R

1

100kW

1/2

OPA2378

RA

Inverted

V

CM

+V

S

INA321

(1)

V

OUT

+V

S

+V

S

+V

S

OPA378

+V

S

1/2V

S

dc

3

2

1

4

5

6

G

=1kV/V

TOT

G

=5

INA

G

=200

OPA

f

=150Hz

LPF

f

=0.5Hz

HPF

(providesacsignalcoupling)

V =+2.7Vto+5.5V

S

BW=0.5Hzto150Hz

f =0.5Hz

O

Wilson

V

CENTRAL

(RA+LA+LL)/3

7

ac

1/2V

S

R

2

100kW

1/2

OPA2378

LL

+V

S

R

3

100kW

1/2

OPA2378

LA

R

4

100kW

R

9

20kW

R

6

100kW

RL

+V

S

+V

S

1/2

OPA2378

1/2

OPA2378

1/2

OPA2378

C

4

1.06nF

C

3

1 F

m

R

14

1MW

R

12

5kW

R

13

318kW

R

7

100kW

R

8

100kW

R

10

1MW

C

2

0.64 F

m

R

11

1MW

C

1

47pF

R

5

390kW

OPA378

OPA2378

SBOS417D – JANUARY 2008 – REVISED OCTOBER 2009

www.ti.com

(1) Other instrumentation amplifiers can be used, such as the INA326, which has lower noise but higher quiescent current.

Figure 37. Single-Supply, Very Low Power ECG Circuit

16

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