Part Number:ADS1248
Hi,
In my project I have two ADS1248, one adc gives me linear output but other not. I used system monitor control feature to check problem on AVDD, DVDD, REF.
There seems to be difference in offset calibration reading that is (AVDD + AVSS) / 2.
For ADC which works fine I got readings like :
0000000081
0000000034
0000000118
0000000012
0000000050
0000000155
0000000127
0000000181
0000000052
0000000025
0000000061
0000000108
0000000103
0000000030
0000000087
For ADC which fails to give linear output readings are like :
0000065641
0000000000
0000065577
0000065589
0000065595
0000065557
0000065577
0000065641
0000065623
0000065585
0000065559
0000065577
0000000028
0000000018
0000065619
0000065547
0000000002
AVDD : 2.5V
AVSS: -2.5V
DVDD: 3.3V
REF : Internal 2.048V
If there is problem in mid supply (i.e (AVDD + AVSS) / 2) so whether it is AVDD or AVSS or GND?
what does this variation in count signifies?