Aerospace & Defence

Increasing ESD protection and signal processing performance

7th March 2016
Joe Bush

The portfolio of radiation tolerant multiplexers from Intersil Corporation has been expanded with the release of two new, single supply 5V devices. The 16-channel ISL71830SEH and 32-channel ISL71831SEH multiplexers join Intersil’s 30V multiplexers, which have been onboard many satellite and space exploration missions, including NASA’s Orion spacecraft flight test.

The 5V multiplexers address the growing trend toward reduced system voltage rails. They provide data acquisition systems with electrostatic discharge (ESD) protection, and deliver lower RON and input leakage for reduced power consumption and higher signal integrity. The 5V multiplexers also offer faster propagation delays, which improves signal processing response time.

The performance of the ISL71830SEH and ISL71831SEH is achieved by leveraging Intersil’s proprietary silicon on insulator process, which provides single event latch-up (SEL) robustness in heavy ion environments. The devices’ enhanced 5kV ESD protection feature eliminates the need for costly external protection diodes on the input pins. In addition, both multiplexers have reduced RON of 120 Ohms and propagation delays of less than 100ns to increase the overall performance and accuracy of telemetry signals processed and multiplexed into an analogue-to-digital converter’s (ADC) input.

The ISL71830SEH and ISL71831SEH offer over voltage protection on a per-switch basis to maintain the continuous processing of hundreds of telemetry test points. If any input channel experiences an over voltage condition, the remaining channels continue sending data to the ADC. Both multiplexers provide a ‘cold spare’ redundant capability, allowing the connection of two to three additional unpowered multiplexers to a common data bus. This mission critical feature is required for long duration space flights. The system automatically activates the back-up multiplexer should a failure occur.

“The ISL71830SEH and ISL71831SEH support our customers’ lower 3.3V and 5V system voltage rails while offering more than twice the performance of competing solutions,” said Philip Chesley, Senior Vice President of Precision Products at Intersil. “The new 16 channel and 32 channel devices meet the mission assurance needs of manned spacecraft and next generation satellites.”

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