AD9684 datasheet(61/65 Pages) AD

61 / 65 page

AD9684

Data Sheet

Reg.

Addr.

(Hex)

Name

Bit 7

(MSB)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0 (LSB)

Default

Notes

0x367

DDC 2

output test

mode

selection

Q output

test mode

enable

0 = disabled

1 = enabled

from Ch. B

I output

test mode

enable

0 =

disabled

1 =

enabled

from Ch. A

0x00

0x370

DDC 3

control

Mixer

select

0 = real

mixer

1 =

complex

mixer

Gain select

0 = 0 dB

gain

1 = 6 dB

gain

IF mode

00 = variable IF mode

(mixers and NCO

enabled)

01 = 0 Hz IF mode (mixer

bypassed, NCO disabled)

10 = fS/4 Hz IF mode (fS/4

downmixing mode)

11 = test mode (mixer

inputs forced to +FS, NCO

enabled)

Complex to

real enable

0 = disabled

1 = enabled

Decimation rate select

(complex to real

disabled)

11 = decimate by 2

00 = decimate by 4

01 = decimate by 8

10 = decimate by 16

(complex to real

enabled)

11 = decimate by 1

00 = decimate by 2

01 = decimate by 4

10 = decimate by 8

0x00

0x371

DDC 3

input

selection

Q input

select

0 = Ch. A

1 = Ch. B

I input

select

0 = Ch. A

1 = Ch. B

0x05

0x374

DDC 3

frequency

LSB

DDC 3 NCO FTW, Bits[7:0] twos complement

0x00

0x375

DDC 3

frequency

MSB

DDC 3 NCO FTW, Bits[11:8] twos complement

0x00

0x380

DDC 3

phase LSB

DDC 3 NCO POW, Bits[7:0] twos complement

0x00

0x381

DDC 3

phase MSB

DDC 3 NCO POW, Bits[11:8] twos complement

0x00

0x387

DDC 3

output test

mode

selection

Q output

test mode

enable

0 = disabled

1 = enabled

from Ch. B

I output

test mode

enable

0 =

disabled

1 =

enabled

from Ch. A

0x00

Digital Outputs and Test Modes

0x550

ADC test

modes

(local)

User

pattern

selection

0 =

continuous

repeat

1 = single

pattern

Reset PN

long gen

0 = long

PN enable

1 = long

PN reset

Reset PN

short gen

0 = short PN

enable

1 = short PN

reset

Test mode selection

0000 = off (normal operation)

0001 = midscale short

0010 = positive full scale

0011 = negative full scale

0100 = alternating checker board

0101 = PN sequence, long

0110 = PN sequence, short

0111 = one/zero word toggle

1000 = the user pattern test mode (used with

Pattern 4 registers)

1111 = ramp output

0x00

0x551

User

Pattern 1

LSB

0x00

Used with

Reg. 0x550

and

Reg. 0x573

0x552

User

Pattern 1

MSB

0x00

Used with

Reg. 0x550

and

Reg. 0x573

Rev. 0 | Page 60 of 64

AD9684 Datasheet(PDF) 61 Page - Analog Devices

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