ADC3908CSSS datasheet(37/131 Pages) TI1

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Table 6-2. Decimation Filter Summary and Maximum Available Output Bandwidth

REAL DECIMATION

DECIMATION

SETTING (N)

OUTPUT RATE

OUTPUT

BANDWIDTH

OUTPUT RATE

(FS = 125 MSPS)

OUTPUT BANDWIDTH

(FS = 125 MSPS)

Real

FS / 2

0.8 × FS / (2 × 2)

62.5 MSPS

25 MHz

FS / 4

0.8 × FS / (4 × 2)

31.25 MSPS

12.5 MHz

FS / 8

0.8 × FS / (8 × 2)

15.625 MSPS

6.25 MHz

FS / 16

0.8 × FS / (16 × 2)

7.8125 MSPS

3.125 MHz

The decimation filter responses are normalized to the ADC sampling clock frequency FS and illustrated in Figure

6-12 to Figure 6-19. They are interpreted as follows:

Each figure contains the filter pass-band, transition band(s) and alias or stop-band(s) as shown in Figure 6-11.

The x-axis shows the offset frequency normalized to the ADC sampling rate FS.

For example, in the divide-by-4 setup, the output data rate is FS / 4 with a Nyquist zone of FS / 8 or 0.125 × FS.

The transition band (colored in blue) is centered around 0.125 × FS and the alias transition band is centered at

0.375 × FS. The stop-bands (colored in red), which alias on top of the pass-band, are centered at 0.25 × FS and

0.5 × FS.

Figure 6-11. Interpretation of the Decimation Filter Plots

Figure 6-12. Decimation by 2 frequency response

Figure 6-13. Decimation by 2 passband ripple

response

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ADC3910D125

SBASAD1 – DECEMBER 2023

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