LTC2634IUD-HMX12#PBF

Overview

The LTC2634IUD-HMX12#PBF is a quad 12-bit voltage output digital-to-analog converter (DAC) from Analog Devices. It features an integrated precision reference providing a full-scale output of 4.096V and operates on a single 4.5V to 5.5V supply. The device utilizes a 3-wire SPI/MICROWIRE compatible serial 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 4.8µs at ±1/2 LSB, and ultralow DAC-to-DAC crosstalk of 2.4nV·s. It incorporates double-buffered data latches and a power-on reset circuit configured to set outputs to mid-scale in external reference mode upon initialization.

Feature Summary

• Quad 12-bit resolution with rail-to-rail buffered voltage outputs
• Integrated 4.096V precision reference with 10ppm/°C drift
• SPI/MICROWIRE compatible 3-wire serial interface operating up to 50MHz
• Power-on reset to mid-scale in external reference mode
• Ultralow DAC-to-DAC crosstalk of 2.4nV·s

Applications

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

Procurement Notes

Verify the specific ordering suffix HMX against the manufacturer's documentation to confirm the power-on reset behavior and reference mode configuration. Ensure the package type matches the design requirements, as this part uses a 16-lead QFN format. Confirm that the supply voltage range of 4.5V to 5.5V aligns with the system power architecture before procurement.

Selection Notes

Select this component when a quad-channel DAC with high accuracy and low crosstalk is required. The 12-bit resolution and ±2.5 LSB INL make it suitable for precision instrumentation. Choose this variant over internal reference modes if the system requires the DAC full-scale to track an external reference voltage. Ensure the PCB layout accommodates the 3mm × 3mm QFN package with proper thermal grounding for the exposed pad.

Part Context

This part belongs to the LTC2634 family, which includes 8-bit, 10-bit, and 12-bit variants in both QFN and MSOP packages. The 'I' designation indicates an industrial temperature range of –40°C to 85°C. The 'H' suffix denotes the 4.096V full-scale version requiring a minimum 4.5V supply. The '#PBF' suffix confirms lead-free construction compliant with RoHS standards.

Replacement Considerations

Direct replacements within the same family include LTC2634IUD-HMI12#PBF (internal reference reset) or LTC2634IUD-LMX12#PBF (2.5V full-scale). For automotive qualification, consider parts with the #W suffix. Verify pin compatibility and thermal characteristics when substituting between QFN and MSOP packages.