AD9637 datasheet(32/41 Pages) AD

32 / 41 page

Data Sheet

AD9637

Rev. A | Page 31 of 40

MEMORY MAP REGISTER TABLE

The AD9637 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 Register 0x00, Bit 5 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 17. Memory Map Register Table

Reg.

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

The nibbles

are mirrored

so that LSB or

MSB first

mode registers

correctly. The

default for

the ADCs is

16-bit mode.

0x01

Chip ID (global)

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

AD9637 0x93 = octal 12-bit 40 MSPS/80 MSPS serial LVDS

Read

only

0x93

Unique chip ID

that is used to

differentiate

devices; read

only.

0x02

Chip grade

(global)

Open

Speed grade ID, Bits[6:4]

001 = 40 MSPS

100 = 80 MSPS

Open

Read

only

Unique speed

grade ID that

is used to

differentiate

graded

devices; read

only.

Device Index and Transfer Registers

0x04

Device Index 2

Open

Data

ChannelH

Data

Channel G

Data

Channel F

Data

Channel E

0xF

Bits are set to

determine

which device

on chip

receives the

next write

command.

The default is

all devices on

chip.

0x05

Device Index 1

Open

Clock

Channel

DCO

Clock

Channel

FCO

Data

ChannelD

Data

Channel C

Data

Channel B

Data

Channel A

0x3F

Bits are set

to determine

which device

on chip

receives the

next write

command.

The default is

all devices on

chip.

0xFF

Transfer

Open

Initiate

override

0x00

Set

resolution/

sample rate

override.

Global ADC Functions

0x08

Power modes

(global)

Open

External

power-

down

function

0 = full

power-

down

1 =

standby

Open

Internal power-down

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

0x01

Turns duty

cycle

stabilizer on

or off.

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