INA330
INA3
30 SBOS260 – NOVEMBER 2002 THERMISTOR SIGNAL AMPLIFIER
FOR TEMPERATURE CONTROL
FEATURES DESCRIPTION ● OPTIMIZED FOR PRECISION 10kΩ
THERMISTOR APPLICATIONS
в—Џ LOW OFFSET OVER TEMPERATURE:
0.009°C Temperature Error, –40°C to +85°C The INA330 is a precision amplifier designed for thermoelectric cooler (TEC) control in optical networking applications. It
is optimized for use in 10kΩ thermistor-based temperature
controllers. The INA330 provides thermistor excitation and
generates an output voltage proportional to the difference in
resistances applied to the inputs. It uses only one precision
resistor plus the thermistor, thus providing an alternative to
the traditional bridge circuit. This new topology eliminates the
need for two precision resistors while maintaining excellent
accuracy for temperature control applications. в—Џ EXCELLENT LONG-TERM STABILITY в—Џ VERY LOW 1/f NOISE: (0.01Hz to 10Hz)
(Peak-to-Peak Equivalent to 0.0001В°C) в—Џ WIDE OUTPUT SWING: Within 10mV of Rails An excitation voltage is applied to the thermistor (RTHERM)
and precision resistor (RSET), creating currents I1 and I2. The
current conveyor circuit produces an output current, IO, equal
to I1 – I2, which flows through the external gain-setting
resistor. A buffered voltage output proportional to IO is also
provided. в—Џ SUPPLY RANGE: Single +2.7V to +5.5V
в—Џ microPACKAGE: MSOP-10 …
