LTC2634IUD-HMI8#PBF

Overview

The LTC2634IUD-HMI8#PBF is a quad 8-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 a power-on reset to mid-scale in internal reference mode. Communication is handled via a 3-wire SPI/MICROWIRE compatible interface supporting clock rates up to 50MHz. It is housed in a 16-lead 3mm × 3mm QFN package.

Feature Summary

• Quad 8-bit DACs with integrated 2.5V full-scale 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 internal reference mode

Applications

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

Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and standard tube packaging for the QFN variant. Confirm the 'I' grade corresponds to the industrial temperature range (-40°C to 85°C). Ensure the 'UD' package designation matches the required 16-lead QFN footprint. Check for any automotive-specific variants if AEC-Q100 qualification is required for the target application.

Selection Notes

Select this part for applications requiring four independent 8-bit outputs with low power consumption and high accuracy. The internal 2.5V reference simplifies design by eliminating external components. Choose this model over the H-grade if operation below 4.5V is necessary, as the H-grade requires a minimum of 4.5V. Consider the Z or MX reset options if zero-scale or external-reference mid-scale initialization is preferred.

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 variant specifically denotes the Industrial temperature grade and 16-lead QFN package. Other family members include the LTC2635, which uses an I2C interface instead of SPI.

Replacement Considerations

LTC2634CUD-HMI8#PBF: Same electrical performance but commercial temperature range (0°C to 70°C). LTC2634HUD-HMI8#PBF: Automotive grade with extended temperature range (-40°C to 125°C). LTC2634IMSE-HMI8#PBF: Identical electrical specs but in a 10-lead MSOP package.