Datasheet

AD9517-1 Data Sheet
Rev. E | Page 6 of 80
CLOCK INPUTS
Table 3.
Parameter Min Typ Max Unit Test Conditions/Comments
CLOCK INPUTS (CLK, CLK)
Differential input
Input Frequency 0
1
2.4 GHz High frequency distribution (VCO divider)
0
1
1.6 GHz Distribution only (VCO divider bypassed)
Input Sensitivity, Differential 150 mV p-p
Measured at 2.4 GHz; jitter performance is improved
with slew rates > 1 V/ns
Input Level, Differential 2 V p-p
Larger voltage swings may turn on the protection
diodes and may degrade jitter performance
Input Common-Mode Voltage, V
CM
1.3 1.57 1.8 V Self-biased; enables ac coupling
Input Common-Mode Range, V
CMR
1.3 1.8 V With 200 mV p-p signal applied; dc-coupled
Input Sensitivity, Single-Ended 150 mV p-p
CLK ac-coupled;
CLK ac-bypassed to RF ground
Input Resistance 3.9 4.7 5.7 kΩ Self-biased
Input Capacitance 2 pF
1
Below about 1 MHz, the input should be dc-coupled. Care should be taken to match V
CM
.
CLOCK OUTPUTS
Table 4.
Parameter Min Typ Max Unit Test Conditions/Comments
LVPECL CLOCK OUTPUTS Termination = 50 Ω to V
S
− 2 V
OUT0, OUT1, OUT2, OUT3
Differential (OUT,
OUT)
Output Frequency, Maximum
2950
MHz
Using direct to output; see Figure 25 for peak-to-peak
differential amplitude
Output High Voltage (V
OH
)
V
S_LVPECL
−
1.12
V
S_LVPECL
−
0.98
V
S_LVPECL
−
0.84
V
Output Low Voltage (V
OL
)
V
S_LVPECL
−
2.03
V
S_LVPECL
−
1.77
V
S_LVPECL
−
1.49
V
Output Differential Voltage (V
OD
) 550 790 980 mV
This is V
OH
− V
OL
for each leg of a differential pair for
default amplitude setting with driver not toggling; the
peak-to-peak amplitude measured using a differential
probe across the differential pair with the driver
toggling is roughly 2× these values (see Figure 25 for
variation over frequency)
LVDS CLOCK OUTPUTS Differential termination 100 Ω at 3.5 mA
OUT4, OUT5, OUT6, OUT7
Differential (OUT,
OUT)
Output Frequency
800
MHz
The AD9517 outputs toggle at higher frequencies,
but the output amplitude may not meet the V
OD
specification; see Figure 26
Output Differential Voltage (V
OD
) 247 360 454 mV
V
OH
− V
OL
measurement across a differential pair at the
default amplitude setting with output driver not
toggling; see Figure 26 for variation over frequency
Delta V
OD
25 mV
This is the absolute value of the difference between
V
OD
when the normal output is high vs. when the
complementary output is high
Output Offset Voltage (V
OS
) 1.125 1.24 1.375 V (V
OH
+ V
OL
)/2 across a differential pair
Delta V
OS
25 mV
This is the absolute value of the difference between V
OS
when the normal output is high vs. when the
complementary output is high
Short-Circuit Current (I
SA
, I
SB
) 14 24 mA Output shorted to GND