AD9772AAST データシートの表示（PDF） - Analog Devices

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AD9772AAST

0.3-7V; 14-bit, 160MSPS TxDAC+ with 2X interpolation filter

Analog Devices 

AD9772A

DIGITAL FILTER SPECIFICATIONS (TMIN to TMAX, AVDD = 3.3 V, CLKVDD = 3.3 V, PLLVDD = 0 V, DVDD = 3.3 V, IOUTFS = 20 mA,

differential transformer coupled output, 50 ⍀ doubly terminated, unless otherwise noted.)

Parameter

Min

MAXIMUM INPUT DATA RATE (fDATA)

150

DIGITAL FILTER CHARACTERISTICS

Passband Width1: 0.005 dB

Passband Width: 0.01 dB

Passband Width: 0.1 dB

Passband Width: –3 dB

LINEAR PHASE (FIR IMPLEMENTATION)

STOPBAND REJECTION

0.606 fCLOCK to 1.394 fCLOCK

GROUP DELAY2

IMPULSE RESPONSE DURATION

–40 dB

–60 dB

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.

Typ

0.401

0.404

0.422

0.479

73

21

36

42

Max

Unit

MSPS

fOUT/fDATA

fOUT/fDATA

fOUT/fDATA

fOUT/fDATA

dB

Input Clocks

Input Clocks

Input Clocks

0

–20

–40

–60

–80

–100

–120

–140

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

FREQUENCY – DC TO fDATA

Figure 2a. FIR Filter Frequency Response—Baseband Mode

1

0.8

0.6

0.4

0.2

0

–0.2

–0.4

0

5 10 15 20 25 30 35 40 45

TIME – Samples

Figure 2b. FIR Filter Impulse Response—Baseband Mode

Table I. Integer Filter Coefficients for Interpolation Filter

(43-Tap Half-Band 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

10

0

–31

0

69

0

–138

0

248

0

–419

0

678

0

–1083

0

1776

0

–3282

0

10364

16384

REV. A

–5–

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