Data Sheet
AD9554
DISTRIBUTION CLOCK OUTPUTS
Table 8.
Parameter
Min
Typ
Max
Unit
Test Conditions/Comments
14 mA (HCSL-, LVDS-COMPATIBLE) MODE
Unless otherwise stated, specifications dc-
coupled with no output termination resistor;
when ac-coupled, LVDS-compatible amplitudes are
achieved with a 100 Ω resistor across the output
pair; HCSL-compatible amplitudes achieved with
no termination resistor across the output pair;
output current setting: 14 mA
Output Frequency
0.430
0.430
941
781
MHz
MHz
Frequency range all four PLLs can generate using
unique VCO frequencies; frequencies outside this
range are possible on some of the PLLs, but can
result in increased VCO coupling due to multiple
PLLs using the same VCO frequency
Continuous Output Frequency Range
Maximum Output Frequency
All four PLLs can generate this range at the same
time while using unique VCO frequencies
PLL0 to PLL3 Using Unique VCO
Frequencies
PLL0, PLL1, and PLL2
941
MHz
MHz
Maximum frequency all four PLLs can generate
using unique VCO frequencies
Limited by 1250 MHz maximum input frequency
to channel divider (Q divider)
1250
PLL3
1187
125
MHz
ps
Limited by 4748 MHz maximum VCO frequency
Rise/Fall Time (20% to 80%)1
Duty Cycle
190
Up to fOUT = 750 MHz
Up to fOUT = 941 MHz
Up to fOUT = 1250 MHz
Differential Output Voltage Swing
45
44
50
50
50
55
56
%
%
%
Differential voltage swing between output pins;
measured with output driver static; peak-to-peak
differential output amplitude 2× this level with
driver toggling; see Figure 11 for output
amplitude vs. output frequency
Without 100 Ω Termination Resistor
With 100 Ω Termination Resistor Across
Outputs
635
294
840
390
1000
463
mV
mV
Common-Mode Output Voltage
Reference Input-to-Output Delay Variation
over Temperature
310
420
600
525
mV
fs/°C
Output driver static; no termination resistor
DPLL locked to same input reference at all times;
stable system clock source (noncrystal)
Static Phase Offset Variation from Active
Reference to Output over Voltage
Extremes
75
fs/mV
21 mA MODE
Unless otherwise stated, specifications
dc-coupled with 50 Ω output termination resistor to
ground; output current setting = 21 mA
Output Frequency
0.430
0.430
941
781
MHz
MHz
Frequency range all four PLLs can generate using
unique VCO frequencies; frequencies outside this
range are possible on some of the PLLs, but can
result in increased VCO coupling due to multiple
PLLs using the same VCO frequency
Continuous Output Frequency Range
Maximum Output Frequency
All four PLLs can generate this range at the same
time while using unique VCO frequencies
PLL0 to PLL3 Using Unique VCO
Frequencies
PLL0, PLL1, and PLL2
941
MHz
MHz
Maximum frequency all four PLLs can generate
using unique VCO frequencies
Limited by 1250 MHz maximum input frequency
to channel divider (Q divider)
1250
PLL3
1187
125
MHz
ps
Limited by 4748 MHz maximum VCO frequency
Rise/Fall Time (20% to 80%)1
190
Rev. D | Page 9 of 116