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AD8233 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD8233
Beschreibung Heart Rate Monitor
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 30 Seiten
AD8233 Datasheet, Funktion
Data Sheet
50 μA, 2 mm × 1.7 mm WLCSP, Low Noise,
Heart Rate Monitor for Wearable Products
AD8233
FEATURES
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
Internal RFI filter
8 kV human body model (HBM) ESD rating
Shutdown pin
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
GENERAL DESCRIPTION
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 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.
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.
To improve the common-mode rejection of the line frequencies
in the system and other undesired interferences, the AD8233
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
FUNCTIONAL BLOCK DIAGRAM
A4 B4
HPSENSE IAOUT
HPDRIVE
A5
S1 10k
+IN
B5
–IN
C5
IA
A3
REFIN
A2
+VS
A3
A1
GND
FR B3
AC/DC B2
150k
C4
RLDFB
D5 A2
RLD
10k
AD8233
S2
SDN B1
RLD SDN C2
LEADS OFF
DETECTION
LOD
C C1
A1
SW OPAMP+ REFOUT OPAMP–
D4 D3 C3 D2
OUT
D1
Figure 1.
includes an amplifier for driven lead applications, RLD.
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 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.
Table 1. AD8232 vs. AD8233 Comparison
Parameter
AD8232
AD8233
Supply Current
170 μA
50 μA
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
Included
Right Leg Drive Shutdown
Not included
Included
Package Size
4 mm × 4 mm ×
0.75 mm
2 mm × 1.7 mm ×
0.5 mm
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com






AD8233 Datasheet, Funktion
Data Sheet
Parameter
SYSTEM SPECIFICATIONS
Quiescent Supply Current
Wakeup Current
Shutdown Current
Peak-to-Peak Voltage Noise (RTI)
Supply Range
Specified Temperature Range
Operational Temperature Range
Symbol Test Conditions/Comments
TA = 0°C to 70°C
SDN = low, LOD = low
TA = 0°C to 70°C
SDN = low, LOD = high
TA = 0°C to 70°C
VDIFF = 0 V
f = 0.5 Hz to 40 Hz
f = 0.05 Hz to 150 Hz
VDIFF = ±0.3 V
f = 0.5 Hz to 40 Hz
f = 0.05 Hz to 150 Hz
1 Offset referred to the input of the instrumentation amplifier inputs.
2 In ac leads off and shutdown mode, the dc leads off comparator at the +IN pin trips the LOD pin.
Min Typ
50
60
0.65
0.75
0.5
0.6
9
15
11
21
1.7
0
−40
AD8233
Max Unit
70 μA
μA
1.5 μA
μA
1 μA
μA
μV p-p
μV p-p
μV p-p
μV p-p
3.5 V
70 °C
+85 °C
Rev. 0 | Page 5 of 29

6 Page









AD8233 pdf, datenblatt
Data Sheet
OPERATIONAL AMPLIFIER PERFORMANCE CHARACTERISTICS
AD8233
1000
800
600
400
200
0
–4
–2 0
2
OFFSET VOLTAGE (mV)
Figure 21. Offset Distribution
4
120
GAIN
0
100 PHASE MARGIN –20
80 –40
60
40
20
0
–20
–40
–60
0.1
1
10 100
1k
FREQUENCY (Hz)
–60
–80
–100
–120
–140
–160
–180
10k 100k
Figure 22. Open-Loop Gain and Phase Margin vs. Frequency
22pF
470pF
1nF
0.5V/DIV
400µs/DIV
Figure 24. Large Signal Transient Response
10k
1k
100
10
0.1
1
10 100
1k
FREQUENCY (Hz)
10k 100k
Figure 25. Voltage Noise Spectral Density vs. Frequency
5µV/DIV
100µs/DIV
20mV/DIV
Figure 23. Small Signal Response for Various Capacitive Loads
1s/DIV
Figure 26. 0.1 Hz to 10 Hz Noise
Rev. 0 | Page 11 of 29

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