AD9645 datasheet(30/36 Pages) AD

30 / 36 page

AD9645

Data Sheet

Rev. 0 | Page 30 of 36

MEMORY MAP REGISTER TABLE

The AD9645 uses a 3-wire interface and 16-bit addressing and,

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 16.

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]

AD9645 0x8B = dual, 14-bit, 80 MSPS/125 MSPS, serial LVDS

0x8B

Unique chip

ID used to

differentiate

devices;

read only.

0x02

Chip grade

(global)

Open

Speed grade ID, Bits[6:4]

100 = 80 MSPS

110 = 125 MSPS

Open

Unique speed

grade ID used

to differentiate

graded

devices;

read only.

Device Index and Transfer Registers

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.

0xFF

Transfer

Open

Initiate

override

0x00

Set

resolution/

sample rate

override.

Global ADC Function Registers

0x08

Power modes

(global)

Open

Power mode

00 = chip run

01 = full power-down

10 = standby

11 = reset

0x00

Determines

various

generic

modes of chip

operation.

0x09

Clock (global)

Open

Duty cycle

stabilizer

0 = off

1 = on

0x00

Turns

duty cycle

stabilizer on

or off.

0x0B

Clock divide

(global)

Open

Clock divide ratio[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

0x0C

Enhancement

control

Open

Chop

mode

0 = off

1 = on

Open

0x00

Enables/

disables

chop mode.

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