AD9874ABST datasheet(27/40 Pages) AD

27 / 40 page

REV. A

AD9874

–27–

Figures 16a and 16b show expanded views of the pass band for the

two possible configurations of the third decimation filter. When

decimating by 60n (K = 0), the pass-band gain variation is 1.2 dB;

when decimating by 48n (K = 1), the pass-band gain variation is

0.9 dB. Normalization of full scale at band center is accurate to

within 0.14 dB across all decimation modes. Figures 17a and 17b

show the folded frequency response of the decimator for K = 0

and K = 1, respectively.

NORMALIZED FREQUENCY – RELATIVE TO

fOUT

0.250

0.125

–1

–2

–3

PASS-BAND GAIN FREQUENCY = 1.2dB

Figure 16a. Pass-Band Frequency Response of

the Decimator for K = 0

NORMALIZED FREQUENCY – RELATIVE TO

fOUT

0.250

0.125

–1

–2

–3

PASS-BAND GAIN VARIATION = 0.9dB

Figure 16b. Pass-Band Frequency Response of

the Decimator for K = 1

NORMALIZED FREQUENCY – RELATIVE TO

fOUT

0.50

0.25

–20

–40

–60

–80

–100

–120

MIN ALIAS ATTN = 87.7dB

Figure 17a. Folded Decimator Frequency Response for K = 0

NORMALIZED FREQUENCY – RELATIVE TO

fOUT

0.50

0.25

–20

–40

–60

–80

–100

–120

MIN ALIAS ATTN = 97.2dB

Figure 17b. Folded Decimator Frequency Response for K = 1

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