Rad-hard voltage regulator range gains output options for 12-bit ADC supplies

July 15, 2014 // By Graham Prophet
Intersil has introduced additional voltage options for its radiation hardened family of ultra low noise, high precision voltage references. The ISL71091SEH voltage references ensure signal processing integrity and improve voltage accuracy in satellite applications.

Four devices, the ISL71091SEH10, 20, 33 and 40 provide voltages previously unavailable for the rad hard space market; the family enables better overall accuracy for 11-bit and 12-bit ADC resolution applications. The device family offers lowest output voltage noise and a reference voltage that is stable over time, temperature and ionising radiation, providing increased precision in satellite data acquisition, signal processing and power management applications.

Customers designing for rigorous applications require reliable precision analogue solutions to obtain better overall accuracy. The ISL71091SEH20 provides a 2.048V voltage reference specifically for commonly used 11-bit ADC resolution, and the ISL71091SEH40 provides a 4.096V voltage reference specifically for 12-bit ADC resolution. Both devices provide a reference voltage consistent with 1 mV LSB. These voltage reference options enable the system designer to optimise accuracy within 11 and 12-bit signal processing system resolution targets, respectfully, ensuring signal processing integrity.

The radiation hardened voltage references use Intersil's SOI-based PR40 process providing Single Event Latch-up (SEL) immunity to ensure robust performance in heavy ion environments. This and other Intersil technologies reduce performance compromises in even the most challenging applications. This advanced bipolar technology enables the ISL71091SEH family to achieve very low output noise with an initial voltage accuracy of 0.05%. The ISL71091SEH devices provide leading voltage accuracy as well, ±0.15% over temperature (-55C to +125C) and ±0.25% ionising radiation.

The ISL71091SEH devices, available in the smallest surface mount leaded package available also reduce overall solution size. Sinking capability on chip eliminates the need for buffering, which reduces system complexity while also increasing overall system accuracy.

Features include;

• ISL71091SEHVF40: 4.096V with an input voltage range from 6 to 30V, typical 6.2 µVp-p 0.1 Hz to 10 Hz and 6.6 µVrms 10 Hz to 1 kHz output noise with an initial voltage accuracy of 0.05%

• ISL71091SEHVF33: 3.3V with an input voltage range from 4.6 to 30V, typical 5 µVp-p (3.3 Vout) 0.1 Hz to 10 Hz noise with