AD9548(Rev0) Ver la hoja de datos (PDF) - Analog Devices
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AD9548 Datasheet PDF : 112 Pages
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AD9548
REFERENCE SWITCHOVER SPECIFICATIONS
Table 10.
Parameter
Min
Typ
Max
Unit
REFERENCE SWITCHOVER SPECIFICATIONS
Maximum Output Phase Perturbation (Phase
Build-Out Switchover)
40
200
ps
Maximum Time/Time Slope (Hitless
315
Switchover)
65,535 ns/sec
Time Required to Switch to a New Reference
Hitless Switchover
5
sec
Phase Build-Out Switchover
3
sec
1 fREF is the frequency of the active reference; R is the frequency division factor determined by the R-divider.
DISTRIBUTION CLOCK OUTPUTS (OUT0 TO OUT3)
Table 11.
Parameter
Min
Typ
LVPECL MODE
Maximum Output Frequency
725
Rise/Fall Time (20% to 80%)
180
Duty Cycle
45
Differential Output Voltage Swing 630
770
Max
Unit
MHz
315
ps
55
%
910
mV
Common-Mode Output Voltage
LVDS MODE
AVDD3 AVDD3 − 1.3 AVDD3 −
V
− 1.5
1.05
Maximum Output Frequency
725
Rise/Fall Time1 (20% to 80%)
200
Duty Cycle
40
Differential Output Voltage Swing
Balanced, VOD
247
MHz
350
ps
60
%
454
mV
Unbalanced, ΔVOD
50
mV
Offset Voltage
Common-Mode, VOS
Common-Mode Difference, ΔVOS
1.125
Short-Circuit Output Current
13
CMOS MODE
1.375
V
50
mV
24
mA
Maximum Output Frequency
3.3 V Supply
Strong Drive Strength Setting
250
MHz
Weak Drive Strength Setting
25
MHz
1.8 V Supply
150
MHz
Test Conditions/Comments
Assumes a jitter-free reference; satisfies
Telcordia GR-1244-CORE requirements
Minimum/maximum values are
programmable upper bounds; a minimum
value ensures <10% error; satisfies
Telcordia GR-1244-CORE requirements
Calculated using the nominal phase
detector period (NPDP = R/fREF)1
Calculated using the nominal phase
detector period (NPDP = R/fREF)1
Test Conditions/Comments
Using internal current setting resistor
100 Ω termination across output pins
Magnitude of voltage across pins; output
driver static
Output driver static
Using internal current setting resistor
(nominal 3.12 kΩ)
100 Ω termination across the output pair
Voltage swing between output pins;
output driver static
Absolute difference between voltage
swing of normal pin and inverted pin;
output driver static
Output driver static
Voltage difference between pins; output
driver static
Output driver static
Weak drive option not supported for
operating the CMOS drivers using a 1.8 V
supply
10 pF load
Rev. 0 | Page 8 of 112
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