50 μA, 2 mm × 1.7 mm WLCSP, Low Noise,
Heart Rate Monitor for Wearable Products
Data Sheet
AD8233
FEATURES
FUNCTIONAL BLOCK DIAGRAM
A4
B4
A3
A2
A1
Fully integrated, single-lead electrocardiogram (ECG) front end
Low quiescent supply current: 50 μA (typical)
Leads on/off detection while in shutdown (<1 μA)
Common-mode rejection ratio: 80 dB (dc to 60 Hz)
2 or 3 electrode configurations
High signal gain (G = 100) with dc blocking capabilities
2-pole adjustable high-pass filter
Accepts up to 300 mV of half cell potential
Fast restore feature improves filter settling
Uncommitted op amp
3-pole adjustable low-pass filter with adjustable gain
Integrated right leg drive (RLD) amplifier with shutdown
Single-supply operation: 1.7 V to 3.5 V
Integrated reference buffer generates virtual ground
Rail-to-rail output
HPSENSE
HPDRIVE
IAOUT
REFIN
+V
GND
S
A5
FR
AC/DC
SDN
B3
B2
B1
S1 10kΩ
A3
+IN
B5
IA
–IN
C5
150kΩ
AD8233
C4
RLDFB
RLD SDN C2
LOD
D5
A2
RLD
LEADS OFF
DETECTION
C1
C
S2
10kΩ
A1
SW
OPAMP+ REFOUT OPAMP–
OUT
D4
D3
C3
D2
D1
Internal RFI filter
8 kV human body model (HBM) ESD rating
Shutdown pin
Figure 1.
2 mm × 1.7 mm WLCSP
APPLICATIONS
Fitness and activity heart rate monitors
Portable ECG
Wearable and remote health monitors
Gaming peripherals
Biopotential signal acquisition, such as EMG
includes an amplifier for driven lead applications, RLD.
GENERAL DESCRIPTION
The AD8233 includes a fast restore function that reduces the
duration of the otherwise long settling tails of the high-pass
filters. After an abrupt signal change that rails the amplifier
(such as a leads off condition), the AD8233 automatically
adjusts to a higher filter cutoff. This feature allows the AD8233
to recover quickly, and therefore, to take valid measurements
soon after connecting the electrodes to the subject.
The AD8233 is an integrated signal conditioning block for ECG
and other biopotential measurement applications. It is designed
to extract, amplify, and filter small biopotential signals in the
presence of noisy conditions, such as those created by motion or
remote electrode placement. This design allows an ultralow
power analog-to-digital converter (ADC) or an embedded
microcontroller to easily acquire the output signal.
The AD8233 is available in a 2 mm × 1.7 mm, 20-ball WLCSP
package. Performance is specified from 0°C to 70°C and is
operational from −40°C to +85°C.
The AD8233 implements a two-pole high-pass filter for
eliminating motion artifacts and the electrode half cell potential.
This filter is tightly coupled with the instrumentation architec-
ture of the amplifier to allow both large gain and high-pass
filtering in a single stage, thereby saving space and cost.
Table 1. AD8232 vs. AD8233 Comparison
Parameter
AD8232
AD8233
50 μA
Supply Current
170 μA
An uncommitted operational amplifier enables the AD8233 to
create a three-pole, low-pass filter to remove additional noise.
The user can select the frequency cutoff of all filters to suit
different types of applications.
Peak-to-Peak Voltage Noise
(f = 0.5 Hz to 40 Hz)
14 μV p-p
8.5 μV
Leads On/Off Detection in
Shutdown
Not included
Not included
Included
Right Leg Drive Shutdown
Package Size
Included
To improve the common-mode rejection of the line frequencies
in the system and other undesired interferences, the AD8233
4 mm × 4 mm ×
0.75 mm
2 mm × 1.7 mm ×
0.5 mm
Rev. 0
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Technical Support
©2016 Analog Devices, Inc. All rights reserved.
www.analog.com
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