INA322EASLASH2K5 datasheet(13/18 Pages) TI2

13 / 18 page

INA322

SBOS174B

FIGURE 9. Simplified ECG Circuit for Medical Applications.

APPLICATION CIRCUITS

Medical ECG Applications

Figure 9 shows the INA322 configured to serve as a low-

cost ECG amplifier, suitable for moderate accuracy heart-

rate applications such as fitness equipment. The input sig-

nals are obtained from the left and right arms of the patient.

The common-mode voltage is set by two 2M

Ω resistors.

This potential through a buffer, provides optional right leg

drive. Filtering can be modified to suit application needs by

changing the capacitor value of the output filter.

Low-Power, Single-Supply Data Acquisition

Systems

Refer to Figure 5 to see the INA322 configured to drive an

ADS7818. Functioning at frequencies of up to 500kHz, the

INA322 is ideal for low-power data acquisition.

OPA336

Right Arm

Left Arm

Ω

REF

Ω

10k

Ω

10k

Ω

1.6nF

0.1

µF

100k

Ω

100k

Ω

+5V

R = +2.5V

Ω

Right

Leg

INA322

V+

Shutdown

IN–

V–

IN+

OUT PUT

INA322EA/2K5 Datenblatt(PDF) 13 Page - Texas Instruments

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