AD9633 datasheet(36/42 Pages) AD

36 / 42 page

Data Sheet

AD9633

Rev. B | Page 35 of 41

Addr

(Hex)

Parameter

Name

Bit 7

(MSB)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

(LSB)

Default

Value

(Hex)

Comments

0x0C

Enhancement

control

Open

Chop

mode

0 = off

1 = on

Open

0x00

Enables/

disables chop

mode.

0x0D

Test mode

(local except

for PN sequence

resets)

User input test mode

00 = single

01 = alternate

10 = single once

11 = alternate

once (affects user input

test

mode only,

Bits[3:0] = 1000)

Reset PN

long gen

Reset PN

short

gen

Output test mode[3:0] (local)

0000 = off (default)

0001 = midscale short

0010 = positive FS

0011 = negative FS

0100 = alternating checkerboard

0101 = PN 23 sequence

0110 = PN 9 sequence

0111 = one/zero word toggle

1000 = user input

1001 = 1-/0-bit toggle

1010 = 1× sync

1011 = one bit high

1100 = mixed bit frequency

0x00

When set,

the test data

is placed on

the output pins

in place of

normal data.

0x10

Offset adjust

(local)

8-bit device offset adjustment[7:0] (local)

Offset adjust in LSBs from +127 to −128 (twos complement format)

0x00

Device offset

trim.

0x14

Output mode

Open

LVDS-ANSI/

LVDS-IEEE

option

0 = LVDS-

ANSI

1 = LVDS-

IEEE reduced

range link

(global)

see Table 18

Open

Output

invert

(local)

Open

Output

format

0 = offset

binary

1 = twos

comple-

ment

(global)

0x01

Configures

the outputs

and the

format of

the data.

0x15

Output adjust

Open

Output driver

termination[1:0]

00 = none

01 = 200 Ω

10 = 100 Ω

11 = 100 Ω

Open

Output

drive

0 = 1×

drive

1 = 2×

drive

0x00

Determines

LVDS or other

output

properties.

0x16

Output phase

Open

Input clock phase adjust[6:4]

(value is number of input

clock cycles of phase delay)

see Table 19

Output clock phase adjust[3:0]

(0000 through 1011)

see Table 20

0x03

On devices

that use

global clock

divide,

determines

which phase

of the divider

output is used

to supply the

output clock.

Internal latching

is unaffected.

0x18

VREF

Open

Internal VREF adjustment

digital scheme[2:0]

000 = 1.0 V p-p

001 = 1.14 V p-p

010 = 1.33 V p-p

011 = 1.6 V p-p

100 = 2.0 V p-p

0x04

Selects and/

or adjusts the

VREF.

0x19

USER_PATT1_LSB

(global)

0x00

User Defined

Pattern 1

LSB.

0x1A

USER_PATT1_MSB

(global)

B15

B14

B13

B12

B11

B10

0x00

User Defined

Pattern 1

MSB.

0x1B

USER_PATT2_LSB

(global)

0x00

User Defined

Pattern 2

LSB.

0x1C

USER_PATT2_MSB

(global)

B15

B14

B13

B12

B11

B10

0x00

User Defined

Pattern 2

MSB.

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