INA330

Supply Voltage .................................................................................. +5.5V
Signal Input Terminals:
(Pins 1, 2, 3, 6, and 10) Voltage(2) ........................... 0.5V to (V+) + 0.5V
                                      Current(2) ................................................. ±10mA
Output Short-Circuit(3) .............................................................. Continuous
Operating Temperature Range .......................................... 40 to +125
Storage Temperature Range .............................................. 65 to +150
Junction Temperature ........................................................................ +150
Lead Temperature (soldering, 10s) ................................................... +300

NOTES: (1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those specified is not implied. (2) Input terminals are diode clamped to the power-supply rails. Input signals that can swing more than 0.5V beyond the supply rails should be current limited to 10mA or less. (3) Short-circuit to ground.

The INA330 is a precision amplifier designed for thermoelectric cooler (TEC) control in optical networking applications. It is optimized for use in 10k 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.

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.

The INA330 offers excellent long-term stability, and very low 1/f noise throughout the life of the product. The low offset results in a 0.009 temperature error from 40 to +85. It comes in MSOP-10 packaging and operates with supply voltages from +2.7V to +5.5V. It is specified over the industrial temperature range, 40 to +85, with operation from 40 to +125.