Datasheet AD8232 (Analog Devices) - 4

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AD8232 Data Sheet Parameter Symbol Test Conditions/Comments Min Typ Max Unit
RIGHT LEG DRIVE AMPLIFIER (A2) 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 100 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 − 0.5 V Hysteresis 60 mV Propagation Delay 0.5 µs AC LEADS OFF DETECTOR Square Wave Frequency FAC 50 100 175 kHz Square Wave Amplitude IAC 200 nA p-p Impedance Threshold Between +IN and −IN 10 20 MΩ Detection Delay 110 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 50 mV Propagation Delay 2 µs Switch Timing Characteristics Feedback Recovery Switch On Time tSW1 110 ms Filter Recovery Switch On Time tSW2 55 ms Fast Restore Reset tRST 2 µs LOGIC INTERFACE Input Characteristics Input Voltage (AC/DC and FR) Low VIL 1.24 V High VIH 1.35 V Input Voltage (SDN) Low VIL 2.1 V High VIH 0.5 V Output Characteristics LOD+ and LOD− terminals Output Voltage Low VOL 0.05 V High VOH 2.95 V SYSTEM SPECIFICATIONS Quiescent Supply Current 170 230 µA TA = 0°C to 70°C 210 µA Shutdown Current 40 500 nA TA = 0°C to 70°C 100 nA Supply Range 2.0 3.5 V Specified Temperature Range 0 70 °C Operational Temperature Range −40 +85 °C 1 Offset referred to the input of the instrumentation amplifier inputs. See the Input Referred Offsets section for additional information. Rev. C | Page 4 of 28 Document Outline Features Applications Functional Block Diagram General Description Revision History Specifications Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Instrumentation Amplifier Performance Curves Operational Amplifier Performance Curves Right Leg Drive (RLD) Amplifier Performance Curves Reference Buffer Performance Curves System Performance Curves Theory of Operation Architecture Overview Instrumentation Amplifier Operational Amplifier Right Leg Drive Amplifier Reference Buffer Fast Restore Circuit Leads Off Detection DC Leads Off Detection AC Leads 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 Analog-to-Digital Converters Driven Electrode Application Circuits Heart Rate Measurement Next to the Heart Exercise Application: Heart Rate Measured at the Hands Cardiac Monitor Configuration Portable Cardiac Monitor with Elimination of Motion Artifacts Packaging and Ordering Information Outline Dimensions Ordering Guide