LTC2636CDE-HMX8#PBF

Overview

The LTC2636CDE-HMX8#PBF is an octal 8-bit voltage-output digital-to-analog converter (DAC) from Analog Devices. It features eight independent channels with rail-to-rail output buffers and a guaranteed monotonic performance across the operating temperature range. The device integrates a high-accuracy reference providing a 4.096V full-scale output, requiring a supply voltage between 4.5V and 5.5V. Communication is handled via a 3-wire SPI/MICROWIRE-compatible serial interface supporting clock rates up to 50MHz. Upon power-up, the outputs reset to mid-scale in external reference mode. The component is housed in a 14-lead 4mm × 3mm plastic DFN package.

Feature Summary

• Octal 8-Bit Architecture: Eight independent DAC channels with rail-to-rail output buffers and guaranteed monotonicity over the specified temperature range.
• Integrated Reference: Internal reference provides a fixed 4.096V full-scale output; supports external reference input for programmable full-scale voltage.
• High-Speed Interface: Compatible with standard SPI and MICROWIRE protocols, operating at serial clock frequencies up to 50MHz.
• Power-On Reset Control: Configurable reset behavior; this specific suffix resets outputs to mid-scale when using an external reference upon power-up.

Applications

• Process control and industrial automation systems
• Portable battery-powered equipment
• Automotive electronic control units
• Optical networking infrastructure
• Automatic test equipment

Procurement Notes

Verify the complete part number including the #PBF lead-free designation and DE package code to ensure correct configuration. Confirm that the system power supply remains within the 4.5V to 5.5V range required for the H-grade internal reference operation. Ensure the PCB layout accommodates the 14-lead DFN footprint with proper grounding of the exposed pad.

Selection Notes

Select this variant specifically for applications requiring an 8-bit resolution with a 4.096V internal full-scale range. Choose the H suffix for the higher voltage headroom compared to the L-series 2.5V devices. The MX suffix indicates mid-scale reset behavior in external reference mode; select MI or Z suffixes if different power-on states are required. Verify compatibility with the 4.5V minimum supply requirement.

Part Context

This component belongs to the LTC2636 family of octal DACs, which also includes 10-bit and 12-bit variants. The family shares identical pinouts and interface protocols but differs in resolution, linearity specifications, and internal reference voltage options. The C temperature grade denotes commercial operation (0°C to 70°C), while I and H grades offer extended industrial and automotive ranges respectively.

Replacement Considerations

Direct replacements within the same family include LTC2636CDE-HMI8#PBF (internal ref reset) or LTC2636CDE-HZ8#PBF (zero-scale reset). For different resolutions, consider LTC2636CDE-HMX10#PBF or LTC2636CDE-HMX12#PBF. Cross-family replacements require verification of pin compatibility and software register mapping.