AD9635 datasheet(33/37 Pages) AD

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AD9635

Data Sheet

Rev. B | Page 32 of 36

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

0x21

Serial output data

control (global)

LVDS

output

0 = MSB

first

(default)

1 = LSB

first

SDR/DDR one-lane/two-lane,

bitwise/bytewise, Bits[6:4]

000 = SDR two-lane, bitwise

001 = SDR two-lane, bytewise

010 = DDR two-lane, bitwise

011 = DDR two-lane, bytewise

(default)

100 = DDR one-lane, wordwise

Encode

mode

0 =

normal

encode

rate mode

(default)

1 = low

encode

mode for

sample

rate of

<20 MSPS

0 = 1×

frame

(default)

1 = 2×

frame

Serial output

number of bits

10 = 12 bits (default)

11 = 10 bits

0x32

Serial stream

control.

Sample rate of

<20 MSPS

requires that

Bits[6:4] = 100

(DDR one-lane)

and Bit 3 = 1

(low encode

mode).

0x22

Serial channel

status (local)

Open

Channel

output

reset

Channel

power-

down

0x00

Used to

power down

individual

sections of

a converter.

0x100

Resolution/

sample rate

override

Open

Resolution/

sample rate

override enable

Resolution

10 = 12 bits

11 = 10 bits

Open

Sample rate

000 = 20 MSPS

001 = 40 MSPS

010 = 50 MSPS

011 = 65 MSPS

100 = 80 MSPS

101 = 105 MSPS

110 = 125 MSPS

0x00

Resolution/

sample rate

override

(requires

writing to

the transfer

0x101

User I/O Control 2

Open

SDIO

pull-down

0x00

Disables SDIO

pull-down.

0x102

User I/O Control 3

Open

VCM

power-

down

Open

0x00

VCM control.

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