Datasheet

AD9547 Data Sheet
Rev. E | Page 8 of 104
REFERENCE SWITCHOVER SPECIFICATIONS
Table 10.
Parameter
Min
Typ
Max
Unit
Test Conditions/Comments
MAXIMUM OUTPUT PHASE
PERTURBATION (PHASE BUILD-OUT
SWITCHOVER)
40
200
ps
Assumes a jitter-free reference; satisfies
Tel cordia GR-1244-CORE requirements
MAXIMUM TIME/TIME SLOPE
(HITLESS SWITCHOVER)
315
65,535
ns/sec
Minimum/maximum values are program-
mable upper bounds; a minimum value
ensures <10% error; satisfies Telcordia
GR-1244-CORE requirements
TIME REQUIRED TO SWITCH TO A NEW
REFERENCE
Hitless Switchover 5 NPDP NPDP = nominal phase detector period
(NPDP = f
REF
/R)
1
Phase Build-Out Switchover 3 NPDP NPDP = nominal phase detector period
(NPDP = f
REF
/R)
1
1
f
REF
is the frequency of the active reference; R is the frequency division factor determined by the R divider.
DISTRIBUTION CLOCK OUTPUTS (OUT0, OUT1)
Table 11.
Parameter Min Typ Max Unit Test Conditions/Comments
LVPECL MODE
Using internal current setting resistor
(nominal 3.12 kΩ)
Maximum Output Frequency
725
MHz
Rise/Fall Time
1
(20% to 80%)
180
315
ps
100 Ω termination across output pins
Duty Cycle 45 55 %
Differential Output Voltage Swing 630 770 910 mV Magnitude of voltage across pins; output
driver static
Common-Mode Output Voltage
AVDD3 − 1.5
AVDD3 − 1.3
AVDD3 − 1.05
V
Output driver static
LVDS MODE Using internal current setting resistor
(nominal 3.12 kΩ)
Maximum Output Frequency
725
MHz
Rise/Fall Time
1
(20% to 80%)
200
350
ps
100 Ω termination across the output pins
Duty Cycle
40
60
%
Differential Output Voltage Swing
Balanced (V
OD
)
247
454
mV
Voltage swing between output pins;
output driver static
Unbalanced (ΔV
OD
)
50
mV
Absolute difference between voltage
swing of normal pin and inverted pin;
output driver static
Offset Voltage
Common Mode (V
OS
)
1.125
1.375
V
Output driver static
Common-Mode Difference (ΔV
OS
)
50
mV
Voltage difference between pins; output
driver static
Short-Circuit Output Current
13
24
mA
Output driver static
CMOS MODE
Weak drive option not supported for
operating the CMOS drivers using a 1.8 V
supply
Maximum Output Frequency
3.3 V Supply
10 pF load
Strong Drive Strength Setting
250
MHz
Weak Drive Strength Setting 25 MHz
1.8 V Supply 150 MHz