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ADS1299: ADS1299 Noise Peaks when use More than one channel

mubeen khalid
Prodigy 155 points
Part Number: ADS1299

I get these spike peaks when i configure more than one channel. 

I have applied 10HZ sinusoidal signal from signal generator. 

When i configure more than one channel these spikes come in the signal and sampling frequency also disturbs. Moreover, I am using arduino microcontroller and using arduino ads1299 library for getting data. When these spike come all the channel values which are off show some random values for miliseconds and again go back to zero as i am not using them.

One more question from my side is that when i common the microcontroller and ads1299 grounds for SPI communication ADS1299 dont start and give strange random values. When i Common the grounds using a resistance of 1000 ohm in series between ground ADS1299 starts properly. We have a 0.6Volts drop at resistance.

  • 0
    TI__Guru**** 180781 points
    Hi Mubeen,

    There is absolutely no reason for you to need a 1000 ohm resistor between the ground of the ADS1299 and your controller. If it only works with the resistor in place, then you are not properly powering things up. If you only get bad data when you enable a second channel, it's most likely because you are not reading all the conversion results between DRDY pulses, which could also impact the sampling rate.