AD9255 datasheet(39/45 Pages) AD

39 / 45 page

AD9255

Data Sheet

Rev. C | Page 38 of 44

Addr.

(Hex)

Name

Bit 7 (MSB)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0 (LSB)

Default

Value

(Hex)

Default Notes/

Comments

0x14

Output

mode

Drive

strength

Output

type

Open

Output

enable

bar

Open

Output

invert

Output

format

0x00

Configures the

outputs and

the format of

the data

0 = ANSI

LVDS

0 =

CMOS

00 = offset

binary

1 = reduced

LVDS

1 = LVDS

01 = twos

complement

01 = gray code

11 = offset binary

0x16

Clock phase

control

Invert DCO

clock

Open

Input clock divider phase adjust

0x00

Allows

selection of

clock delays

into the input

clock divider

000 = no delay

001 = 1 input clock cycle

010 = 2 input clock cycles

011 = 3 input clock cycles

100 = 4 input clock cycles

101 = 5 input clock cycles

110 = 6 input clock cycles

111 = 7 input clock cycles

0x17

DCO output

delay

Open

DCO clock delay

0x00

(delay = 2500 ps × register value/31)

00000 = 0 ps

00001 = 81 ps

00010 = 161 ps

…

11110 = 2419 ps

11111 = 2500 ps

0x18

VREF select

Reference voltage

selection

Open

0xC0

00 = 1.25 V p-p

01 = 1.5 V p-p

10 = 1.75 V p-p

11 = 2.0 V p-p (default)

0x24

BIST

signature LSB

BIST Signature[7:0]

0x00

Read only

0x25

BIST

signature

MSB

BIST Signature[15:8]

0x00

Read only

0x30

Dither

enable

Open

Dither

enable

Open

0x00

Digital Feature Control Register

0x100

Sync control

Open

Clock

divider

next sync

only

Clock

divider

sync

enable

Master

sync

enable

0x00

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