XTR104

The XTR104 is a monolithic 4-20mA, two-wire current transmitter integrated circuit designed for bridge input signals. It provides complete bridge excitation, instrumentation amplifier, linearization, and current output circuitry necessary for high impedance strain gage sensors.

The XTR104 instrumentation amplifier can be used over a wide range of gain, accommodating a variety of input signals and sensors. Total adjusted error of the complete current transmitter, including the linearized bridge is less than ±1% over the full 40to +85 temperature range.

This includes zero drift, span drift and non-linearity for bridge outputs as low as 10mV. The XTR104 operates on loop power supply voltages down to 9V.

Linearization circuitry consists of a second, fully independent instrumentation amplifier that controls the bridge excitation voltage. XTR104 provides second-order correction to the transfer function, typically achieving a 20:1 improvement in nonlinearity, even with low cost transducers.

The XTR104 is available in 16-pin plastic DIP and SOL-16 surface-mount packages specified for the 40 to +85 temperature range.