LTC2636HDE-HMX12#PBF

Overview

The LTC2636HDE-HMX12#PBF is an octal 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features an integrated high-accuracy reference with a temperature coefficient of 10ppm/°C, providing a full-scale output of 4.096V. The device operates on a single 4.5V to 5.5V supply and includes a rail-to-rail output buffer guaranteed monotonic over the –40°C to 125°C automotive temperature range. Communication is handled via a 3-wire SPI/MICROWIRE-compatible interface with clock rates up to 50MHz. This specific part number indicates a power-on reset to mid-scale in external reference mode.

Feature Summary

• Octal 12-Bit Resolution: Provides eight independent 12-bit DAC channels with maximum integral nonlinearity (INL) error of ±2.5LSB.
• High-Accuracy Internal Reference: Integrated 10ppm/°C reference sets full-scale output to 4.096V; selectable for external reference operation.
• Automotive Temperature Grade: Guaranteed monotonic operation across the extended –40°C to 125°C temperature range.
• Power-On Reset Configuration: Resets outputs to mid-scale upon power-up when operating in external reference mode.

Applications

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

Procurement Notes

Verify the ordering suffix HMX12 corresponds to the required power-on reset behavior (mid-scale in external reference mode) and resolution (12-bit). Confirm the package type matches the design requirements, as this part utilizes the 14-lead DFN format. Ensure supply voltage sequencing adheres to datasheet limits during power-up to prevent latch-up or damage.

Selection Notes

Select this component if an octal DAC configuration with 12-bit precision and automotive-grade temperature stability is required. The H suffix mandates a 4.5V to 5.5V supply range, distinguishing it from the L-series parts that operate down to 2.7V. Choose the MX suffix specifically when mid-scale initialization in external reference mode is necessary for system safety or calibration routines.

Part Context

This part belongs to the LTC2636 family of octal DACs available in 12-, 10-, and 8-bit resolutions. The DE suffix denotes the 14-lead 4mm × 3mm plastic DFN package. The H grade specifies the automotive temperature range and 4.096V full-scale output capability, while the MX suffix defines the specific power-on reset logic for external reference applications.

Replacement Considerations

Direct replacements within the same family include LTC2636HDE-LMX12#PBF (reset to mid-scale in internal reference mode) or LTC2636HDE-HZ12#PBF (reset to zero-scale). For different resolutions, consider LTC2636HDE-HMX10#PBF or LTC2636HDE-HMX8#PBF. Cross-family alternatives like the LTC2637 offer I2C interfaces but require pinout and software adaptation.