The ISL71590SEH is a temperature-to-current transducer
possessing two terminals. It has a high impedance current output
that allows it to be insensitive to voltage drops across long lines.
When provided a differential voltage between 4V and 33V, the
device acts as a constant current regulator that generates a
current equal to 1µA/Kelvin (K).
The ISL71590SEH is specified across the -55°C to +125°C
temperature range and with ±1.7°C accuracy without the
need of additional circuitry, and also capable of operating up
to +150°C. With power requirements as low as 1.5mW (5V at
+25°C), it is an ideal choice for remote sensing applications as
any well-insulated twisted pair cable will allow for proper
operation. It can be used in several additional applications
including temperature compensation networks, flow rate
analysis, anemometry and biasing proportional to absolute
temperature.
The high output impedance (>10MΩ) leaves plenty of room for
variations in the power supply voltage. It is electrically durable
as it can withstand a forward operating voltage of 33V over the
full temperature range both under and without ion beam
radiation and a reverse voltage of -40V.

Features
• 50krad(Si) low dose rate (ELDRS) shift . . . . . . . . . . . . . < 1°C
• Linear output current . . . . . . . . . . . . . . . . . . . . . . . . . . . 1µA/K
• Wide power supply input range (V+ to V-) . . . . . . . 4V to 33V
• Low power consumption . . . . . . . . . . . . . . . . . . 1.5mW at 5V
• High output impedance provides excellent rejection to
variations in the supply line
• Additional linearization circuitry is not needed for operation
• Operating temperature range. . . . . . . . . . . .-55°C to +150°C
• QML qualified per MIL-PRF-38535 requirements
• Radiation environment
- SEL/SEB LETTH . . . . . . . . . . . . . . . . . . . 86.4 MeV•cm2/mg
- Total dose, high dose rate. . . . . . . . . . . . . . . . . 300krad(Si)
- Total dose, low dose rate . . . . . . . . . . . . . . . . . 50krad(Si)

Applications
• RF power amplifier bias compensation
• LCD bias compensation
• Laser diode bias compensation
• Sensor bias and linearization
• Data acquisition systems