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AD9786

Rev. 0 | Page 25 of 60

DIGITAL FILTER SPECIFICATIONS

DIGITAL INTERPOLATION FILTER COEFFICIENTS

Table 23. Stage 1 Interpolation Filter Coefficients

Lower Coefficient

Upper Coefficient

Integer Value

H(1)

H(43)

H(2)

H(42)

H(3)

H(41)

–27

H(4)

H(40)

H(5)

H(39)

H(6)

H(38)

H(7)

H(37)

–131

H(8)

H(36)

H(9)

H(35)

239

H(10)

H(34)

H(11)

H(33)

–407

H(12)

H(32)

H(13)

H(31)

665

H(14)

H(30)

H(15)

H(29)

–1070

H(16)

H(28)

H(17)

H(27)

1764

H(18)

H(26)

H(19)

H(25)

–3273

H(20)

H(24)

H(21)

H(23)

10358

H(22)

16384

Table 24. Stage 2 Interpolation Filter Coefficients

Lower Coefficient

Upper Coefficient

Integer Value

H(1)

H(19)

H(2)

H(18)

H(3)

H(17)

–120

H(4)

H(16)

H(5)

H(15)

436

H(6)

H(14)

H(7)

H(13)

–1284

H(8)

H(12)

H(9)

H(11)

5045

H(10)

8192

Table 25. Stage 3 Interpolation Filter Coefficients

Lower Coefficient

Upper Coefficient

Integer Value

H(1)

H(11)

H(2)

H(10)

H(3)

H(9)

–53

H(4)

H(8)

H(5)

H(7)

302

H(6)

512

0.5

–0.5

–0.4

–0.3

–0.2

–0.1

0.1

0.2

0.3

0.4

–140

–20

–40

–60

–80

–100

–120

Figure 41. ×2 Interpolation Filter Response

0.5

–0.5

–0.4

–0.3

–0.2

–0.1

0.1

0.2

0.3

0.4

–140

–20

–40

–60

–80

–100

–120

Figure 42. ×4 Interpolation Filter Response

0.5

–0.5

–0.4

–0.3

–0.2

–0.1

0.1

0.2

0.3

0.4

–140

–20

–40

–60

–80

–100

–120

Figure 43. ×8 Interpolation Filter Response

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