AD9652BBCZ-310 datasheet(34/37 Pages) AD

34 / 37 page

Data Sheet

AD9652

Rev. B | Page 33 of 36

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

0x0B

Clock divide

(global)

Clock divide ratio

000 = divide by 1

001 = divide by 2

010 = reserved, do not use

011 = divide by 4

100 = divide by 8

0x00

0x0D

Test mode

(local)

Reset PN23

long gen

PN23:

1 +x17 +

x22

Reset

PN9

short gen

PN9:

1 + x3 + x8

Output test mode

0000 = off (default)

0001 = midscale short

0010 = positive FS

0011 = negative FS

0100 = alternating checkerboard

0101 = PN23 long sequence

0110 = PN9 short sequence

0111 = one/zero word toggle

0x00

When this

set, the test

data is

placed on

the output

pins (D0±

to D15±) in

place of

normal data

0x0F

Common-

mode servo

(global)

Enable

common-

mode

servo

0x00

0x10

Offset adjust

(local)

Offset adjust in LSBs from +127 (0111 1111) to −128 (1000 0000)

(twos complement format)

0x00

0x14

Output

mode (local)

Output format

00 = offset binary

(default)

01 = twos complement

10 = gray code

11 = reserved

0x00

Configures

the outputs

and the

format of

the data

0x15

Output

LVDS

control

(global)

LVDS output drive current adjust

000 = 3.72 mA (ANSI-LVDS,

default)

001 = 3.50 mA

010 = 3.30 mA

011 = 2.96 mA

100 = 2.82 mA

101 = 2.57 mA

110 = 2.27 mA

111 = 2.00 mA (reduced swing

LVDS)

0x00

0x16

Clock phase

adjust

(global)

Input clock divider phase adjust

000 = no delay

001 = 1 input clock cycle

010 = 2 input clock cycle

011 = 3 input clock cycle

100 = 4 input clock cycle

101 = 5 input clock cycle

110 = 6 input clock cycle

111 = 7 input clock cycle

0x00

0x17

DCO±

output delay

(global)

DCO± clock delay

(Delay = (2500 ps × register value/31))

00000 = 0 ps

00001 = 81 ps

00010 = 161 ps

…

11110 = 2419 ps

11111 = 2500 ps

0x00

0x18

Input span

select

(global)

Reserved,

set to 1

Reserved,

set to 1

VREF select

000 = 1.25 V (2.5 V p-p input), default

001 = 1.125 V (2.25 V p-p input)

010 = 1.20 V (2.4 V p-p input)

011 = 1.25 V (2.5 V p-p input)

100 = do not use

101 = 1.0 V (2.0 V p-p input)

0xC0

0x30

Dither (local)

Dither

enable

0x00

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