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ADS1293: Isolation

seven

Part Number: ADS1293

Hi,

I saw the isolation solution as below

https://e2e.ti.com/support/isolation/digital_isolators/f/1013/t/468214?tisearch=e2e-quicksearch&keymatch=isolation%20medical.

If I power the system by AC-DCs,  Can I use the solution?

Or can I isolation the ECG system at the PC interface if I power the system by AC-DCs?

I want to design a ECG system with lead 3, lead 4, and lead 5. Can I use ADS1293 to finish it? Do you recomand AFE or other discrete component solution?

I need the anolog ECG signal. Can I get the signal from ADS1293, and change it into anolog signal with DACs?

Best regards,

seven

  • 0
    TI__Guru 69156 points
    Hello Seven,

    Thanks for your post!

    Isolated power is really beyond the scope of our forum. I would consult with the isolation team about getting power across the isolation barrier.

    What's the reason that you want to convert the digital conversion results from the ADS1293 back into analog?

    The ADS1293 can support up to 6 different electrode connections. There are 3 simultaneously-sampling ADC channels, so you can measure up to 3 unique differential channels. Examples of 3-lead and 5-lead applications are shown in Figures 84 and 86, respectively.

    Best Regards,
  • 0 in reply to Ryan Andrews

    Hi Ryan,

    Thanks for the reply.

    I want to design a ECG monitor. According to the information I have, the monitor should give an anolog signal. So what's you opinion?

    As far as you know, how did your client power ADS129X? Did they use an AC-DCs, or did they use USB interface from PC, or did they only use batteries?

    I want to know if I have to use batteries to power ads129x.

    Do you recommend integrating AFE scheme or discrete component scheme if I use AC-DCs to power it?

     

    Best Regards,

    Seven

     

     

  • 0 in reply to seven
    TI__Guru 69156 points

    Hello Seven,

    seven said:
    I want to design a ECG monitor. According to the information I have, the monitor should give an anolog signal. So what's you opinion?

    I'm not sure what your objective is. Do you need to plot the waveform in your application? You could convert the digital output code from the ADC into "Volts" using the voltage weight of one code (i.e. the LSB size) and plot it that way, or I suppose you could use a low-resolution DAC and plot in the analog domain. The choice is yours.

    USB supplies are fairly noisy and not well regulated. I would not recommend using the USB supply directly - it would be more reliable to step-up the USB supply and then bring it back down with an LDO to clean up the power supply noise. Switching supplies are certainly more efficient than LDOs., but the switching ripple can hurt the ADC noise performance. A combination of switching supplies followed by LDOs is probably the most efficient and least noisy solution. Batteries are certainly low-noise as well and often used in portable applications.

    Best Regards,