
Data Sheet
AD9558
Rev. B | Page 65 of 104
Reg
Addr
(Hex)
Opt
Name
D7
D6
D5
D4
D3
D2
D1
D0
Def
Reference Inputs
0x0600
Reference
power-down
Reserved
Reference power-down[3:0]
00
0x0601
Reference
logic type
REFD logic type[1:0]
REFC logic type[1:0]
REFB logic type[1:0]
REFA logic type[1:0]
00
0x0602
Reference
priority
REFD priority[1:0]
REFC priority[1:0]
REFB priority[1:0]
REFA priority[1:0]
00
0x0603
Reserved
00
Frame Synchronization Mode
0x0640
En frame sync
Reserved
Enable Fsync
00
0x0641
Frame sync
options
Reserved
Validate
Fsync ref
Fsync one
shot
Fsync
arm
method
Arm soft Fsync
00
Profile A (for REFA)
0x0700
L
Reference
period (up to
1.1 ms)
Nominal reference period (fs), Bits[7:0] (default: 51.44 ns =1/(19.44 MHz) for default system clock setting)
C9
0x0701
L
Nominal period (fs), Bits[15:8]
EA
0x0702
L
Nominal period (fs), Bits[23:16]
10
0x0703
L
Nominal period (fs), Bits[31:24]
03
0x0704
L
Nominal period (fs), Bits[39:32]
00
0x0705
L
Frequency
tolerance
Inner tolerance (1 ppm), Bits[7:0] (for reference invalid to valid; 50% down to 1 ppm) (default: 5%)
14
0x0706
L
Inner tolerance (1 ppm), Bits[15:8] (for reference invalid to valid; 50% down to 1 ppm)
00
0x0707
L
Reserved
Inner tolerance, Bits[19:16]
00
0x0708
L
Outer tolerance (1 ppm), Bits[7:0] (for reference valid to invalid; 50% down to 1 ppm) (default: 10%)
0A
0x0709
L
Outer tolerance (1 ppm), Bits[15:8] (for reference valid to invalid; 50% down to 1 ppm)
00
0x070A
L
Reserved
Outer tolerance, Bits[19:16]
00
0x070B
L
Validation
Validation timer (ms), Bits[7:0] (up to 65.5 seconds)
0A
0x070C
L
Validation timer (ms), Bits[15:8] (up to 65.5 seconds)
00
0x070D
L
Reserved
00
0x070E
L
Select base
loop filter
Reserved
Sel high PM
base loop
filter
00
0x070F
L
DPLL loop BW
Digital PLL loop BW scaling factor[7:0] (default: 0x01F4 = 50 Hz)
F4
0x0710
L
Digital PLL loop BW scaling factor[15:8]
01
0x0711
L
Reserved
BW scaling
factor[16]
00
0x0712
L
DPLL
R divider
(20 bits)
R divider[7:0]
C5
0x0713
L
R divider[15:8]
00
0x0714
L
Reserved
Enable REFA
divide-by-2
R divider[19:16]
00
0x0715
DPLL
N divider
(17 bits)
Digital PLL feedback divider—Integer Part N1[7:0]
6B
0x0716
Digital PLL feedback divider—Integer Part N1[15:8]
07
0x0717
Reserved
Digital PLL
feedback
divider—
Integer Part
N1[16]
00
0x0718
DPLL
fractional
feedback
divider
(24 bits)
Digital PLL fractional feedback divider—FRAC1[7:0]
04
0x0719
Digital PLL fractional feedback divider—FRAC1[15:8]
00
0x071A
Digital PLL fractional feedback divider—FRAC1[23:16]
00
0x071B
DPLL
fractional
feedback
divider
modulus
(24 bits)
Digital PLL feedback divider modulus—MOD1[7:0]
05
0x071C
Digital PLL feedback divider modulus—MOD1[15:8]
00
0x071D
Digital PLL feedback divider modulus—MOD1[23:16]
00
0x071E
L
Lock detectors
Phase lock threshold (ps), Bits[7:0]
BC
0x071F
L
Phase lock threshold (ps), Bits[15:8]
02
0x0720
L
Phase lock fill rate[7:0]
0A
0x0721
L
Phase lock drain rate[7:0]
0A
0x0722
L
Frequency lock threshold[7:0]
BC
0x0723
L
Frequency lock threshold[15:8]
02
0x0724
L
Frequency lock threshold[23:16]
00
0x0725
L
Frequency lock fill rate[7:0]
0A
0x0726
L
Frequency lock drain rate[7:0]
0A