Just to clarify, are you referring to "RLD" as Right-Leg Drive amplifier?
Could you please also give some background on what application are you doing right now with AD8244?
Yes, RLD = Right Leg Driver.
I want to use AD8244 as input buffer and Low-Pass Filter for EEG device. But I'm not sure, can I use AD8244 as RLD?
Applications for AD8244 includes biopotential electrodes, medical instrumentation, high impedance sensor conditioning and filters. The purpose of a right leg circuit is to reduce the effective electrode resistance by several orders of magnitude and allow a safe amount of current to flow. The AD8244 is a high impedance, low power, FET input opamp. Its pinout is configured to have guarding capability from parasitic resistance and capacitance which are a requirement for RLD. Also, another purpose of RLD is to minimize common-mode voltage, configuring AD8244 as RLD can also improve its CMRR.
Please check this thread for additional information on RLD.
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