AD6655 datasheet(52/85 Pages) AD

52 / 85 page

Data Sheet

AD6655

Rev. B | Page 51 of 84

MEMORY MAP REGISTER TABLE

All address and bit locations that are not included in Table 29 are not currently supported for this device.

Table 29. Memory Map Registers

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

Chip Configuration Registers

0x00

SPI Port

Configuration

(Global)

LSB first

Soft reset

Soft

reset

LSB first

0x18

The nibbles

are mirrored

so that

LSB-first or

MSB-first

mode

registers

correctly,

regardless of

shift mode

0x01

Chip ID

(Global)

8-bit Chip ID[7:0]

(AD6655 = 0x0D)

(default)

0x0D

Default is

unique chip

ID, different

for each

device; this is

a read-only

0x02

Chip Grade

(Global)

Open

Speed Grade ID[4:3]

00 = 150 MSPS

01 = 125 MSPS

10 = 105 MSPS

11 = 80 MSPS

Open

Speed grade

ID used to

differentiate

devices; this

is a read-only

Channel Index and Transfer Registers

0x05

Channel

Index

Open

Data

Channel B

(default)

Data

Channel A

(default)

0x03

Bits are set to

determine

which device

on chip

receives the

next write

command;

applies to

local registers

0xFF

Transfer

Open

Transfer

0x00

Synchronously

transfers data

from the

master shift

the slave

ADC Function Registers

0x08

Power Modes

Open

External

power-

down pin

function

(global)

0 = pdwn

1 = stndby

Open

Internal power-down

mode (local)

00 = normal operation

01 = full power-down

10 = standby

11 = normal operation

0x00

Determines

various

generic

modes of chip

operation

0x09

Global Clock

(Global)

Open

Duty cycle

stabilize

(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

activate

duty cycle

stabilization

AD6655 Datasheet(PDF) 52 Page - Analog Devices

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