SBASAM0B March 2024 – November 2024 ADS127L18
PRODMIX
The sinc3 + sinc1 filter mode is the cascade of the sinc3 and a sinc1 filter. The OSR of the sinc3 stage is fixed (OSR = 32000) and the OSR of the sinc1 stage is programmable to 3 and 5. Table 7-7 summarizes the characteristics of the sinc3 + sinc1 filter.
MODE | fCLK (MHz) |
OSR (A × B) (1) |
DATA RATE (SPS) | –3dB
FREQUENCY (Hz) |
LATENCY
(ms) |
NMRR AT FIRST NULL (dB) | |
---|---|---|---|---|---|---|---|
2% CLOCK TOLERANCE | 6% CLOCK TOLERANCE | ||||||
Max speed | 32.768 | 96000 (32000 × 3) |
170 | 69 | 9.77 | 34 | 26 |
High speed | 25.6 | 133.3 | 54 | 12.5 | |||
Mid speed | 12.8 | 66.6 | 27 | 25 | |||
Low speed | 3.2 | 16.7 | 6.7 | 100 | |||
Max speed | 32.768 | 160000 (32000 × 5) |
102 | 43.5 | 13.7 | 34 | 26 |
High speed | 25.6 | 80 | 34 | 17.5 | |||
Mid speed | 12.8 | 40 | 17 | 35 | |||
Low speed | 3.2 | 10 | 4.2 | 140 |
Figure 7-23 shows the frequency response of the sinc3 + sinc1 filter. The frequency response exhibits the characteristic sinc filter response lobes and nulls. The nulls occur at fDATA and at multiples thereof. Figure 7-24 shows the detailed response in the region of 0.9 to 1.1 · fIN / fDATA.