AD9434 datasheet(28/29 Pages) AD

28 / 29 page

Data Sheet

AD9434

Rev. B | Page 27 of 28

Addr.

(Hex)

Bit 7

(MSB)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

(LSB)

Default

Value

(Hex)

Default Notes/

Comments

FLEX_VREF

VREF select

00 = internal VREF

(20 kΩ pull-down)

01 = import VREF

(0.59 V to 0.8 V on

VREF pin)

10 = export VREF

(from internal

reference)

11 = not used

Input voltage range setting:

11100 = 1.60

00101 = 1.36

11101 = 1.58

00110 = 1.34

11110 = 1.55

00111 = 1.31

11111 = 1.52

01000 = 1.28

00000 = 1.50

01001 = 1.26

00001 = 1.47

01010 = 1.23

00010 = 1.44

01011 = 1.20

00011 = 1.42

01100 = 1.18

00100 = 1.39

0x00

USER_PATT1_LSB

0x00

User-defined

pattern, 1 LSB.

USER_PATT1_MSB

0x00

User-defined

pattern, 1 MSB.

USER_PATT2_LSB

0x00

User-defined

pattern, 2 LSBs.

USER_PATT2_MSB

0x00

User-defined

pattern, 2 MSBs.

OVR_CONFIG

OR±

position

(DDR

mode

only):

0 =

Pin 9,

Pin 10

1 =

Pin 21,

Pin 22

OR±

enable:

1 = on

(default)

0 = off

0x01

Input coupling

coupling

enable

0x00

Default is

ac coupling.

X = don’t care.

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