AD9689-2000EBZ datasheet(60/134 Pages) AD

60 / 134 page

AD9689

Data Sheet

Rev. A | Page 60 of 134

FB2 Filter Description

The FB2 decimate by 5, low-pass, FIR filter uses a 48-tap,

symmetrical, fixed coefficient filter implementation. Table 24

shows the FB2 filter coefficients, and Figure 125 shows the FB2

filter response.

Table 24. FB2 Filter Coefficients

FB2 Coefficient

Number

Normalized

Coefficient

Decimal Coefficient

(21-Bit)

1, 48

0.000007

2, 47

−0.000004

−4

3, 46

−0.000069

−72

4, 45

−0.000244

−256

5, 44

−0.000544

−570

6, 43

−0.000870

−912

7, 42

−0.000962

−1009

8, 41

−0.000448

−470

9, 40

0.000977

1024

10, 39

0.003237

3394

11, 38

0.005614

5887

12, 37

0.006714

7040

13, 36

0.004871

5108

14, 35

−0.001011

−1060

15, 34

−0.010456

−10964

16, 33

−0.020729

−21736

17, 32

−0.026978

−28288

18, 31

−0.023453

−24592

19, 30

−0.005608

−5880

20, 29

0.027681

29026

21, 28

0.072720

76252

22, 27

0.121223

127112

23, 26

0.162346

170232

24, 25

0.185959

194992

–160

–140

–120

–100

–80

–60

–40

–20

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

NORMALIZED FREQUENCY (× Π RAD/s)

Figure 125. FB2 Filter Response

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