First rad tolerant 36V instrumentation amplifier with integrated differential ADC driver
Featuring an integrated differential analogue-to-digital converter (ADC) driver, Intersil’s radiation tolerant 36V instrumentation amplifier (in-amp) is said by the company to deliver the industry’s highest signal processing performance for low-level sensor telemetry data critical to communication satellites. Its high integration and best-in-class performance can reduce system size, weight and power (SWAP) costs, and accelerate time to market.
The ISL70617SEH enables high common-mode rejection ratio (CMRR) and power supply rejection ratio (PSRR) at all gain settings. Designers can program the in-amp’s gain from 0.1 to 10,000 using two external resistors. The device is wafer-by-wafer guaranteed to 75krad (Si) with a low dose rate exposure of 10mrad/sec, which the company says more closely resembles the space environment than the high dose rate testing used with competitive devices.
The ISL70617SEH provides single event latch-up (SEL) and single event burnout (SEB) robustness of 60MeV in heavy ion environments. And its single event transient (SET) performance of <10usec eliminates the need for extra filtering.
The ISL70517SEH joins the ISL70617SEH, and offers similar features but implements a differential input and rail-to-rail single-ended output. Both in-amps allow designers to power the input/output stages from different supplies using individual power supply pins. Designers are able to take the input signals riding on a high common-mode voltage and level shift them to a low voltage device. For example, the in-amps can protect downstream ICs from high voltage signals by tying the amplifier’s rail-to-rail output to an ADC’s low voltage power supply. This also preserves the ADC maximum input dynamic range and eliminates ADC input overdrive.
The ISL70617SEH and ISL70517SEH can be combined with the ISL71830SEH 16-channel and ISL71831SEH 32-channel 5V multiplexers, ISL71590SEH temperature sensor, ISL71090SEH25 voltage reference, ISL75052SEH 1.5A LDO regulator, ISL75051SEH 3A LDO regulator, and op amps such as the ISL70444SEH, ISL70244SEH, ISL70417SEH, ISL70218SEH, ISL70227SEH, ISL70419SEH to support a telemetry signal chain with superior radiation tolerant performance.