AD9689 datasheet(114/134 Pages) AD

114 / 134 page

AD9689

Data Sheet

Rev. A | Page 114 of 134

Addr.

Name

Bit(s) Bit Name

Setting

Description

Reset

Access

DDC3 Q input select

0x1

R/W

Channel A.

Channel B.

Reserved

Reserved.

0x0

DDC3 I input select

0x1

R/W

Channel A.

Channel B.

0x0374 DDC3 NCO

control

[7:4] DDC3 NCO channel

select mode

For edge control, the internal counter wraps when the

0x0

R/W

0000

Use Register 0x0374, Bits[3:0].

0001

GPIO_B0, GPIO_A0.

0010

GPIO_B1, GPIO_A1.

0011

GPIO_A1, GPIO_A0.

0100

GPIO_B1, GPIO_B0.

0101

GPIO_B1, GPIO_A1, GPIO_B0, GPIO_A0.

0110

GPIO_B1, GPIO_B0, GPIO_A1, GPIO_A0.

1000

Increment internal counter when rising edge of GPIO_A0 pin.

1001

Increment internal counter when rising edge of GPIO_A1 pin.

1010

Increment internal counter when rising edge of GPIO_B0 pin.

1011

Increment internal counter when rising edge of GPIO_B1 pin.

[3:0] DDC3 NCO register

map channel select

NCO channel select register map control.

0x0

R/W

0000

Select NCO Channel 0.

0001

Select NCO Channel 1.

0010

Select NCO Channel 2.

0011

Select NCO Channel 3.

0100

Select NCO Channel 4.

0101

Select NCO Channel 5.

0110

Select NCO Channel 6.

0111

Select NCO Channel 7.

1000

Select NCO Channel 8.

1001

Select NCO Channel 9.

1010

Select NCO Channel 10.

1011

Select NCO Channel 11.

1100

Select NCO Channel 12.

1101

Select NCO Channel 13.

1110

Select NCO Channel 14.

1111

Select NCO Channel 15.

0x0375 DDC3 phase

control

[7:4] Reserved

Reserved.

0x0

[3:0] DDC3 phase update

index

Indexes the NCO channel whose phase and offset gets updated.

The update method is based on the DDC phase update mode,

which can be continuous or require chip transfer.

0x0

R/W

0000

Update NCO Channel 0.

0001

Update NCO Channel 1.

0010

Update NCO Channel 2.

0011

Update NCO Channel 3.

0x0376 DDC3 Phase

Increment 0

[7:0] DDC3 phase

increment[7:0]

FTW. Twos complement phase increment value for the NCO.

Complex mixing frequency = (DDC phase increment × fS)/248.

0x0

R/W

0x0377 DDC3 Phase

Increment 1

[7:0] DDC3 phase

increment[15:8]

FTW. Twos complement phase increment value for the NCO.

Complex mixing frequency = (DDC phase increment × fS)/248

0x0

R/W

0x0378 DDC3 Phase

Increment 2

[7:0] DDC3 phase

increment[23:16]

FTW. Twos complement phase increment value for the NCO.

Complex mixing frequency = (DDC phase increment × fS)/248.

0x0

R/W

0x0379 DDC3 Phase

Increment 3

[7:0] DDC3 phase

increment[31:24]

FTW. Twos complement phase increment value for the NCO.

Complex mixing frequency = (DDC phase increment × fS)/248.

0x0

R/W

0x037A DDC3 Phase

Increment 4

[7:0] DDC3 phase

increment[39:32]

FTW. Twos complement phase increment value for the NCO.

Complex mixing frequency = (DDC phase increment × fS)/248.

0x0

R/W

0x037B DDC3 Phase

Increment 5

[7:0] DDC3 phase

increment[47:40]

FTW. Twos complement phase increment value for the NCO.

Complex mixing frequency = (DDC phase increment × fS)/248.

0x0

R/W

0x037D DDC3 Phase

Offset 0

[7:0] DDC3 phase

offset[7:0]

Twos complement POW for the NCO.

0x0

R/W

AD9689 Datasheet(PDF) 114 Page - Analog Devices

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