2-Lead ECG Analog Frontend

Posted by mshieh on September 23, 2010 Leave a comment (19)

The ECG2_AM1 is a fully functional implementation of a 2-lead electrocardiogram (ECG) analog frontend. It consists of input protection, amplification, 60Hz notch filtering, antialiasing, and buffering for direct connection to an analog-to-digital converter (ADC). The module has been designed to offer the user a low noise, low offset, and low power solution in a small package that is compatible with 0.1” pitch breadboards for easy prototyping. A minimum of external components, such as decoupling capacitors and power regulation, are all that are needed for its proper use. For more control, a reference pin is provided so that the user may dynamically adjust the virtual ground of the output signal. If this control is not desired, the system intrinsically generates a reference voltage that positions the output signal at about 1/6 the differential voltage between the positive and negative power supply rails. An internal bias is also provided to the inputs so that a no input signal condition will result in an output with a minimum chance of saturation from stray interference. Single and dual rail power supplies ranging from 2.7v (±1.35v) to +5.5v (±2.75v) can be used with the module.

Click here for data sheet

Click here for schematic

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Comments


  1. Gigi commented
     @ 2012-12-10 03:00:11

    Hi..
    I need it for a Medical Thesis…

    How can I buy it..?!?! and how much it costs…?!?!

    Thank’s a lot for the product..

  2. seeed122757 commented
     @ 2012-04-22 05:42:01

    Next to 60 Hz filtering you might consider 50 Hz filtering (switchable by jumper)

  3. pooferfish commented
     @ 2012-02-18 03:42:53

    I am looking for this board or something like it. I am prototyping now and would pay for some samples if you still have some.

  4. straub.aw commented
     @ 2011-12-29 03:37:46

    I’m looking for a low cost ECG.

  5. robomotic commented
     @ 2011-12-26 05:29:56

    It’s a great idea and there are virtually no available frontends for ECG.

  6. robomotic commented
     @ 2011-11-15 04:46:27

    What about kickstarting it ?
    With a simple reflow station you can solder it by hand, it’s just a couple of components really.
    We can start with a batch order of pcbs.
    :-)

  7. rich commented
     @ 2011-10-08 08:22:33

    How much would Seeed charge to do a batch of 50-100? I am certain we can find a way to sell that number.

  8. sebastian commented
     @ 2011-08-15 09:12:36

    i think you should build it and post on eBay. I’m sure there’s plenty of hobbyist, medical students and medical electronics research scientist would interest it.

  9. rjsc commented
     @ 2011-06-16 04:35:18

    To make universal, can you easily change the 60 Hz notch filter to a 50Hz-60Hz band rejection filter, or dual notch (50Hz and 60 Hz)?
    That would make it usable everywhere in the world, given the fact that most of the world uses a 50 Hz power grid.
    Reference: http://upload.wikimedia.org/wikipedia/commons/f/f5/Weltkarte_der_Netzspannungen_und_Netzfrequenzen.svg

    • robomotic commented
       @ 2011-11-15 04:42:07

      I work with ECG, common practice for USA/EU boards is a simple tunable dsp filter that you need anyway to clean the signal.
      A two pole IIR always does the job. Will be happy to cooperate on this project.

    • xiachunyi commented
       @ 2011-06-16 06:21:30

      Page 9 of the datasheet has the information needed to change the notch filter from 60Hz to 50Hz or any other frequency you wish to use.

  10. matthewburmeister commented
     @ 2011-05-25 09:58:41

    Great, I’ve been wanting a ECG front end for a while now.


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