AD9776-EB datasheet(34/56 Pages) AD

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AD9776/AD9778/AD9779

Rev. A | Page 34 of 56

Table 17. Interpolation Filter Modes, (Register 0x01, Bits<5:2>)

Interpolation

Factor <7:6>

Filter

Mode

<5:2>

Modulation

Nyquist

Zone

Pass

Band

F_Low1

Center1

F_High1

Comments

0x00

−0.05

+0.05

0x01

DC shifted

0.0125

0.0625

0.1125

0x02

F/8

0.075

0.125

0.175

0x03

F/8 shifted

0.1375

0.1875

0.2375

0x04

F/4

0.2

0.25

0.3

0x05

F/4 shifted

0.2625

0.3125

0.3625

0x06

3F/8

0.325

0.375

0.425

0x07

3F/8 shifted

0.3875

0.4375

0.4875

0x08

F/2

−8

−0.55

−0.5

−0.45

0x09

F/2 shifted

−7

−0.4875

−0.4375

−0.3875

0x0A

−3F/8

−6

−0.425

−0.375

−0.343

0x0B

−3F/8 shifted

−5

−0.3625

−0.3125

−0.2625

0x0C

−F/4

−4

−0.3

−0.25

−0.2

0x0D

−F/4 shifted

−3

−0.2375

−0.1875

−0.1375

0x0E

−F/8

−2

−0.175

−0.125

−0.075

0x0F

−F/8 shifted

−1

−0.1125

−0.0625

−0.0125

In 8× interpolation;

BW (min) = 0.0375 × fDAC

BW (max) = 0.1 × fDAC

0x00

−0.1

+0.1

0x01

DC shifted

0.025

0.125

0.225

0x02

F/4

0.15

0.25

0.35

0x03

F/4 shifted

0.275

0.375

0.475

0x04

F/2

−4

−0.6

−0.5

−0.4

0x05

F/2 shifted

−3

−0.475

−0.375

−0.275

0x06

−F/4

−2

−0.35

−0.25

−0.15

0x07

−F/4 shifted

−1

−0.225

−0.125

−0.025

In 4× interpolation;

BW (min) = 0.075 × fDAC

BW (max) = 0.2 × fDAC

0x00

−0.2

+0.2

0x01

DC shifted

0.05

0.25

0.45

0x02

F/2

−2

−0.7

−0.5

−0.3

0x03

F/2 shifted

−1

−0.45

−0.25

−0.05

In 2× interpolation;

BW (min) = 0.15 × fDAC

BW (max) = 0.4 × fDAC

1 Frequency normalized to fDAC.

AD9776-EB Datasheet(PDF) 34 Page - Analog Devices

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