Datasheet

AD9549
Rev. D | Page 50 of 76
Addr
(Hex) Type
1
Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 BIt 2 Bit 1 Bit 0
Default
(Hex)
0x01A6 M FTW0
(open-loop
frequency
tuning
word)
FTW0, Bits[47:0]
LSB: Register 0x01A6
0x00
0x01A7 M 0x00
0x01A8 M 0x00
0x01A9 M 0x00
0x01AA M Startup
cond.
0x01AB M Startup
cond.
0x01AC
and
0x01AD
M Phase
(open loop
only)
DDS phase word, Bits[15:0] 0x00
Reference selector/holdover
0x01C0 M Automatic
control
Holdover
mode
Reserved Automatic
selector
Automatic
recover
Automatic
holdover
0x00
0x01C1 M Override Enable
line card
mode
Enable
ref input
override
REF_AB Enable
holdover
override
Holdover
on/off
0x00
0x01C2 Averaging
window
FTW windowed average size, Bits[3:0] 0x00
0x01C3 Reference
validation
Reserved Validation timer, Bits[4:0] 0x00
Doubler and output drivers
0x0200 HSTL
driver
OPOL
(polarity)
Reserved HSTL output doubler,
Bits[1:0]
0x05
0x0201 CMOS
driver
CMOS mux 0x00
Monitor
0x0300 RO Status Reserved PFD freq.
too high
PFD freq.
too low
Freq. est.
done
Ref
selected
Free run Ph. lock
detected
Freq. lock
detected
N/A
0x0301 RO Reserved REFA
valid
REFA
LOR
REFA OOL REFB valid REFB LOR REFB OOL N/A
0x0302 RO IRQ status PFD freq.
too high
PFD
freq. too
low
Freq. est.
done
Ref
selected
Free run Phase lock
detected
Freq. lock
detected
0x00
0x0303 RO REFA
valid
REFA
LOR
REFA OOL REFB valid REFB LOR REFB OOL 0x00
0x0304 IRQ mask Reserved Ref
changed
Leave
free run
Enter
free run
0x00
0x0305 Freq. est.
done
Phase
unlock
Phase lock
Freq.
Unlock
Freq. lock 0x00
0x0306 Reserved REFA
valid
!REFA
valid
REFA
LOR
!REFA LOR
REFA OOL !REFA OOL 0x00
0x0307 Reserved REFB
valid
!REFB
valid
REFB
LOR
!REFB LOR
REFB OOL !REFB OOL 0x00
0x0308 S1 pin
config
REF? REF? LOR REF?
OOL
REF? not
valid
Phase
lock
Freq. lock Reserved IRQ 0x60
0x0309 S2 pin
config
REF? REF? LOR REF?
OOL
REF? not
valid
Phase
lock
Freq. lock Reserved IRQ 0xE0
0x030A S3 pin
config
REF? REF? LOR REF?
OOL
REF? not
valid
Phase
lock
Freq. lock Reserved IRQ 0x08
0x030B S4 pin
config
REF? REF? LOR REF?
OOL
REF? not
valid
Phase
lock
Freq. lock Reserved IRQ 0x01
0x030C Control Enable
REFA LOR
Enable
REFA OOL
Enable
REFB
LOR
Enable
REFB OOL
Enable
phase
lock det.
Enable
frequency
lock det.
0xA2