24 bit ADC converter with PGA working from 0V?

Discussion in 'General Electronics Chat' started by aamirali, Jul 15, 2014.

  1. aamirali

    Thread Starter Member

    Feb 2, 2012
    I had used ADS1248, it had PGA which can wirk with AVSS+0.1V. So I cannot measure sinle ended signal reference to ground.

    I found another IC, ADS1220, it works if we bypass PGA. But it has 4 channel unlike ADS1248 which has 8 channles?

    Any one IC with 8 channels & can do sinle ended measurement of small signals of range 50mV
  2. ifixit

    Distinguished Member

    Nov 20, 2008
    If you set AVSS to -0.25 Volts to bias it below ground then the input should work at 0 to +50 mV input levels. In this case AVDD should not exceed +5.0 Volts. What is your AVDD now?