link to page 5 AD8233Data SheetParameterSymbol Test Conditions/CommentsMinTypMaxUnit Gain Bandwidth Product GBP 15 kHz Slew Rate SR 0.01 V/µs Voltage Noise Density (RTI) en f = 1 kHz 120 nV/√Hz Peak-to-Peak Voltage Noise (RTI) en p-p f = 0.1 Hz to 10 Hz 7 µV p-p f = 0.5 Hz to 40 Hz 9 µV p-p RIGHT LEG DRIVE AMPLIFIER (A2) Quiescent Supply Current 7.5 10 µA Output Swing RL = 50 kΩ 0.1 +VS − 0.1 V Short-Circuit Current IOUT 11 mA Integrator Input Resistor 120 150 180 kΩ Gain Bandwidth Product GDP 20 kHz REFERENCE BUFFER (A3) Offset Error VOS RL > 50 kΩ 1 mV Input Bias Current IB 100 pA Short-Circuit Current Limit IOUT 12 mA Voltage Range RL = 50 kΩ 0.1 +VS − 0.7 V DC LEADS OFF COMPARATORS Threshold Voltage +VS − 0.27 V Hysteresis 125 mV Propagation Delay 1.5 µs AC LEADS OFF DETECTOR Square Wave Frequency fAC 50 100 175 kHz Square Wave Amplitude IAC 200 nA p-p Input Currents in Shutdown Mode2 IDC +IN, SDN = low 250 nA −IN, SDN = low −300 nA Impedance Threshold Between +IN and −IN, SDN = high 10 20 MΩ Detection Delay 100 μs FAST RESTORE CIRCUIT Switches S1 and S2 On Resistance RON 8 10 12 kΩ Off Leakage 100 pA Window Comparator Threshold Voltage From either rail 100 mV Propagation Delay 2 µs Switch Timing Characteristics Feedback Recovery Switch On Time tS1 +VS = 3 V 160 ms +VS = 1.8 V 80 Filter Recovery Switch On Time tS2 +VS = 3 V 80 ms +VS = 1.8 V 40 Fast Restore Reset tRST +VS = 3 V 3 µs +VS = 1.8 V 1.5 Rev. D | Page 4 of 32 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS INSTRUMENTATION AMPLIFIER PERFORMANCE CHARACTERISTICS OPERATIONAL AMPLIFIER PERFORMANCE CHARACTERISTICS RLD AMPLIFIER PERFORMANCE CHARACTERISTICS REFERENCE BUFFER PERFORMANCE CHARACTERISTICS SYSTEM PERFORMANCE CHARACTERISTICS THEORY OF OPERATION ARCHITECTURE OVERVIEW INSTRUMENTATION AMPLIFIER OPERATIONAL AMPLIFIER RLD AMPLIFIER REFERENCE BUFFER FAST RESTORE CIRCUIT LEADS ON OR OFF DETECTION DC Leads On or Off Detection AC Leads On or Off Detection STANDBY OPERATION INPUT PROTECTION RADIO FREQUENCY INTERFERENCE POWER SUPPLY REGULATION AND BYPASSING INPUT REFERRED OFFSETS LAYOUT RECOMMENDATIONS APPLICATION INFORMATION ELIMINATING ELECTRODE OFFSETS HIGH-PASS FILTERING Two-Pole High-Pass Filter Additional High-Pass Filtering Options LOW-PASS FILTERING AND GAIN Driving ADCs DRIVEN ELECTRODE MEASURING SURFACE ELECTROMYOGRAPHY (EMG) OR ELECTROENCEPHALOGRAPHY (EEG) APPLICATION CIRCUITS Heart Rate Measurement (HRM) Next to the Heart Exercise Application, HRM at the Hands Holter Monitor Configuration Portable Heart Rate and Activity Monitor System Synchronous ECG and Photoplethysmography (PPG) Measurement Using Transimpedance Amplifier (TIA) ADC Mode Using the ADPD1080 USING AD5940, AD8232, AND AD8233 FOR BIOIMPEDANCE AND ELECTROCARDIOGRAM (ECG) MEASUREMENTS DIE INFORMATION OUTLINE DIMENSIONS ORDERING GUIDE
