AD9640 datasheet(46/54 Pages) AD

46 / 54 page

AD9640

Rev. B | Page 44 of 52

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

0x0E

BIST Enable

(Local)

Open

Reset BIST

sequence

Open

BIST enable

0x00

0x10

Offset Adjust

(Local)

Open

Offset adjust in LSBs from +31 to −32

(twos complement format)

0x00

0x14

Output Mode

Drive

strength

0 V to 3.3 V

CMOS or

ANSI

LVDS:

1 V to 1.8 V

CMOS or

reduced:

LVDS

(global)

Output type

0 = CMOS

1 = LVDS

(global)

Open

Output

enable bar

(local)

Open

Output

invert

(local)

00 = offset binary

01 = twos complement

01 = gray code

11 = offset binary

(local)

0x00

Configures the

outputs and

the format of

the data

0x16

Clock Phase

Control

(Global)

Invert DCO

clock

Open

Input clock divider phase adjust

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

0x00

Allows

selection of

clock delays

into the input

clock divider

0x17

DCO Output

Delay (Global)

Open

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

VREF Select

(Global)

Reference voltage selection

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)

Open

0xC0

0x24

BIST Signature

LSB (Local)

BIST signature[7:0]

0x00

Read only

0x25

BIST Signature

MSB (Local)

BIST signature[15:8]

0x00

Read only

Digital Feature Control

0x100

Sync Control

(Global)

SM sync

enable

Open

Clock

divider next

sync only

Clock

divider

sync

enable

Master

sync

enable

0x00

0x104

Fast Detect

Control (Local)

Open

Fast Detect Mode Select[2:0]

Fast detect

enable

0x00

0x106

Fine Upper

Threshold

(Local)

Fine Upper Threshold[7:0]

0x00

0x107

Fine Upper

Threshold

(Local)

Open

Fine Upper Threshold[12:8]

0x00

0x108

Fine Lower

Threshold

(Local)

Fine Lower Threshold[7:0]

0x00

0x109

Fine Lower

Threshold

(Local)

Open

Fine Lower Threshold[12:8]

0x00

AD9640 Datasheet(PDF) 46 Page - Analog Devices

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