AD9268 datasheet(39/45 Pages) AD

39 / 45 page

AD9268

Rev. A | Page 38 of 44

MEMORY MAP REGISTER TABLE

All address and bit locations that are not included in Table 17 are not currently supported for this device.

Table 17. Memory Map Registers

Address

(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

Chip Configuration Registers

0x00

SPI port

configuration

(global)

LSB first

Soft reset

LSB first

0x18

The nibbles

are mirrored

so LSB-first

mode or MSB-

first mode

registers

correctly,

regardless of

shift mode

0x01

Chip ID

(global)

8-bit Chip ID[7:0]

(AD9268 = 0x32)

(default)

0x32

Read only

0x02

Chip grade

(global)

Open

Speed grade ID

01 = 125 MSPS

10 = 105 MSPS

11 = 80 MSPS

Open

Speed grade

ID used to

differentiate

devices; read

only

Channel Index and Transfer Registers

0x05

Channel

index

Open

Data

Channel

(default)

Data

Channel A

(default)

0x03

Bits are set

to determine

which device

on the chip

receives the

next write

command;

applies to local

registers only

0xFF

Transfer

Open

Transfer

0x00

Synchronously

transfers data

from the

master shift

slave

ADC Functions

0x08

Power modes

(local)

Open

External

power-

down pin

function

(local)

0 = pdwn

1 = stndby

Open

Internal power-down

mode (local)

00 = normal operation

01 = full power-down

10 = standby

11 = normal operation

0x80

Determines

various generic

modes of chip

operation

0x09

Global clock

(global)

Open

Duty cycle

stabilizer

(default)

0x01

0x0B

Clock divide

(global)

Open

Clock divide ratio

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

Clock divide

values other

than 000

automatically

cause the duty

cycle stabilizer

to become

active

0x0D

Test mode

(local)

Open

Reset PN

long gen

Reset

PN short

gen

Open

Output test mode

000 = off (default)

001 = midscale short

010 = positive FS

011 = negative FS

100 = alternating checkerboard

101 = PN long sequence

110 = PN short sequence

111 = one/zero word toggle

0x00

When this

the test data

is placed on

the output

pins in place of

normal data

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