Datasheet
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