LTC2636CDE-LMX12#PBF

Overview

The LTC2636CDE-LMX12#PBF is an octal 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features an integrated precision reference with a temperature coefficient of 10ppm/°C, providing a full-scale output of 2.5V when operating in internal reference mode. The device operates on a single supply voltage ranging from 2.7V to 5.5V and communicates via a 3-wire SPI/MICROWIRE-compatible serial interface supporting clock rates up to 50MHz. It includes 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

• Octal architecture with eight independent 12-bit DAC channels in a 14-lead DFN package
• Integrated low-drift reference with 10ppm/°C temperature coefficient for 2.5V full-scale output
• SPI/MICROWIRE compatible 3-wire serial interface with 50MHz maximum clock rate
• Power-on reset to mid-scale in external reference mode

Applications

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

Procurement Notes

Verify the specific ordering suffix #PBF indicates lead-free design compliance. Confirm the DE package designation corresponds to the 14-lead DFN form factor. Ensure the LMX12 code matches the required 12-bit resolution and mid-scale external reference power-on reset behavior. Check availability status as distribution may vary by region.

Selection Notes

Select this part for applications requiring multiple high-resolution voltage outputs with tight thermal stability. The LMX suffix specifies mid-scale reset in external reference mode; choose LZ for zero-scale or MI for internal reference mid-scale reset if system requirements differ. Verify that the 2.7V to 5.5V supply range aligns with the target power rails and that the 14-lead DFN package fits the PCB layout constraints.

Part Context

This component belongs to the LTC2636 family of octal DACs, which offers various combinations of resolution (8-, 10-, or 12-bit), package type (DFN or MSOP), and power-on reset configurations. The C grade denotes commercial temperature operation from 0°C to 70°C. Other variants include industrial (I) and automotive (H) temperature grades, as well as different full-scale voltages like 4.096V for H-grade parts.

Replacement Considerations

Direct substitutes within the same family include LTC2636CDE-LMI12#PBF for internal reference mid-scale reset or LTC2636CDE-LZ12#PBF for zero-scale reset. For lower resolutions, LTC2636CDE-LMX10#PBF or LTC2636CDE-LMX8#PBF are available. Cross-family replacements like the LTC2637 offer I2C interfaces instead of SPI.