AD9858

Rev. C | Page 22 of 32

REGISTER MAP

The registers are listed in Table 6. The serial address and parallel address numbers associated with each of the registers are shown in

hexadecimal format. Square brackets [] are used to reference specific bits or ranges of bits. For example, [3] designates Bit 3, and [7:3]

designates the range of bits from 7 down to 3, inclusive.

Table 6.

Register

Address

(MSB)

(LSB)

Default

Name

Ser

Par

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Value

Profile

Control

function

register

(CFR)

0x00

0x00

[7:0]

Not

used

2 GHz

divider

disable

SYNCLK

disable

Mixer

power-

down

Phase

detect

power-

down

Power-

down

SDIO

input

only

LSB first

0x18

N/A

0x01

[15:8]

Freq.

sweep

enable

Enable

sine

output

Charge

pump

offset

Phase detector

divider ratio (N)

(see Table 10)

Charge

pump

polarity

Phase detector

divider ratio (M)

(see Table 11)

0x00

N/A

0x02

[23:16]

Auto Clr

freq.

accum

Auto Clr

phase

accum

Load

delta

freq

timer

Clear

freq

accum

Clear

phase

accum

Not

used

Fast

lock

enable

FTW for

fast lock

0x00

N/A

0x03

[31:24]

Frequency detect

mode charge

pump current

(see Table 7)

Final closed-loop

mode charge pump current

(see Table 8)

Wide closed-loop mode

charge pump current

(see Table 9)

0x00

N/A

Delta freq.

tuning

word

(DFTW)

0x01

0x04

Delta Frequency Word[7:0]

N/A

0x05

Delta Frequency Word[15:8]

N/A

0x06

Delta Frequency Word[23:16]

N/A

0x07

Delta Frequency Word[31:24]

N/A

Delta

frequency

ramp rate

(DFRRW)

0x02

0x08

Delta Frequency Ramp Rate Word[7:0]

N/A

0x09

Delta Frequency Ramp Rate Word[15:8]

N/A

Frequency

Tuning

Word 0

(FTW0)

0x03

0x0A

Frequency Tuning Word 0[7:0]

0x00

0

0x0B

Frequency Tuning Word 0[15:8]

0x00

0

0x0C

Frequency Tuning Word 0[23:16]

0x00

0

0x0D

Frequency Tuning Word 0[31:24]

0x00

0

Phase

Offset

Word 0

(POW0)

0x04

0x0E

Phase Offset Word 0[7:0]

0x00

0

0x0F

Not used

Phase Offset Word 0[13:8]

0x00

0

Frequency

Tuning

Word 1

(FTW1)

0x05

0x10

Frequency Tuning Word 1[7:0]

1

0x11

Frequency Tuning Word 1[15:8]

1

0x12

Frequency Tuning Word 1[23:16]

1

0x13

Frequency Tuning Word 1[31:24]

1

Phase

Offset

Word 1

(POW1)

0x06

0x14

Phase Offset Word 1[7:0]

1

0x15

Not used

Phase Offset Word 1[13:8]

1

Frequency

Tuning

Word 2

(FTW2)

0x07

0x16

Frequency Tuning Word 2[7:0]

2

0x17

Frequency Tuning Word 2[15:8]

2

0x18

Frequency Tuning Word 2[23:16]

2

0x19

Frequency Tuning Word 2[31:24]

2