Rad-hard precision current sources to feed satellites' resistive sensors

October 15, 2018 //By Julien Happich
Rad-hard precision current sources to feed satellites' resistive sensors
Renesas Electronics' ISL70591SEH and ISL70592SEH radiation-hardened precision current sources are designed to provide current excitation to the more than 300 resistive sensors that monitor the health of a satellite’s subsystems. The new devices are Renesas' first current source ICs in its line of space products, and are well suited for telemetry, tracking & command, attitude & orbital control, and electrical power subsystem applications.

The ISL70591SEH and ISL70592SEH come in 4-lead ceramic flatpack packages and provide 100µA and 1mA of output current, respectively. They offer a smaller footprint than competitive devices, and replace the discrete solutions that typically require three to five components. The smaller package size boosts reliability by placing the excitation source closer to the sensor. The Renesas current source ICs also reduce system errors by delivering ultra-low noise for higher accuracy (±0.34% for the ISL70591SEH, ±0.30% for the ISL70592SEH) over temperature and radiation. Their high output impedance rejects voltage variations on the supply line, and lets designers parallel multiple current sources if they need higher current.

Renesas’ proprietary silicon on insulator process provides single event latch-up (SEL) and single event burn-out (SEB) robustness in heavy ion environments. Both devices are radiation assurance tested to 100krad(Si) at high dose rate and 75krad(Si) at low dose rate. In addition, Renesas’ floating design lets users create a current source or sink with no ground connection. The devices operate from a wide 3V to 40V range off unregulated 28V power rails.

Renesas Electronics -  www.renesas.com

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