AD6674 datasheet(89/97 Pages) AD

89 / 97 page

AD6674

Data Sheet

Rev. C | Page 88 of 96

Reg.

Addr.

(Hex)

Name

Bit 7

(MSB)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0 (LSB)

Default

Notes

0x371

DDC 3

input

selection

Q input

select

0 = Ch. A

1 = Ch. B

I input

select

0 = Ch. A

1 = Ch. B

0x05

0x374

DDC 3

frequency

LSB

DDC3 NCO FTW[7:0] twos complement

0x00

0x375

DDC 3

frequency

MSB

DDC3 NCO FTW[11:8] twos complement

0x00

0x380

DDC 3

phase LSB

DDC3 NCO POW[7:0] twos complement

0x00

0x381

DDC 3

phase MSB

DDC3 NCO POW[11:8] twos complement

0x00

0x387

DDC 3

output test

mode

selection

I output

test mode

enable

0 =

disabled

1 =

enabled

from Ch. A

0x00

NSR Decimate by 2 and Noise Shaping Requantizer (NSR)

0x41E

NSR

decimate

by 2

High-

pass/

low-pass

mode:

0 =

enable

LPF

1 =

enable

HPF

NSR

decimate

by 2

enable

0 =

disabled

1 =

enabled

0x01;

0x00

for

AD6674

-500

Bit 0 is

ignored

AD6674

-750

and

AD6674

-1000

when in

NSR

mode

0x420

NSR mode

000 = 21% BW mode

001 = 28% BW mode

0x00

0x422

NSR tuning

NSR tuning word; see the Noise Shaping Requantizer (NSR) section; equations

for the tuning word are dependent on the NSR mode

0x00

Variable Dynamic Range (VDR)

0x430

VDR control

VDR BW

mode

0 = 25%

mode

1 = 43%

mode

(only

available

for dual

complex

mode)

0 = dual

real mode

1 = dual

complex

mode

(Channel A

= I,

Channel B

= Q)

0x01

0x434

VDR tuning

VDR center frequency; see the Variable Dynamic

Range (VDR) section for more details on the center

frequency, which is dependent on the VDR mode

0x00

Digital Outputs and Test Modes

AD6674 Datasheet(PDF) 89 Page - Analog Devices

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