AD9655 datasheet(32/38 Pages) AD

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Data Sheet

AD9655

MEMORY MAP REGISTER TABLE

The AD9655 uses a 3-wire interface and 16-bit addressing;

therefore, Bit 0 and Bit 7 in Register 0x00 are set to 0, and Bit 3

and Bit 4 are set to 1.

When Bit 5 in Register 0x00 is set high, the SPI enters a soft

reset, where all of the user registers revert to their default values

and Bit 2 is automatically cleared.

Table 18.

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

Chip Configuration Registers

0x00

SPI port

configuration

0 = SDO

active

LSB first

Soft reset

1 = 16-bit

address

1 =

16-bit

address

Soft reset

LSB first

0 = SDO

active

0x18

Nibbles are

mirrored to

allow a given

to perform

the same

function for

either MSB

first or LSB

first mode.

0x01

Chip ID (global)

8-bit chip ID, Bits[7:0]

0xC2 = AD9655, dual, 16-bit, 125 MSPS, serial LVDS

0xC2

Unique chip

ID used to

differentiate

devices;

read only.

0x02

Chip grade

(global)

Open

Speed grade ID, Bits[6:4]

110 = 125 MSPS

Revision, Bits[3:0]

0x62

Unique speed

grade ID used

to differentiate

graded

devices;

read only.

Device Index Register

0x05

Device index

Open

Clock

channel

DCO

Clock channel

FCO

Open

Data

Channel B

Data

Channel A

0x33

Bits are set to

determine

which device

on chip

receives the

next write

command.

Default is all

devices on

chip.

Global ADC Function Registers

0x08

Power modes

(global)

Open

Power mode

00 = chip run

01 = full power-down

10 = standby

11 = digital reset

0x00

Determines

various

generic

modes of chip

operation.

0x09

Clock (global)

Open

DCS

bypass

0 =

inactive

1 =

active

Open

DCS

0 = off

1 = on

0x04

DCS controls.

Bit 2 = 1

bypasses the

clock divider

as well as

DCS.

0x0B

Clock divide

(global)

Open

Clock divide ratio, Bits[2:0]

000 = divide by 1

001 = divide by 2

010 = divide by 3

011 = divide by 4

100 = divide by 5

101 = divide by 6

110 = divide by 7

111 = divide by 8

0x00

Setting

Bit 2 = 1

bypasses the

clock divider

as well as

DCS.

0x0C

Enhancement

control

Open

Chop

mode

0 = off

1 = on

Open

0x00

Enables/

disables

chop mode.

Rev. 0 | Page 31 of 37

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