ASD131e04 SPI Speed Vs sampling rate

hello and thank you !
If I may, i have an other issue, i'm using the ads131e4 to measure voltage from a calibrator with this configuration : 2,4 v reference ,1Khz sampling rate , 5/0V AVDD/AVSS , 3,3V DVDD,IN1P => calibrator output pin, IN1N => calibrator COM pin, and i get this result :
faultN = 1
for 1V Input ,data = 1677382
for 2V Input ,data = 2860514
i can't send you a picture of the hole schematic

may be a BIAS voltage is needed??

Best reagrads

Hello these are the registers of the the ads

Name : ADS131e_Registers[0]
Decimal:208
Hex:0xd0
Binary:11010000

Name : ADS131e_Registers[1]
Decimal:150
Hex:0x96
Binary:10010110

Name : ADS131e_Registers[2]
Decimal:224
Hex:0xe0
Binary:11100000

Name : ADS131e_Registers[3]
Decimal:197
Hex:0xc5
Binary:11000101

Name : ADS131e_Registers[4]
Decimal:0
Hex:0x0
Binary:0

Name : ADS131e_Registers[5]
Decimal:16
Hex:0x10
Binary:10000

Name : ADS131e_Registers[6]
Decimal:145
Hex:0x91
Binary:10010001

Name : ADS131e_Registers[7]
Decimal:145
Hex:0x91
Binary:10010001

Name : ADS131e_Registers[8]
Decimal:145
Hex:0x91
Binary:10010001

Name : ADS131e_Registers[9]
Decimal:0
Hex:0x0
Binary:0

Name : ADS131e_Registers[10]
Decimal:0
Hex:0x0
Binary:0

Name : ADS131e_Registers[11]
Decimal:0
Hex:0x0
Binary:0

Name : ADS131e_Registers[12]
Decimal:0
Hex:0x0
Binary:0

Name : ADS131e_Registers[13]
Decimal:0
Hex:0x0
Binary:0

Name : ADS131e_Registers[14]
Decimal:0
Hex:0x0
Binary:0

Name : ADS131e_Registers[15]
Decimal:0
Hex:0x0
Binary:0

Name : ADS131e_Registers[16]
Decimal:0
Hex:0x0
Binary:0

Name : ADS131e_Registers[17]
Decimal:0
Hex:0x0
Binary:0

Name : ADS131e_Registers[18]
Decimal:0
Hex:0x0
Binary:0

Name : ADS131e_Registers[19]
Decimal:1
Hex:0x1
Binary:1

i'm not much of electritian so i suppuse common mode is ((V+) + (V- )/2) witch is 0,5 V??

Hello Brian

no we don't use bias we inject the signal directly to the ADS ,i will try to understand the bias/common-mode stuff and test it/

For now here are some samples  for the test signals :

803uV / - 2399806 uV if my calculations are exact 

2805
2804
2811
2811
2810
2809
2668
16776547
16773190
16773050
16773050
16773043

registers config : 

Name : ADS131e_Registers[0]
Hex:0xd0
Binary:11010000

Name : ADS131e_Registers[1]
Hex:0x96
Binary:10010110

Name : ADS131e_Registers[2]
Hex:0xf0
Binary:11110000

Name : ADS131e_Registers[3]
Hex:0xc5
Binary:11000101

Name : ADS131e_Registers[4]
Hex:0x0
Binary:0

Name : ADS131e_Registers[5]
Hex:0x15
Binary:10101

Name : ADS131e_Registers[6]
Hex:0x91
Binary:10010001

Name : ADS131e_Registers[7]
Hex:0x91
Binary:10010001

Name : ADS131e_Registers[8]
Hex:0x91
Binary:10010001

other thing with internal ref 4 or 2,4 , I get the same results for example for 1 volt input I get 1669726 from ADS and i can reach 5 v as input and no full scale is detected if i use 5 v as reference in my calculations I get mostly good results (PS : we have 5v connected to the VREFP pin)

Hello Brian

yes we have 5v VREF connected, so basically we can't use internal VREF now?

hello Brian !
thank you for the clarification
here is an other issue, we programmed the ADS to work with 1khz sampling rate ,in our code ,we do nothing on the data ready interrupt routine and we got these results (this is the data ready pin)

I can't send you the whole schematics ,you need something in particular?

Hello Brian

I sent the schematics. There is this information, if I read data out from the ADS i get the 1khz with the oscilloscope ,but if not ,I will get a different frequency and strange behavior.

The microcontroller detects only 2khz speed, which i should figure out why. Any way I need just a clarification for the behavior with no data reading from the ADS ,I need it to debug my code.

first pic when reading data.

second we don't read data from ADS.

thank you

Hello Brian,

I'm using 2 oscilloscopes with the same results and I can detect DRDY with the mcu and register the timing. I will continue with what have for now i will contact you if I get any new results .

Thank you :)