Datasheet

R
1
100 kW
1/2
OPA2333
RA
Inverted
V
CM
+V
S
INA321
(1)
+VS
V
OUT
+V
S
+V
S
+V
S
OPA333
+V
S
1/2 V
S
dc
3
2
1
4
5
6
G = 1 kV/V
TOT
G = 5
INA
G = 200
OPA
f = 150 Hz
LPF
f = 0.5 Hz
HPF
(provides ac signal coupling)
V = +2.7 V to +5.5 V
S
BW = 0.5 Hz to 150 Hz
f = 0.5 Hz
O
Wilson
V
CENTRAL
(RA + LA + LL) / 3
7
ac
1/2 V
S
R
2
100 kW
1/2
OPA2333
LL
+V
S
R
3
100 kW
1/2
OPA2333
LA
R
4
100 kW
R
9
20 kW
R
6
100 kW
RL
+V
S
+V
S
1/2
OPA2333
1/2
OPA2333
1/2
OPA2333
C
4
1.06 nF
C
3
1 Fm
R
14
1 MW
R
12
5 kW
R
13
318 kW
R
7
100 kW
R
8
100 kW
R
10
1 MW
C
2
0.64 Fm
R
11
1 MW
C
1
47 pF
R
5
390 kW
OPA333
OPA2333
SBOS351D –MARCH 2006–REVISED NOVEMBER 2013 www.ti.com
(1) Other instrumentation amplifiers can be used, such as the INA326, which has lower noise, but higher quiescent
current.
Figure 26. Single-Supply, Very Low Power, ECG Circuit
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