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AD8233ACBZ-R7 数据表(PDF) 28 Page - Analog Devices

部件名 AD8233ACBZ-R7
功能描述  Fitness and activity heart rate monitors
PDF  30 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD8233ACBZ-R7 数据表(HTML) 28 Page - Analog Devices

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Data Sheet
AD8233
Rev. 0 | Page 27 of 29
The overall narrow-band nature of the two-pole, low-pass filter
filter combination distorts the ECG waveform significantly.
Therefore, it is only suitable to determine the heart rate, and not
to analyze the ECG signal characteristics.
The low-pass filter stage also includes a gain of 11, bringing the
total system gain close to 1100. Because the ECG signal is
measured at the hands, it is weaker than when measured closer
to the heart.
The RLD circuit drives to the third electrode, which can also be
located at the hands, to cancel common-mode interference.
HOLTER MONITOR CONFIGURATION
The circuit in Figure 75 is designed for monitoring the shape of
the ECG waveform.
To obtain an ECG waveform with minimal distortion, the
AD8233 is configured with a 0.5 Hz, single-pole, high-pass
filter, followed by a two-pole, 40 Hz, low-pass filter. A third
electrode is driven for optimum common-mode rejection.
70
0
0.01
1k
FREQUENCY (Hz)
10
20
30
40
50
60
0.1
1
10
100
Figure 74. Frequency Response of Holter Monitor Circuit
In addition to 40 Hz filtering, the op amp stage is configured for
a gain of 2, resulting in a total system gain of 200. Keeping the
gain lower helps with any motion artifacts picked up in band.
To optimize the dynamic range of the system, the gain level is
adjustable, depending on the input signal amplitude (which
may vary with electrode placement) and ADC input range.
RA
LA
RL
+VS
HPSENSE
IAOUT
+VS
REFIN
GND
FR
AC/DC
SDN
LOD
+IN
–IN
HPDRIVE
RLD
RLDFB
OUT
OPAMP+
OPAMP–
REFOUT
SW
AD8233
5.6nF
499kΩ
1MΩ
1MΩ
5.6nF
150kΩ
150kΩ
1MΩ
10MΩ
10MΩ
0.1µF
10MΩ
0.1µF
300kΩ
3.3µF
+VS
(= +2.5V)
ELECTRODE
INTERFACE
...TO 11-13 ENOB ADC
RLD SDN
10MΩ
+VS
1nF
10MΩ
+VS
10MΩ
...TO MCU
...TO MCU
0.5Hz TO 40Hz
GAIN = ×200
Figure 75. Holter Monitor Circuit



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