Datasheet AD8233 (Analog Devices)

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50 µA, 2 mm × 1.7 mm WLCSP, Low Noise, Heart Rate Monitor for Wearable Products Data Sheet AD8233 FEATURES FUNCTIONAL BLOCK DIAGRAM Fully integrated, single-lead ECG front end A4 B4 A3 A2 A1 HPSENSE IAOUT REFIN +V Low quiescent supply current: 50 µA (typical) S GND HPDRIVE Leads on/off detection while in shutdown (<1 µA) A5 FR B3 S1 10kΩ A3 Common-mode rejection ratio: 80 dB (dc to 60 Hz) +IN 2-electrode and 3-electrode configurations B5 AC/DC B2 –IN IA High signal gain (G = 100) with dc blocking capabilities C5 2-pole adjustable high-pass filter SDN 150kΩ B1 Accepts up to ±300 mV of half cell potential AD8233 C4 Fast restore feature improves filter settling RLDFB Uncommitted op amp RLD SDN C2 D5 A2 3-pole adjustable low-pass filter with adjustable gain RLD LOD LEADS OFF Integrated RLD amplifier with shutdown DETECTION C C1 Single-supply operation: 1.7 V to 3.5 V S2 Integrated reference buffer generates virtual ground 10kΩ A1 Rail-to-rail output
001
SW OPAMP+ REFOUT OPAMP– OUT D4 D3 C3 D2 D1 Internal RFI filter
13737-
8 kV HBM ESD rating
Figure 1. 20-Ball WLCSP
Shutdown pin
To improve the common-mode rejection of the line frequencies
2 mm × 1.7 mm WLCSP package
in the system and other undesired interferences, the AD8233
APPLICATIONS
includes a right leg drive (RLD) amplifier for driven electrode applications.
Fitness and activity heart rate monitors
The AD8233 includes a fast restore function that reduces the
Portable ECG
duration of the otherwise long settling tails of the high-pass
Wearable and remote health monitors
filters. After an abrupt signal change that rails the amplifier
Gaming peripherals
(such as a leads off condition), the AD8233 automatically adjusts
Biopotential signal acquisition, such as EMG or EEG
to a higher filter cutoff. This feature al ows the AD8233 to
GENERAL DESCRIPTION
recover quickly, and therefore, to take valid measurements The AD8233 is an integrated signal conditioning block for soon after connecting the electrodes to the subject. electrocardiogram (ECG) and other biopotential measurement The AD8233 is available in a 2 mm × 1.7 mm, 20-ball WLCSP applications. It is designed to extract, amplify, and filter small package and a 150 μm thin die for height constrained applications. biopotential signals in the presence of noisy conditions, such as Performance is specified from 0°C to 70°C and is operational those created by motion or remote electrode placement. This from −40°C to +85°C. design allows an ultralow power analog-to-digital converter The AD8233 has several improvements over the AD8232, (ADC) or an embedded microcontrol er to easily acquire the which are detailed in Table 1. output signal.
Table 1. AD8232 v s. AD8233 Comparison
The AD8233 implements a two-pole, high-pass filter for
Parameter AD8232 AD8233
eliminating motion artifacts and the electrode half cel potential. Supply Current 170 µA 50 µA This filter is tightly coupled with the instrumentation amplifier Peak-to-Peak Voltage Noise 14 µV p-p 8.5 µV architecture to allow both large gain and high-pass filtering in a (f = 0.5 Hz to 40 Hz) single stage, thereby saving space and cost. Leads On or Off Detection Not included Included in Shutdown An uncommitted operational amplifier enables the AD8233 to Right Leg Drive Shutdown Not included Included create a three-pole, low-pass filter to remove additional noise. Package Size 4 mm × 4 mm × 2 mm × 1.7 mm × The user can select the frequency cutoff of al filters to suit 0.75 mm 0.5 mm or 0.15 mm different types of applications.
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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