Rad-hard ADC sets the pace for space

Claimed to be the highest performance, single-chip 14-bit, 1Msample per second, successive approximation register (SAR) ADC for radiation-hardened (rad-hard) space applications, the ISL73141SEH has been announced by Renesas.

It is claimed to deliver best in class dynamic and static performance, including signal to noise ratio (SNR), effective number of bits (ENOB), integral non-linearity (INL) and differential non-linearity (DNL). The ADC fully resets after every sample, clearing any errors that result from a single event upset (SEU) due to heavy ion radiation during spaceflight.

The ISL73141SEH contributes to the signal path in long duration geosynchronous / geostationary Earth orbit (GEO) communication satellites and manned spacecraft, including lunar space missions. The 14-bit ADC is claimed to deliver the industry’s best dynamic and static performance to captures real-world analogue transmissions and convert them for processing in the digital domain. The ISL73141SEH ADC is one of seven ICs, including a rad-hard temperature sensor, multiplexer, quad op amp, ADC driver, LDO and voltage reference to form a complete sensor interface signal chain that accelerates telemetry, tracking, and control (TT&C) and flight computer system development, says Renesas.

The space-grade ISL73141SEH is fully characterised for enhanced low dose rate-sensitivity (ELDRS) radiation performance up to 75krad(Si) for total ionising dose (TID) and linear energy transfer (LET) up to 86MeV*cm2/mg for single event effects (SEE). The SEE testing also shows no single event latch-up (SEL) or single event burnout (SEB). In addition, single event transients (SETs) have also been mitigated by testing at an LET range up to 86MeV*cm2/mg.

The ISL73141SEH delivers 1Msample per second throughput with no data latency and no missing codes. The 5V supply, dissipates only 60mW and it operates from a 3.3V supply at 750ksamples per second, dissipating only 28mW.

It operates across the full military temperature range of -55 to +125 degrees C.

The ISL73141SEH SAR ADC is available now in a 14-lead ceramic dual flatpack package. An evaluation board is also available.


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