AD9774

–5–

REV. B

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily

accumulate on the human body and test equipment and can discharge without detection.

Although the AD9774 features proprietary ESD protection circuitry, permanent damage may

occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD

precautions are recommended to avoid performance degradation or loss of functionality.

Table I. Integer Filter Coefficients for First Stage Interpola-

tion Filter (55-Tap Halfband FIR Filter)

Lower

Upper

Integer

Coefficient

Coefficient

Value

H(1)

H(55)

–1

H(2)

H(54)

0

H(3)

H(53)

3

H(4)

H(52)

0

H(5)

H(51)

–7

H(6)

H(50)

0

H(7)

H(49)

15

H(8)

H(48)

0

H(9)

H(47)

–28

H(10)

H(46)

0

H(11)

H(45)

49

H(12)

H(44)

0

H(13)

H(43)

–81

H(14)

H(42)

0

H(15)

H(41)

128

H(16)

H(40)

0

H(17)

H(39)

–196

H(18)

H(38)

0

H(19)

H(37)

295

H(20)

H(36)

0

H(21)

H(35)

–447

H(22)

H(34)

0

H(23)

H(33)

706

H(24)

H(32)

0

H(25)

H(31)

–1274

H(26)

H(30)

0

H(27)

H(29)

3976

H(28)

6276

Table II. Integer Filter Coefficients for Second Stage Inter-

polation Filter (23-Tap Halfband FIR Filter)

Lower

Upper

Integer

Coefficient

Coefficient

Value

H(1)

H(23)

–6

H(2)

H(22)

0

H(3)

H(21)

37

H(4)

H(20)

0

H(5)

H(19)

–125

H(6)

H(18)

0

H(7)

H(17)

316

H(8)

H(16)

0

H(9)

H(15)

–736

H(10)

H(14)

0

H(11)

H(13)

2562

H(12)

4096

FREQUENCY – DC TO 2

0

–20

–180

0

0.5

–80

–120

–140

–160

–40

–60

–100

1.0

1.5

2.0

Figure 2a. FIR Filter Frequency Response

TIME – Samples

1.0

–0.4

0

80

10

20

30

40

50

60

70

0.8

0.4

0.2

0.0

–0.2

0.6

Figure 2b. FIR Filter Impulse Response

WARNING!

ESD SENSITIVE DEVICE