Hi
I wanted to know how to convert the hex data acquired from ads1298 ECG FE to volts?
What is the exact formula of conversion for both leads and test data.
Hi ismail,
What is your reference voltage and PGA setting on the ADS1298? This will influence the 'codes to volts' conversion. Please take a look at the equations on page 26 of the data sheet and see if that helps you see what it is you need to do for your specific implementation. If you would like to post the details on your PGA settings and reference voltage, we can try to help you with a specific equation.
Regards,
Tom
My reference voltage is 2.4V.and PGA gain is 6.
Hello Tom and Ismail,
The code to voltage input relationship may be
code * LSB size / gain ?
Best regardes.
YJ
Hi Tom.
As you said above, if i got a "800000h" from ADS1298, i changed this to voltage is -2.4V/6=-0.4V?
Is that right? I used internal test signals DC . And my gain was setting to 6.
Another question is about the internal test signals. The internal test signals amplitude is 1V or 2V,and the frequency is 1HZ or 2HZ. But when i chose the DC test signal ,the amplitude also is decided by the TEST_AMP bit(1V or 2V)?
Last question, if i set my ADS1298 in 1KSPS, and i just use one channel which set to the internal test signals ,just DC, what code will i get from the ADS1298 output pin?
Waiting for your reply.
Appreciate.