AD549LHZ

The AD549LHZ is an Ultralow Input Bias Current Operational Amplifier with very low input bias current. Input offset voltage and input offset voltage drift are laser trimmed for precision performance. The ultralow input current of the part is achieved with Topgate™ JFET technology. This technology allows fabrication of extremely low input current JFETs compatible with a standard junction isolated bipolar process. The 10¹⁵R common-mode impedance which results from the bootstrapped input stage ensures that the input current is essentially independent of the common mode voltage. It is suited for applications requiring very low input current and low input offset voltage. It excels as a preamp for a wide variety of current output transducers, such as photodiodes, photomultiplier tubes or oxygen sensors. The AD549 can also be used as a precision integrator or low droop sample-and-hold and is pin compatible with standard FET and electrometer operational amplifiers.