AD9691 datasheet(39/73 Pages) AD

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AD9691

Data Sheet

Rev. 0 | Page 38 of 72

–120

–100

–80

–60

–40

–20

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

NORMALIZED FREQUENCY (× π RAD/SAMPLE)

Figure 67. HB2 Filter Response

HB1 Filter

The fourth and final decimate by 2, half-band, low-pass FIR

filter (HB1) uses a 55-tap, symmetrical, fixed coefficient filter

implementation that is optimized for low power consumption.

The HB1 filter is always enabled and cannot be bypassed. Table 22

and Figure 68 show the coefficients and response of the HB1 filter.

–120

–100

–80

–60

–40

–20

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

NORMALIZED FREQUENCY (× π RAD/SAMPLE)

Figure 68. HB1 Filter Response

Table 22. HB1 Filter Coefficients

HB1 Coefficient

Number

Normalized

Coefficient

Decimal

Coefficient (21-Bit)

C1, C55

−0.000023

−24

C2, C54

C3, C53

0.000097

102

C4, C52

C5, C51

−0.000288

−302

C6, C50

C7, C49

0.000696

730

C8, C48

C9, C47

−0.0014725

−1544

C10, C46

C11, C45

0.002827

2964

C12, C44

C13, C43

−0.005039

−5284

C14, C42

C15, C41

0.008491

8903

C16, C40

C17, C39

−0.013717

−14,383

C18, C38

C19, C37

0.021591

22,640

C20, C36

C21, C35

−0.033833

−35,476

C22, C34

C23, C33

0.054806

57,468

C24, C32

C25, C31

−0.100557

−105,442

C26, C30

C27, C29

0.316421

331,792

C28

0.500000

524,288

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