AD9517-4_15 Datasheet, PDF (6/80 Pages) Analog Devices – 12-Output Clock Generator with Integrated 1.6 GHz VCO

AD9517-4
Data Sheet
CLOCK INPUTS
Table 3.
Parameter
CLOCK INPUTS (CLK, CLK)
Input Frequency
Input Sensitivity, Differential
Min
Typ
0¹
0¹
150
Input Level, Differential
Input Common-Mode Voltage, VCM 1.3
1.57
Input Common-Mode Range, VCMR 1.3
Input Sensitivity, Single-Ended
150
Input Resistance
3.9
4.7
Input Capacitance
2
Max
Unit Test Conditions/Comments
Differential input
2.4
GHz
High frequency distribution (VCO divider)
1.6
GHz
Distribution only (VCO divider bypassed)
mV p-p Measured at 2.4 GHz; jitter performance is improved
with slew rates > 1 V/ns
2
V p-p Larger voltage swings may turn on the protection
diodes and may degrade jitter performance
1.8
V
Self-biased; enables ac coupling
1.8
V
With 200 mV p-p signal applied; dc-coupled
mV p-p CLK ac-coupled; CLK ac-bypassed to RF ground
5.7
kΩ
Self-biased
pF
1 _{Below about 1 MHz, the input should be dc-coupled. Care should be taken to match VCM.}
CLOCK OUTPUTS
Table 4.
Parameter
Min
Typ
LVPECL CLOCK OUTPUTS
OUT0, OUT1, OUT2, OUT3
Output Frequency, Maximum 2950
Max
Unit
MHz
Output High Voltage (VOH)
VS_LVPECL − VS_LVPECL − VS_LVPECL − V
1.12
0.98
0.84
Output Low Voltage (VOL)
VS_LVPECL − VS_LVPECL − VS_LVPECL − V
2.03
1.77
1.49
Output Differential Voltage (VOD) 550
790
980
mV
LVDS CLOCK OUTPUTS
OUT4, OUT5, OUT6, OUT7
Output Frequency
Output Differential Voltage (VOD) 247
360
Delta VOD
Output Offset Voltage (VOS)
Delta VOS
1.125
1.24
Short-Circuit Current (ISA, ISB)
14
800
MHz
454
mV
25
mV
1.375
V
25
mV
24
mA
Test Conditions/Comments
Termination = 50 Ω to VS − 2 V
Differential (OUT, OUT)
Using direct to output; see Figure 25 for peak-to-peak
differential amplitude
This is VOH − VOL 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)
Differential termination 100 Ω at 3.5 mA
Differential (OUT, OUT)
The AD9517 outputs toggle at higher frequencies,
but the output amplitude may not meet the VOD
specification; see Figure 26
VOH − VOL measurement across a differential pair at the
default amplitude setting with output driver not
toggling; see Figure 26 for variation over frequency
This is the absolute value of the difference between
VOD when the normal output is high vs. when the
complementary output is high
(VOH + VOL)/2 across a differential pair
This is the absolute value of the difference between
VOS when the normal output is high vs. when the
complementary output is high
Output shorted to GND
Rev. E | Page 6 of 80