AD9689-2000EBZ datasheet(59/134 Pages) AD

59 / 134 page

Data Sheet

AD9689

Rev. A | Page 59 of 134

TB1 Filter Description

The TB1 decimate by 3, low-pass, FIR filter uses a 76-tap,

symmetrical, fixed coefficient filter implementation. Table 23

shows the TB1 filter coefficients, and Figure 124 shows the TB1

filter response. TB1 is only supported in DDC0 and DDC1.

Table 23. TB1 Filter Coefficients

TB1 Coefficient

Number

Normalized

Coefficient

Decimal Coefficient

(22-Bit)

1, 96

−0.000023

−96

2, 75

−0.000053

−224

3, 74

−0.000037

−156

4, 73

0.000090

379

5, 72

0.000291

1220

6, 71

0.000366

1534

7, 70

0.000095

398

8, 69

−0.000463

−1940

9, 68

−0.000822

−3448

10, 67

−0.000412

−1729

11, 66

0.000739

3100

12, 65

0.001665

6984

13, 64

0.001132

4748

14, 63

−0.000981

−4114

15, 62

−0.002961

−12418

16, 61

−0.002438

−10226

17, 60

0.001087

4560

18, 59

0.004833

20272

19, 58

0.004614

19352

20, 57

−0.000871

−3652

21, 56

−0.007410

−31080

22, 55

−0.008039

−33718

23, 54

0.000053

222

24, 53

0.010874

45608

25, 52

0.013313

55840

26, 51

0.001817

7620

27, 50

−0.015579

−65344

28, 49

−0.021590

−90556

29, 48

−0.005603

−23502

30, 47

0.022451

94167

31, 46

0.035774

150046

32, 45

0.013541

56796

33, 44

−0.034655

−145352

34, 43

−0.066549

−279128

35, 42

−0.035213

−147694

36, 41

0.071220

298720

37, 40

0.210777

884064

38, 39

0.309200

1296880

NORMALIZED FREQUENCY (× Π RAD/s)

–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

Figure 124. TB1 Filter Response

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