AD9260_15 datasheet(8/44 Pages) AD

Part #	AD9260

Description	High Speed Oversampling CMOS ADC with 16-Bit Resolution at a 2.5 MHz Output Word Rate

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AD9260

Rev. C | Page 8 of 44

Table 5. Integer Filter Coefficients for First Stage

Decimation Filter (23-Tap Half-Band FIR Filter)

Lower Coefficient

Upper Coefficient

Integer Value

H(1)

H(23)

–1

H(2)

H(22)

0

H(3)

H(21)

13

H(4)

H(20)

0

H(5)

H(19)

–66

H(6)

H(18)

0

H(7)

H(17)

224

H(8)

H(16)

0

H(9)

H(15)

–642

H(10)

H(14)

0

H(11)

H(13)

2496

H(12)

4048

Table 6. Integer Filter Coefficients for Second Stage

Decimation Filter (43-Tap Half-Band FIR Filter)

Lower Coefficient

Upper Coefficient

Integer Value

H(1)

H(43)

3

H(2)

H(42)

0

H(3)

H(41)

–12

H(4)

H(40)

0

H(5)

H(39)

35

H(6)

H(38)

0

H(7)

H(37)

–83

H(8)

H(36)

0

H(9)

H(35)

172

H(10)

H(34)

0

H(11)

H(33)

–324

H(12)

H(32)

0

H(13)

H(31)

572

H(14)

H(30)

0

H(15)

H(29)

–976

H(16)

H(28)

0

H(17)

H(27)

1680

H(18)

H(26)

0

H(19)

H(25)

–3204

H(20)

H(24)

0

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 between samples). Similarly, the composite filter

coefficients in the 8× decimation mode can be determined by

convolving the taps of the composite 4× decimation mode (as

previously determined) with a “zero stuffed” version of the third

stage filter taps (i.e., insert three zeros between samples).

Table 7. Integer Filter Coefficients for Third Stage

Decimation Filter (107-Tap Half-Band FIR Filter)

Lower Coefficient

Upper Coefficient

Integer Value

H(1)

H(107)

–1

H(2)

H(106)

0

H(3)

H(105)

2

H(4)

H(104)

0

H(5)

H(103)

–2

H(6)

H(102)

0

H(7)

H(101)

3

H(8)

H(100)

0

H(9)

H(99)

–3

H(10)

H(98)

0

H(11)

H(97)

1

H(12)

H(96)

0

H(13)

H(95)

3

H(14)

H(94)

0

H(15)

H(93)

–12

H(16)

H(92)

0

H(17)

H(91)

27

H(18)

H(90)

0

H(19)

H(89)

–50

H(20)

H(88)

0

H(21)

H(87)

85

H(22)

H(86)

0

H(23)

H(85)

–135

H(24)

H(84)

0

H(25)

H(83)

204

H(26)

H(82)

0

H(27)

H(81)

–297

H(28)

H(80)

0

H(29)

H(79)

420

H(30)

H(78)

0

H(31)

H(77)

–579

H(32)

H(76)

0

H(33)

H(75)

784

H(34)

H(74)

0

H(35)

H(73)

–1044

H(36)

H(72)

0

H(37)

H(71)

1376

H(38)

H(70)

0

H(39)

H(69)

–1797

H(40)

H(68)

0

H(41)

H(67)

2344

H(42)

H(66)

0

H(43)

H(65)

–3072

H(44)

H(64)

0

H(45)

H(63)

4089

H(46)

H(62)

0

H(47)

H(61)

–5624

H(48)

H(60)

0

H(49)

H(59)

8280

H(50)

H(58)

0

H(51)

H(57)

–14268

H(52)

H(56)

0

H(53)

H(55)

43520

H(54)

68508

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