8.3.5 Digital Filter

The device uses a linear-phase finite impulse response (FIR) digital filter that performs both filtering and decimation of the digital data stream coming from the modulator. The digital filter is automatically adjusted for the different data rates and always settles within a single cycle. The frequency responses of the digital filter are illustrated in Figure 48 to Figure 56 for different output data rates. The filter notches and output data rate scale proportionally with the clock frequency. The internal oscillator can vary over temperature as specified in the Electrical Characteristics table. The data rate or conversion time, respectively, and consequently also the filter notches vary proportionally.

Figure 48. Filter Response
(Normal Mode, DR = 20 SPS)

Figure 50. Filter Response
(Normal Mode, DR = 45 SPS)

Figure 49. Detailed View of the Filter Response
(Normal Mode, DR = 20 SPS)

Figure 51. Filter Response
(Normal Mode, DR = 90 SPS)

Figure 52. Filter Response
(Normal Mode, DR = 175 SPS)

Figure 54. Filter Response
(Normal Mode, DR = 600 SPS)

Figure 56. Filter Response
(Turbo Mode, DR = 2 kSPS)

Figure 53. Filter Response
(Normal Mode, DR = 330 SPS)

Figure 55. Filter Response
(Normal Mode, DR = 1 kSPS)