Hi,
1. The ADS1261 ADC have data rate rang was 2.5 to 40KSPS, whether it is possible to perform filter calculation for the maximum limit of 40 ksps..?, if it is possible to calculate, then what should be the maximum limit for Cut off frequency of differential & common-mode to consider for the filter design?
2. I did the filter calculation for this adc with the data rate of 40ksps. Whether the below calculation can be considered for the thermocouple design?
here I consider 1 SPS = 1 Hz is it correct?
| ADS1261 - sugession | ||||||||
| Ref Tesk | Value | Unit | Common mode cut off frequency | Differential mode cut off frequency | ||||
| C165 = CM1 | 0.000000004700 | F | Formula | fIN_CM = 1 / (2 • π • CIN_CM • RIN) | Formula | fIN_DIFF = 1 / (2 • π • CIN_DIFF • 2 • RIN) | ||
| C167 = CM2 | 0.000000004700 | F | ||||||
| R149 = RIN1 | 1130 | Ω | ||||||
| R150 = RIN2 | 1130 | Ω | FIN_CM1 | 29982.23852 | Hz | |||
| C166 = CDIF | 0.000000047 | F | FIN_CM2 | 29982.23852 | Hz | FIN_DIFF | 1499.111926 | Hz |
The above snip has been taken from this link for your reference: K-type thermocouple measurement circuit with precision ADC
