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ADS1292R: How to configure ADS1292R for 2 ch ECG with RLD ?

PYTsai
Genius 11635 points
Part Number: ADS1292R

Hi 

We try to configure ADS1292R for 2 ch ECG with RLD . However we encountered an issue that once added dc-offset +-300mV the gain will be reduced. 

Before adding the dc-offset, the output is 5mV. Using the same setting, once the dc-offset is added, the output will reduced to 1mV.

Below is our setting, would you help review  any modification is needed ? 

ADS1x9x_Reg_Write(ADS1x9x_REG_CONFIG1, 0x00);

ADS1x9x_Reg_Write(ADS1x9x_REG_CONFIG2, 0xA0);

  ADS1x9x_Reg_Write(ADS1x9x_REG_LOFF, 0x10);

ADS1x9x_Reg_Write(ADS1x9x_REG_CH1SET, 0x00);

ADS1x9x_Reg_Write(ADS1x9x_REG_CH2SET, 0x00);

ADS1x9x_Reg_Write(ADS1x9x_REG_RLD_SENS, 0x2C);

  ADS1x9x_Reg_Write(ADS1x9x_REG_LOFF_SENS,0x0F);

 ADS1x9x_Reg_Write(ADS1x9x_REG_LOFF_STAT, 0x08);

ADS1x9x_Reg_Write(ADS1x9x_REG_RESP1,0x02);

ADS1x9x_Reg_Write(ADS1x9x_REG_RESP2,0x03);

  • 0
    TI__Genius 11550 points

    Hi Tsai,

    Thanks for the post. 

    How do you get the output voltage of the ADC after adding the +/-300mV dc-offset to the input? Can you share how the test is set up for clarification? Please measure the differential input voltage at the input channel (AIN = INxP - INxN) to confirm the correct voltage is applied.

    Thanks

    -TC