LTC6820IMS#PBF

Specialized Overview

The LTC6820IMS#PBF is an isoSPI isolated communications interface IC manufactured by Analog Devices Inc. It provides bidirectional SPI communication between two isolated devices via a single twisted-pair connection, bridging isolation barriers using standard pulse transformers. The device supports data rates up to 1 Mbps and operates with a VDD supply voltage range of 2.7V to 5.5V and a VDDS I/O supply range of 1.7V to 5.5V. It features ultralow idle current of 2µA (MSTR=0V) or 1µA (MSTR=VDD), automatic wake-up detection, and configurable drive currents and comparator thresholds via external resistors. The component is qualified for automotive applications under AEC-Q100 standards and operates within a temperature range of –40°C to +85°C in a 16-lead MSOP package.

Specialized Feature Summary

• Provides galvanic isolation for SPI interfaces using simple pulse transformers across a single twisted pair
• Features ultralow power consumption with automatic wake-up detection from idle state
• Configurable drive currents and receiver thresholds allow optimization for cable length and noise immunity
• Supports all four standard SPI clock phase and polarity modes

Specialized Applications

• Industrial networking systems requiring isolated microcontroller connections
• Battery monitoring systems with multicell stacks
• Remote sensor networks over long cable distances

Specialized Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct package type and temperature grade. Confirm that the #PBF designation corresponds to the tube packaging format rather than tape and reel variants. Cross-reference the AEC-Q100 qualification status if the application requires automotive-grade reliability specifications.

Specialized Selection Notes

Select this component when high-speed isolated SPI communication is required without complex software drivers. Ensure the system design accommodates the 2.7V to 5.5V VDD range and 1.7V to 5.5V VDDS level-shifting requirements. Verify that the external resistor network for IBIAS and ICMP pins can be implemented to meet the desired signal-to-noise ratio and cable length constraints.

Specialized Part Context

The LTC6820 belongs to the isoSPI family of isolated communication interfaces designed by Analog Devices. It serves as a bridge between standard SPI masters/slaves and isolated bus segments. The IMS variant specifically denotes the industrial temperature grade (-40°C to +85°C) housed in a 16-lead plastic MSOP package, distinct from the higher temperature H-grade or QFN package options available in the series.

Specialized Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.