ZHCSJC0 January 2019 ADS1260-Q1 , ADS1261-Q1
ADVANCE INFORMATION for pre-production products; subject to change without notice.
To reduce 50-Hz and 60-Hz noise interference, configure the conversion period to reject the noise at 50 Hz and 60 Hz. 50-Hz and 60-Hz noise rejection depends on the filter type. Table 7 summarizes the 50-Hz and 60-Hz noise rejection versus data rate and filter type. The table values are based on 2% and 6% tolerance of noise frequency to ADC clock frequency. For the sinc filter mode, noise rejection is increased by increasing the order of the filter. Common mode noise is also rejected at these frequencies.
| DATA RATE (SPS) | FILTER TYPE | DIGITAL FILTER RESPONSE (dB) | |||
|---|---|---|---|---|---|
| 50 Hz ±2% | 60 Hz ±2% | 50 Hz ±6% | 60 Hz ±6% | ||
| 2.5 | FIR | –113 | –99 | –88 | –80 |
| 2.5 | Sinc1 | –36 | –37 | –40 | –37 |
| 2.5 | Sinc2 | –72 | –74 | –80 | –74 |
| 2.5 | Sinc3 | –108 | –111 | –120 | –111 |
| 2.5 | Sinc4 | –144 | –148 | –160 | –148 |
| 5 | FIR | –111 | –95 | –77 | –76 |
| 5 | Sinc1 | –34 | –34 | –30 | –30 |
| 5 | Sinc2 | –68 | –68 | –60 | –60 |
| 5 | Sinc3 | –102 | –102 | –90 | –90 |
| 5 | Sinc4 | –136 | –136 | –120 | –120 |
| 10 | FIR | –111 | –94 | –73 | –68 |
| 10 | Sinc1 | –34 | –34 | –25 | –25 |
| 10 | Sinc2 | –68 | –68 | –50 | –50 |
| 10 | Sinc3 | –102 | –102 | –75 | –75 |
| 10 | Sinc4 | –136 | –136 | –100 | –100 |
| 16.6 | Sinc1 | –34 | –21 | –24 | –21 |
| 16.6 | Sinc2 | –68 | –42 | –48 | –42 |
| 16.6 | Sinc3 | –102 | –63 | –72 | –63 |
| 16.6 | Sinc4 | –136 | –84 | –96 | –84 |
| 20 | FIR | –95 | –94 | –66 | –66 |
| 20 | Sinc1 | –18 | –34 | –18 | –24 |
| 20 | Sinc2 | –36 | –68 | –36 | –48 |
| 20 | Sinc3 | –54 | –102 | –54 | –72 |
| 20 | Sinc4 | –72 | –136 | –72 | –96 |
| 50 | Sinc1 | –34 | –15 | –24 | –15 |
| 50 | Sinc2 | –68 | –30 | –48 | –30 |
| 50 | Sinc3 | –102 | –45 | –72 | –45 |
| 50 | Sinc4 | –136 | –60 | –96 | –60 |
| 60 | Sinc1 | –13 | –34 | –12 | –24 |
| 60 | Sinc2 | –27 | –68 | –24 | –48 |
| 60 | Sinc3 | –40 | –102 | –36 | –72 |
| 60 | Sinc4 | –53 | –136 | –48 | –96 |