Hi,
I want to measure a signal between 0V - 2V5 with the ADS1260.
For this I use the internal reference (REF(06h) = 10h).
The PGA is set in bypass mode (PGA(10h) = 80h).
The multiplexer is set to AIN0 and AINCOM (INPMUX(11h) = 10h).
AVDD = 5V
DVDD = 3V3
AVSS = DVSS = AINCOM = GND
AIN0 = Signal between 0V - 2V5
Why is my value at 2V5 on AIN0 only at 7FFFFFh and not at FFFFFFh?
Why can I measure negative voltages on AIN0 up to -2V5 in bypass mode?
According to datasheet 9.3.1.1 or figure 48 I should never apply a negative voltage below AVSS - 0V3 to an input, but in chapter 9.3.2 or table 4 it is stated that in PGA mode with gain 1 the input voltage may be +/- 2V5. Do I understand the data sheet wrong or is there an error in the data sheet?
With kind regards