SBAS999A June 2019 – January 2021 ADS125H01
PRODUCTION DATA
To reduce the effects of 50-Hz and 60-Hz interference, optimize the filter mode and data rate selection, and the accuracy of the ADC clock to provide the required 50-Hz and 60-Hz rejection. Table 9-5 summarizes the 50-Hz and 60-Hz noise rejection versus filter mode and data rate. The table values are based on a 2% and 6% tolerance of the 50-Hz and 60-Hz input frequencies relative to the ADC clock frequency. Common-mode noise is also rejected at 50 Hz and 60 Hz.
| DIGITAL FILTER AMPLITUDE (dB) | |||||
|---|---|---|---|---|---|
| DATA RATE (SPS) | FILTER TYPE | 50 Hz (±2%) | 50 Hz (±6%) | 60 Hz (±2%) | 60 Hz (±6%) |
| 2.5 | FIR | –113 | –88 | –99 | –80 |
| 2.5 | Sinc1 | –36 | –40 | –37 | –37 |
| 2.5 | Sinc3 | –108 | –120 | –111 | –111 |
| 2.5 | Sinc4 | –144 | –160 | –148 | –148 |
| 5 | FIR | –111 | –77 | –95 | –76 |
| 5 | Sinc1 | –34 | –30 | –34 | –30 |
| 5 | Sinc3 | –102 | –90 | –102 | –90 |
| 5 | Sinc4 | –136 | –120 | –136 | –120 |
| 10 | FIR | –111 | –73 | –94 | –68 |
| 10 | Sinc1 | –34 | –25 | –34 | –25 |
| 10 | Sinc3 | –102 | –75 | –102 | –75 |
| 10 | Sinc4 | –136 | –100 | –136 | –100 |
| 16.6 | Sinc1 | –34 | –24 | –21 | –21 |
| 16.6 | Sinc3 | –102 | –72 | –63 | –63 |
| 16.6 | Sinc4 | –136 | –96 | –84 | –84 |
| 20 | FIR | –95 | –66 | –94 | –66 |
| 20 | Sinc1 | –18 | –18 | –34 | –24 |
| 20 | Sinc3 | –54 | –54 | –102 | –72 |
| 20 | Sinc4 | –72 | –72 | –136 | –96 |
| 50 | Sinc1 | –34 | –24 | –15 | –15 |
| 50 | Sinc3 | –102 | –72 | –45 | –45 |
| 50 | Sinc4 | –136 | –96 | –60 | –60 |
| 60 | Sinc1 | –13 | –12 | –34 | –24 |
| 60 | Sinc3 | –40 | –36 | –102 | –72 |
| 60 | Sinc4 | –53 | –48 | –136 | –96 |