AD9260(2000) Ver la hoja de datos (PDF) - Analog Devices

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AD9260
(Rev.:2000)

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

Analog Devices 

AD9260

Table I. Integer Filter Coefficients for First Stage Decimation

Filter (23-Tap Halfband FIR Filter)

Lower

Coefficient

H(1)

H(2)

H(3)

H(4)

H(5)

H(6)

H(7)

H(8)

H(9)

H(10)

H(11)

H(12)

Upper

Coefficient

H(23)

H(22)

H(21)

H(20)

H(19)

H(18)

H(17)

H(16)

H(15)

H(14)

H(13)

Integer

Value

–1

0

13

0

–66

0

224

0

–642

0

2496

4048

Table II. Integer Filter Coefficients for Second Stage Decima-

tion Filter (43-Tap Halfband FIR Filter)

Lower

Coefficient

H(1)

H(2)

H(3)

H(4)

H(5)

H(6)

H(7)

H(8)

H(9)

H(10)

H(11)

H(12)

H(13)

H(14)

H(15)

H(16)

H(17)

H(18)

H(19)

H(20)

H(21)

H(22)

Upper

Coefficient

H(43)

H(42)

H(41)

H(40)

H(39)

H(38)

H(37)

H(36)

H(35)

H(34)

H(33)

H(32)

H(31)

H(30)

H(29)

H(28)

H(27)

H(26)

H(25)

H(24)

H(23)

Integer

Value

3

0

–12

0

35

0

–83

0

172

0

–324

0

572

0

–976

0

1680

0

–3204

0

10274

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

8× 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

Coefficient

H(1)

H(2)

H(3)

H(4)

H(5)

H(6)

H(7)

H(8)

H(9)

H(10)

H(11)

H(12)

H(13)

H(14)

H(15)

H(16)

H(17)

H(18)

H(19)

H(20)

H(21)

H(22)

H(23)

H(24)

H(25)

H(26)

H(27)

H(28)

H(29)

H(30)

H(31)

H(32)

H(33)

H(34)

H(35)

H(36)

H(37)

H(38)

H(39)

H(40)

H(41)

H(42)

H(43)

H(44)

H(45)

H(46)

H(47)

H(48)

H(49)

H(50)

H(51)

H(52)

H(53)

H(54)

Upper

Coefficient

H(107)

H(106)

H(105)

H(104)

H(103)

H(102)

H(101)

H(100)

H(99)

H(98)

H(97)

H(96)

H(95)

H(94)

H(93)

H(92)

H(91)

H(90)

H(89)

H(88)

H(87)

H(86)

H(85)

H(84)

H(83)

H(82)

H(81)

H(80)

H(79)

H(78)

H(77)

H(76)

H(75)

H(74)

H(73)

H(72)

H(71)

H(70)

H(69)

H(68)

H(67)

H(66)

H(65)

H(64)

H(63)

H(62)

H(61)

H(60)

H(59)

H(58)

H(57)

H(56)

H(55)

Integer

Value

–1

0

2

0

–2

0

3

0

–3

0

1

0

3

0

–12

0

27

0

–50

0

85

0

–135

0

204

0

–297

0

420

0

–579

0

784

0

–1044

0

1376

0

–1797

0

2344

0

–3072

0

4089

0

–5624

0

8280

0

–14268

0

43520

68508

REV. B

–7–

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