AD9522 Analog Devices, Inc., AD9522 Datasheet - Page 69
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AD9522
Manufacturer Part Number
AD9522
Description
12 Lvds/24 Cmos Output Clock Generator With Integrated 2.8 Ghz Vco
Manufacturer
Analog Devices, Inc.
Datasheet
1.AD9522.pdf
(84 pages)
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Reg.
Addr
(Hex) Bit(s) Name
017
018
018
018
018
018
[1:0] Antibacklash
[7]
[6:5] Lock detect
[4]
[3]
[2:1] VCO calibration
pulse width
Enable CMOS
reference input
dc offset
counter
Digital lock
detect window
Disable digital
lock detect
divider
Description
[7]
1
1
1
1
1
1
1
1
1
1
1
1
[1]
0
0
1
1
Enables dc offset in single-ended CMOS input mode to prevent chattering when ac-coupled and input is lost.
[7] = 0; disable dc offset (default).
[7] = 1; enable dc offset.
Required consecutive number of PFD cycles with edges inside lock detect window before the DLD indicates
a locked condition.
[6]
0
0
1
1
If the time difference of the rising edges at the inputs to the PFD are less than the lock detect window time,
the digital lock detect flag is set. The flag remains set until the time difference is greater than the loss-of-lock
threshold.
[4] = 0; high range (default).
[4] = 1; low range.
Digital lock detect operation.
[3] = 0; normal lock detect operation (default).
[3] = 1; disable lock detect.
Divider used to generate the VCO calibration clock from the PLL reference clock (see the VCO Calibration section for
the recommended setting of the VCO calibration divider based on the PFD rate).
[2]
0
0
1
1
[6]
1
1
1
1
1
1
1
1
1
1
1
1
[0]
0
1
0
1
[5]
0
1
0
1
[1]
0
1
0
1
[5] [4]
0
0
0
0
1
1
1
1
1
1
1
1
Antibacklash Pulse Width (ns)
2.9 (default)
1.3
6.0
2.9
PFD Cycles to Determine Lock
5 (default)
16
64
255
VCO Calibration Clock Divider
2
4
8
16 (default)
1
1
1
1
0
0
0
0
1
1
1
1
[3]
0
0
1
1
0
0
1
1
0
0
1
1
Rev. 0 | Page 69 of 84
[2]
0
1
0
1
0
1
0
1
0
1
0
1
Level or
Dynamic
Signal
DYN
LVL
LVL
LVL
LVL
LVL
LVL
LVL
LVL
LVL
LVL
LVL
Signal at STATUS Pin
Unselected reference to PLL (not available when in
differential mode).
Status of selected reference (status of differential reference);
active low.
Status of unselected reference (not available in differential
mode); active low.
Status of REF1 frequency (active low).
Status of REF2 frequency (active low).
(Status of REF1 frequency) AND (status of REF2 frequency).
(DLD) AND (Status of selected reference) AND (status of VCO).
Status of VCO frequency (active low).
Selected reference (low = REF2, high = REF1).
DLD (active low).
Holdover active (active low).
LD pin comparator output (active low).
AD9522-0