AD549LH

The AD549LH is one member of the AD549 series.The AD549 is available in a TO-99 hermetic package. The case is connected to Pin 8 so that the metal case can be independently connected to a point at the same potential as the input terminals, minimizing stray leakage to the case.

Features of the AD549 are:(1)low power: 700 A max supply current;(2)input bias current guaranteed over common-mode voltage range;(3)low input voltage noise: 4 V p-p 0.1 Hz to 10 Hz;(4)MIL-STD-883B parts available.The AD549 is a monolithic electrometer operational amplifier with very low input bias current. Input offset voltage and input offset voltage drift are laser trimmed for precision performance.The AD549's ultralow input current is achieved with "Topgate"JFET technology, a process development exclusive to analog devices.The AD549 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 absolute maximum ratings of the AD549 can be summarized as:(1)supply voltage:±18 V;(2)internal power dissipation:500 mW;(3)output short circuit duration:indefinite;(4)storage temperature range (H): 65°C to +125°C.Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device.  This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied.  Exposure to absolute maximum rating conditions for extended periods may affect device reliability.For supply voltages less than ±18 V, the absolute maximum input voltage is equal to the supply voltage.Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.