Datasheet AD8233 (Analog Devices) - 4

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AD8233 Data Sheet Parameter Symbol Test Conditions/Comments Min Typ Max Unit
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 LOGIC INTERFACE Input Characteristics Input Voltage (AC/DC, FR, and RLD SDN) Low VIL 0.41 × +VS V High VIH 0.45 × +VS V Input Voltage (SDN) Low VIL 0.6 × +VS V High VIH 0.3 × +VS V Output Characteristics LOD terminal Output Voltage RL = 100 kΩ Low VOL 0.05 V High VOH +VS − 0.05 V Rev. 0 | Page 4 of 29 Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS INSTRUMENTATION AMPLIFIER PERFORMANCE CHARACTERISTICS OPERATIONAL AMPLIFIER PERFORMANCE CHARACTERISTICS RIGHT LEG DRIVE (RLD) AMPLIFIER PERFORMANCE CHARACTERISTICS REFERENCE BUFFER PERFORMANCE CHARACTERISTICS SYSTEM PERFORMANCE CHARACTERISTICS THEORY OF OPERATION ARCHITECTURE OVERVIEW INSTRUMENTATION AMPLIFIER OPERATIONAL AMPLIFIER RIGHT LEG DRIVE AMPLIFIER REFERENCE BUFFER FAST RESTORE CIRCUIT LEADS ON/OFF DETECTION DC Leads On/Off Detection AC Leads On/Off Detection STANDBY OPERATION INPUT PROTECTION RADIO FREQUENCY INTERFERENCE (RFI) POWER SUPPLY REGULATION AND BYPASSING INPUT REFERRED OFFSETS LAYOUT RECOMMENDATIONS APPLICATIONS 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 APPLICATION CIRCUITS HEART RATE MEASUREMENT (HRM) NEXT TO THE HEART EXERCISE APPLICATION—HEART RATE MEASURED AT THE HANDS HOLTER MONITOR CONFIGURATION SYNCHRONIZED ECG AND PPG MEASUREMENT PACKAGING AND ORDERING INFORMATION OUTLINE DIMENSIONS ORDERING GUIDE