AD6657ABBCZ datasheet(32/36 Pages) AD

32 / 36 page

AD6657A

Data Sheet

Rev. 0 | Page 32 of 36

Addr.

(Hex)

Name

(MSB)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

(LSB)

Bit 0

Default

Value

(Hex)

Comments

0x0D

Test mode

(local)

Open

Reset

long PN

generator

0 = on

1 = off

(default)

Reset

short PN

generator

0 = on

1 = off

(default)

Open

Output test mode

000 = off (normal operation)

001 = midscale short

010 = positive FS

011 = negative FS

100 = alternating checkerboard

101 = PN sequence long

110 = PN sequence short

111 = 1/0 word toggle

0x00

When set,

the test data

is placed on

the output

pins in place

of normal

data.

0x0E

BIST enable

(local)

Open

BIST reset

0 = on

1 = off

(default)

Open

BIST

enable

1 = on

0 = off

(default)

0x00

When Bit 0

is set, the

built-in self

test function

is initiated.

0x10

Offset adjust

(local)

Open

Offset adjustment in LSBs from +127 to −128

(twos complement format)

011111 = +31 LSB

011110 = +30 LSB

011101 = +29 LSB

…

000010 = +2 LSB

000001 = +1 LSB

000000 = 0 LSB

…

111111 = −1 LSB

111110 = −2 LSB

111101 = −3 LSB

…

100001 = −31 LSB

100000 = −32 LSB

0x00

Device offset

trim.

0x14

Output mode

(local)

Open

Output

enable

bar

(local)

1 = off

0 = on

Open

Output

invert

(local)

1 = on

0 = off

Output format (local)

00 = offset binary

01 = twos

complement

0x00

Configures

the outputs

and the

format of

the data.

0x15

Output

adjust

(local)

Open

Output port LVDS drive current

0000 = 3.72 mA

0001 = 3.5 mA (default)

0010 = 3.3 mA

0011 = 2.96 mA

0100 = 2.82 mA

0101 = 2.57 mA

0110 = 2.27 mA

0111 = 2.0 mA

1000 = 2.0 mA

0x01

Output

current

adjustments.

0x16

Clock phase

control

(local)

Invert

DCO clock

0 = off

1 = on

Open

0x00

When Bit 7

is set, clock

polarity is

reversed.

0x17

DCO output

delay

(local)

DCO

delay

enable

0 = off

1 = on

Open

Output port DCO clock delay

00000 = 100 ps additional delay on the DCO pin

00001 = 200 ps additional delay on the DCO pin

00010 = 300 ps additional delay on the DCO pin

…

11101 = 3.0 ns additional delay on the DCO pin

11110 = 3.1 ns additional delay on the DCO pin

11111 = 3.2 ns additional delay on the DCO pin

0x00

Enable DCO

delay and set

the delay

time.

0x18

VREF select

(global)

Open

Internal VREF full-scale adjustment

Main reference full-scale VREF adjustment

01111: internal 2.087 V p-p

…

00001: internal 1.772 V p-p

00000: internal 1.75 V p-p

…

11111: internal 1.727 V p-p

…

10000: internal 1.383 V p-p

0x00

Select

adjustments

for VREF.

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