AD9260AS datasheet(7/36 Pages) AD

7 / 36 page

AD9260

–7–

REV. B

Table I. Integer Filter Coefficients for First Stage Decimation

Filter (23-Tap Halfband FIR Filter)

Lower

Upper

Integer

Coefficient

Value

H(1)

H(23)

–1

H(2)

H(22)

H(3)

H(21)

H(4)

H(20)

H(5)

H(19)

–66

H(6)

H(18)

H(7)

H(17)

224

H(8)

H(16)

H(9)

H(15)

–642

H(10)

H(14)

H(11)

H(13)

2496

H(12)

4048

Table II. Integer Filter Coefficients for Second Stage Decima-

tion Filter (43-Tap Halfband FIR Filter)

Lower

Upper

Integer

Coefficient

Value

H(1)

H(43)

H(2)

H(42)

H(3)

H(41)

–12

H(4)

H(40)

H(5)

H(39)

H(6)

H(38)

H(7)

H(37)

–83

H(8)

H(36)

H(9)

H(35)

172

H(10)

H(34)

H(11)

H(33)

–324

H(12)

H(32)

H(13)

H(31)

572

H(14)

H(30)

H(15)

H(29)

–976

H(16)

H(28)

H(17)

H(27)

1680

H(18)

H(26)

H(19)

H(25)

–3204

H(20)

H(24)

H(21)

H(23)

10274

H(22)

16274

NOTE: The composite filter undecimated coefficients (i.e.,

impulse response) in the 4

× decimation mode can be determined

by convolving the first stage filter taps with a “zero stuffed”

version of the second stage filter taps (i.e., insert one zero be-

tween samples). Similarly, the composite filter coefficients in the

× decimation mode can be determined by convolving the taps

of the composite 4

× decimation mode (as previously deter-

mined) with a “zero stuffed” version of the third stage filter taps

(i.e., insert three zeros between samples).

Table III. Integer Filter Coefficients for Third Stage Decima-

tion Filter (107-Tap Halfband FIR Filter)

Lower

Upper

Integer

Coefficient

Value

H(1)

H(107)

–1

H(2)

H(106)

H(3)

H(105)

H(4)

H(104)

H(5)

H(103)

–2

H(6)

H(102)

H(7)

H(101)

H(8)

H(100)

H(9)

H(99)

–3

H(10)

H(98)

H(11)

H(97)

H(12)

H(96)

H(13)

H(95)

H(14)

H(94)

H(15)

H(93)

–12

H(16)

H(92)

H(17)

H(91)

H(18)

H(90)

H(19)

H(89)

–50

H(20)

H(88)

H(21)

H(87)

H(22)

H(86)

H(23)

H(85)

–135

H(24)

H(84)

H(25)

H(83)

204

H(26)

H(82)

H(27)

H(81)

–297

H(28)

H(80)

H(29)

H(79)

420

H(30)

H(78)

H(31)

H(77)

–579

H(32)

H(76)

H(33)

H(75)

784

H(34)

H(74)

H(35)

H(73)

–1044

H(36)

H(72)

H(37)

H(71)

1376

H(38)

H(70)

H(39)

H(69)

–1797

H(40)

H(68)

H(41)

H(67)

2344

H(42)

H(66)

H(43)

H(65)

–3072

H(44)

H(64)

H(45)

H(63)

4089

H(46)

H(62)

H(47)

H(61)

–5624

H(48)

H(60)

H(49)

H(59)

8280

H(50)

H(58)

H(51)

H(57)

–14268

H(52)

H(56)

H(53)

H(55)

43520

H(54)

68508

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