Low Power, Rail-to-Rail Output, Precision JFET Quad Amplifier

The AD8641 / AD8642 / AD8643 are low power, precision JFET input amplifiers featuring extremely low input bias current and rail-to-rail output. The ability to swing nearly rail-to-rail at the input and rail-to-rail at the output enables designers to buffer complementary metal-oxide semiconductor digital-to-analog converters (CMOS DACs), ASICs, and other wide output swing devices in single-supply systems. The outputs remain stable with capacitive loads of more than 500 pF.

The AD8641 / AD8642 / AD8643 are suitable for applications utilizing multichannel boards that require low power to manage heat. Other applications include photodiodes, ATE reference level drivers, battery management, and industrial controls.

The AD8641 / AD8642 / AD8643 are fully specified over the extended industrial temperature range of −40°C to +125°C. The AD8641 is available in 5-lead SC70 and 8-lead SOIC lead-free packages. The AD8642 is available in 8-lead MSOP and 8-lead SOIC lead-free packages. The AD8643 is available in 14-lead SOIC and 16-lead, 3 mm × 3 mm, LFCSP lead-free packages.

Applications

* Line-/battery-powered instruments

* Photodiode amplifiers

* Precision current sensing

* Medical instrumentation

* Industrial controls

* Precision filters

* Portable audio

* ATE

* Low supply current: 250 μA max

* Very low input bias current: 1 pA max

* Low offset voltage: 750 μV max

* Single-supply operation: 5 V to 26 V