Manufacturer	Analog Devices
Manufacturer Part Number	AD8244BRMZ
Description	IC BUFFER QUAD FET-INPUT 10MSOP
Stock Code	W004537
Download	Technical Datasheet

The AD8244BRMZ is a low power FET input quad Unity-gain Buffer designed to isolate very large source impedances from the rest of the signal chain. The 2pA maximum bias current, near zero current noise and 10 TΩ input impedance introduce almost no error, even with source impedance well into the megaohms. Many traditional operational amplifier pinouts have a supply pin that is next to the non-inverting input. A guard trace must be routed between these pins to avoid leakage currents much larger than the bias current of a FET input op amp. The AD8244 solves this problem with unique pinout that physically separates the high impedance inputs from the low impedance supplies and outputs of the other buffers. The AD8244 design is focused on solving problems specific to buffers. This includes close channel-to-channel matching which allows channels of the AD8244 to be used in differential signal chains with minimal error.

Extremely high input impedance
Low noise
High DC precision – 3μV/°C maximum offset drift (B grade)
No leakage from inputs to supply pins
Provides guarding capability
Rail-to-rail output
Single-supply operation – Input range extends to ground
250μA Maximum supply current per amplifier
2pA Maximum input bias current at 25°C

Technical Details

Operating Temperature	-40.0 °C (min)
Gain Bandwidth Product	2.00 MHz
Input Impedance	10.0 TΩ
Lead-Free Status	Contains Lead
Input Capacitance	3.30 pF
Case/Package	MSOP
Common Mode Rejection Ratio	80.0 dB
Lifecycle Status	Pre-Release
Mounting Style	Surface Mount
Mil-Spec	No
RoHS	Compliant
Slew Rate	800 mV/μs
Packaging	Tube, Rail
Supply Current	2.50 mA
REACH SVHC Compliance	No SVHC
Number of Pins	10
Bandwidth	3.60 MHz