AD6677 datasheet(37/48 Pages) AD

37 / 48 page

Data Sheet

AD6677

Rev. C | Page 37 of 48

Reg

Addr

(Hex)

Reg Addr

Name

Bit 7

(MSB)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0 (LSB)

Default

Notes

0x15

CML output

adjust

JESD204B CML differential output drive

level adjustment:

000 = 75% of nominal ( 438 mV p-p),

001 = 83% of nominal (488 mV p-p),

010 = 91% of nominal (538 mV p-p),

011 = nominal (default) (588 mV p-p),

100 = 109% of nominal (638 mV p-p),

101 = 117% of nominal (690 mV p-p),

110 = 126% of nominal (740 mV p-p),

111 = 134% of nominal (790 mV p-p)

0x03

0x18

Input span

select

Main reference full-scale VREF adjustment:

0 1111 = internal 2.087 V p-p,

...

0 0001 = internal 1.772 V p-p,

0 0000 = internal 1.75 V p-p (default),

1 1111 = internal 1.727 V p-p,

…

1 0000 = internal 1.383 V p-p

0x00

0x19

User Test

Pattern 1 LSB

User Test Pattern 1 LSB; use in conjunction with Address 0x0D and Address 0x61

0x1A

User Test

Pattern 1 MSB

User Test Pattern 1 MSB

0x1B

User Test

Pattern 2 LSB

User Test Pattern 2 LSB

0x1C

User Test

Pattern 2 MSB

User Test Pattern 2 MSB

0x1D

User Test

Pattern 3 LSB

User Test Pattern 3 LSB

0x1E

User Test

Pattern 3 MSB

User Test Pattern 3 MSB

0x1F

User Test

Pattern 4 LSB

User Test Pattern 4 LSB

0x20

User Test

Pattern 4 MSB

User Test Pattern 4 MSB

0x21

PLL low

encode

00 = for lane speeds of

>2 Gbps,

01 = for lane speeds of

<2 Gbps

0x00

0x3A

SYNCINB±/

SYSREF±

control

JESD204B

realign

SYNCINB±:

0 = normal

mode,

1 = realigns

lane on

every active

SYNCINB±

JESD204B

realign

SYSREF±:

0 =

normal

mode,

1 =

realigns

lane on

every

active

SYSREF±

mode:

0 =

continuous

reset clock

dividers,

1 = sync on

SYSREF±

rising edge

only

SYSREF±

enable:

0 =

disabled,

1 =

enabled

Note: This

bit self-

clears after

SYSREF if

SYSREF±

mode = 1

Enable

internal

SYSREF±

buffer;

0 = buffer

disabled,

external

SYSREF±

pin ignored;

1 = buffer

enabled,

use external

SYSREF± pin

0x00

0x3C

NSR control

Bandwidth

mode

(NSR):

0 = 22%,

1 = 33%

NSR enable

0x00

0x3E

NSR tuning

word

Noise shaped requantizer tuning word;

selects the center frequency of the noise transfer function (NTF);

57 possible tuning words (TW) exist for 22% mode and 34 possible tuning words (TW)

exist for 33% mode; each step is 0.5% of the ADC sample rate

0x1C

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