Datasheet

INA332, INA2332
13
SBOS216B
www.ti.com
APPLICATION CIRCUITS
MEDICAL ECG APPLICATIONS
Figure 9 shows the INA332 configured to serve as a low-cost
ECG amplifier, suitable for moderate accuracy heart-rate
applications such as fitness equipment. The input signals are
obtained from the left and right arms of the patient. The
common-mode voltage is set by two 2MΩ resistors. This
potential through a buffer provides optional right leg drive.
Filtering can be modified to suit application needs by chang-
ing the capacitor value of the output filter.
LOW-POWER, SINGLE-SUPPLY DATA
ACQUISITION SYSTEMS
Refer to Figure 4 to see the INA332 configured to drive an
ADS7818. Functioning at frequencies of up to 500kHz, the
INA332 is ideal for low-power data acquisition.
FIGURE 9. Simplified ECG Circuit for Medical Applications.
OPA336
OPA336
OPA336
Right Arm
Left Arm
1MΩ
REF
1MΩ
1MΩ
10kΩ
10kΩ
2kΩ
2kΩ
1.6nF
0.1µF
100kΩ
100kΩ
+5V
V
R
V
R
V
R
= +2.5V
2MΩ
2MΩ
Right
Leg
INA332
5
3
2
8
7
6
4
1
V+
Shutdown
RG
V
IN
–
V–
V
IN
+
V
OUT PUT