AD6643 datasheet(31/36 Pages) AD

Part #	AD6643

Description	Dual IF Receiver 1.8 V supply voltages Internal ADC voltage reference

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Manufacturer	AD [Analog Devices]

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AD6643

Rev. 0 | Page 31 of 36

Addr

(Hex)

Register

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

0x0D

Test mode

(local)

User test

mode

control

0 =

continuous/

repeat

pattern

1 = single

pattern then

zeros

Open

Reset PN

long gen

Reset

PN

short

gen

Output test mode

0000 = off (default)

0001 = midscale short

0010 = positive FS

0011 = negative FS

0100 = alternating checkerboard

0101 = PN long sequence

0110 = PN short sequence

0111 = one/zero word toggle

1000 = user test mode

1001 to 1110 = unused

1111 = ramp output

0x00

When this

register is set,

the test data

is placed on the

output pins in

place of normal

data

0x0E

BIST enable

(local)

Open

Reset BIST

sequence

Open

BIST

enable

0x00

0x10

Offset adjust

(local)

Open

Offset adjust in LSBs from +31 to −32

(twos complement format)

0x00

0x14

Output

mode

Open

Output

disable

(local)

Open

Output invert (local)

1 = normal (default)

0 = inverted

Output format

00 = offset

binary

01 = twos

complement

(default)

10 = gray code

11 = reserved

(local)

0x05

Configures the

outputs and

the format of the

data

0x15

Output

adjust

(global)

Open

LVDS output drive current adjust

0000 = 3.72 mA output drive current

0001 = 3.5 mA output drive current (default)

0010 = 3.30 mA output drive current

0011 = 2.96 mA output drive current

0100 = 2.82 mA output drive current

0101 = 2.57 mA output drive current

0110 = 2.27 mA output drive current

0111 = 2.0 mA output drive current

(reduced range)

1000 to 1111 = reserved

0x01

0x16

Clock phase

control

(global)

Invert DCO

clock

Open

0x00

0x17

DCO output

delay

(global)

Enable DCO

clock delay

Open

DCO clock delay

[delay = (3100 ps × register value/31 +100)]

00000 = 100 ps

00001 = 200 ps

00010 = 300 ps

…

11110 = 3100 ps

11111 = 3200 ps

0x00

0x18

Input span

select

(global)

Open

Full-scale input voltage selection

01111 = 2.087 V p-p

…

00001 = 1.772 V p-p

00000 = 1.75 V p-p (default)

11111 = 1.727 V p-p

…

10000 = 1.383 V p-p

0x00

Full-scale input

adjustment in

0.022 V steps

0x19

User Test

Pattern 1 LSB

(global)

User Test Pattern 1[7:0]

0x00

0x1A

User Test

Pattern 1

MSB (global)

User Test Pattern 1[15:8]

0x00

0x1B

User Test

Pattern 2 LSB

(global)

User Test Pattern 2[7:0]

0x00

0x1C

User Test

Pattern 2

MSB (global)

User Test Pattern 2[15:8]

0x00

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