBF

Overview

The LTC2634CUD-HMX10#PBF is a quad 10-bit voltage output DAC in a 16-lead QFN package. It features an integrated precision reference with 10ppm/°C drift, setting the full-scale output to 4.096V. The device operates from a 4.5V to 5.5V supply and includes rail-to-rail output buffers. It communicates via a 50MHz SPI/MICROWIRE compatible interface. Key specifications include ±1 LSB maximum INL, guaranteed monotonicity over -40°C to 125°C, and low power consumption of 0.7mA at 5V. The part is AEC-Q100 qualified for automotive applications.

Feature Summary

• Quad 10-bit DACs with integrated 4.096V reference (10ppm/°C)
• SPI/MICROWIRE compatible 3-wire serial interface up to 50MHz
• Rail-to-rail output buffers with ±1 LSB max INL
• Power-on reset to mid-scale in external reference mode

Applications

• Mobile Communications
• Process Control and Industrial Automation
• Automatic Test Equipment
• Automotive Systems

Procurement Notes

Verify the H suffix indicates the 4.5V–5.5V supply range and 4.096V full-scale output. Confirm the MX suffix specifies power-on reset to mid-scale in external reference mode. Ensure the C grade meets commercial temperature requirements if operating above 70°C, though the datasheet lists H grade for -40°C to 125°C. Check that the UD package corresponds to the 16-lead QFN form factor.

Selection Notes

Select this model when a 4.096V internal reference is required with mid-scale power-up behavior in external reference configurations. The H-grade variant supports wider temperature ranges (-40°C to 125°C) compared to C or I grades. Verify supply voltage compatibility, as the H version requires a minimum of 4.5V. Consider the QFN package size constraints and thermal dissipation requirements for the specific PCB layout.

Part Context

This component belongs to the LTC2634 family of quad DACs, which offers various resolutions (8, 10, 12 bits) and full-scale voltages (2.5V, 4.096V). The H suffix distinguishes it from the L series by its higher supply voltage requirement and larger output swing. The MX suffix differentiates it from MI (internal ref mid-scale) and LZ (zero-scale) variants regarding power-on reset behavior.

Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the source material. Users should consult Analog Devices for specific cross-reference recommendations based on pinout and electrical parameter compatibility.

FAQ

What is the power-on reset state for the LTC2634CUD-HMX10?

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

What is the maximum integral nonlinearity error for this 10-bit DAC?

The maximum INL error is ±1 LSB.

Does this part support daisy-chain operation?

Yes, the QFN package includes an SDO pin that outputs the shifted data for daisy-chaining multiple devices.