AD9772AST datasheet(5/30 Pages) AD

5 / 30 page

REV. 0

–5–

AD9772

DIGITAL FILTER SPECIFICATIONS (T

MIN to TMAX, AVDD = +3 V, CLKVDD = +3 V, PLLVDD = 0 V, DVDD = +3 V,

IOUTFS = 20 mA, Differential Transformer Coupled Output, 50

Doubly Terminated, unless otherwise noted)

Parameter

Min

Typ

Max

Units

MAXIMUM INPUT DATA RATE (fDATA)

150

MSPS

DIGITAL FILTER CHARACTERISTICS

Passband Width1: 0.005 dB

0.401

fOUT/fDATA

Passband Width: 0.01 dB

0.404

fOUT/fDATA

Passband Width: 0.1 dB

0.422

fOUT/fDATA

Passband Width: –3 dB

0.479

fOUT/fDATA

LINEAR PHASE (FIR IMPLEMENTATION)

STOPBAND REJECTION

0.606 fCLOCK to 1.394 fCLOCK

GROUP DELAY2

Input Clocks

IMPULSE RESPONSE DURATION

–40 dB

Input Clocks

–60 dB

Input Clocks

NOTES

1Excludes sin(x)/x characteristic of DAC.

2Defined as the number of data clock cycles between impulse input and peak of output response.

Specifications subject to change without notice.

FREQUENCY – DC TO fDATA

–140

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

–20

–40

–60

–80

–100

–120

Figure 2a. FIR Filter Frequency Response—Baseband Mode

TIME – Samples

–0.4

0.8

0.6

0.4

0.2

–0.2

Figure 2b. FIR Filter Impulse Response—Baseband Mode

Table I. Integer Filter Coefficients for Interpolation Filter

(43-Tap Half-Band FIR Filter)

Lower

Upper

Integer

Coefficient

Value

H(1)

H(43)

H(2)

H(42)

H(3)

H(41)

–31

H(4)

H(40)

H(5)

H(39)

H(6)

H(38)

H(7)

H(37)

–138

H(8)

H(36)

H(9)

H(35)

248

H(10)

H(34)

H(11)

H(33)

–419

H(12)

H(32)

H(13)

H(31)

678

H(14)

H(30)

H(15)

H(29)

–1083

H(16)

H(28)

H(17)

H(27)

1776

H(18)

H(26)

H(19)

H(25)

–3282

H(20)

H(24)

H(21)

H(23)

10364

H(22)

16384

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