GENERAL DESCRIPTION
●The AD8244 is a precision, low power, FET input, quad unity-gain buffer that is designed to isolate very large source impedances from the rest of the signal chain. The 2 pA maximum bias current, near zero current noise, and 10 TΩ input impedance introduce almost no error, even with source impedance well into the megaohms.
●FEATURES
●Low power
● 250 µA maximum supply current per amplifier
●FET input
● 2 pA maximum input bias current at 25°C
● Extremely high input impedance
●Low noise
● 13 nV/√Hz voltage noise at 1 kHz
● 0.4 µV p-p voltage noise (0.1 Hz to 10 Hz)
● 0.8 fA/√Hz current noise at 1 kHz
●High dc precision
● 3 µV/°C maximum offset drift (B grade)
●3 MHz bandwidth
●Unique pinout
● No leakage from inputs to supply pins
● Provides guarding capability
●Rail-to-rail output
●Single-supply operation
● Input range extends to ground
●Wide supply range
● Single-supply: 3 V to 36 V
● Dual-supply: ±1.5 V to ±18 V
●Available in a compact 10-lead MSOP
●APPLICATIONS
●Biopotential electrodes
●Medical instrumentation
●High impedance sensor conditioning
●Filters
●Photodiode amplifiers
