SBAS502C December 2011 – April 2020 ADS1291 , ADS1292 , ADS1292R
PRODUCTION DATA.
The differential (INP – INN) signal range depends on the analog supply and reference used in the system. Equation 6 shows this range.
The 3-V supply, with a reference of 2.42 V and a gain of 6 for ECGs, is optimized for power with a differential input signal of approximately 300 mV. For higher dynamic range, a 5-V supply with a reference of 4.033 V (set by the VREF_4V bit of the CONFIG2 register) can be used to increase the differential dynamic range.