单电源，低功耗，高精度FET输入器Quad Buffer Single-Supply, Low Power, Precision FET Input Quad Buffer
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