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Would the INA333 circuit shown in datasheet work well enough for EMG applications?

Dinesh Patil
Intellectual 285 points
Other Parts Discussed in Thread: TINA-TI, INA333, INA326, TL064

I am using INA 333 for EMG signal acquisition using the circuitry shown on page14 in the datasheet with little modification in the placement of the reference (drive) electrode. Also since our electrodes do not have shielding we have removed the shield connection. I am a bit doubtful on whether this combination would work. I also encountered wrong outputs on TINA-TI simulations.

I would be grateful if anyone could give there opinion about the circuit and any way i can improve it.

http://www.ti.com/lit/ds/symlink/ina333.pdf

Thank You,

Dinesh Patil.

  • 0
    TI__Mastermind 25815 points

    Hello Dinesh,

    Please take a look at the following forum threads. The second one may be of particular interest. It utilizes the INA326 as mentioned in the first thread.

    http://e2e.ti.com/support/amplifiers/precision_amplifiers/f/14/p/282827/987286.aspx#987286

    http://e2e.ti.com/support/amplifiers/precision_amplifiers/f/14/t/110568.aspx

  • 0
    Intellectual 285 points

    The INA333 circuit did work however the body offset was too high and hiding all the EMG signal strength. Hence we built an IA using TL064 with bias compensation. Also you can use the reference pin on INA333 for offset cancellation...but found it more tedious.